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Block Transfer

Chapter 10

1012

The purpose of block transfer data buffering is to allow the data to be
validated before it can be used. Data that is read from the block transfer
module and transferred to data table locations must be buffered. Data that
is written to the module need not be buffered because block transfer
modules perform this function internally.

Transferred data is buffered to ensure that both the transfer and the data are
valid. As an example, readings from an open-circuited temperature sensor
(invalid data) could have a valid transfer from an analog input module to
the data table. The processor examines data-valid and/or diagnostic bits
contained in the transferred data to determine whether or not the data is
valid. The block transfer done bit is set if the transfer is valid.

The data-valid and/or diagnostic bits differ for each block transfer module.
Some modules set one or both for the entire file of words transferred, while
others set a data-valid diagnostic bit in each word. Refer to the respective
user’s manual for the block transfer module to determine the correct usage
of the diagnostic and/or data valid bit(s).

One technique of buffering data is to store the transferred data in a
temporary buffer file. If the data in the buffer is valid, it is immediately
transferred to another file in the data table where it can be used. If invalid,
it is not transferred but written over in the next transfer.

Another technique uses only one file. The technique prevents invalid data
from being operated upon by preconditioning the rungs that would transfer
data out of a file one word at a time. Diagnostic and/or data-valid bits are
examined in these rungs.

Data can be moved from the buffer word-by-word using Get/Put transfers,
or the entire file can be moved at once using a FILE-TO-FILE MOVE
instruction. The choice depends on the kinds of diagnostic and/or
data-valid bits and the objectives of the user program. Generally, when one
diagnostic bit is contained in each word, a Get/Put transfer is used. When
one is set for the entire file, a FILE-TO-FILE MOVE instruction is used. In
either case, the diagnostic bits are examined as conditions for enabling the
file move or word transfer.

The example in Figure 10.7 shows the memory map and ladder diagram
rungs for buffering 3 words of data that are read from the block transfer
module. The data is read and buffered in the following sequence:

1. When rung 3 goes true, bit 014/07 (the block transfer enable bit) will

be turned on and block transfer will be requested. This latches on
storage bit 010/00 in rung 4.

10.8
Buffering Data

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Содержание PLC-2/30

Страница 1: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

Страница 2: ...PLC 2 30 Programmable Controller Programming and Operations Manual Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg com...

Страница 3: ...ability for actual use based upon the illustrative uses and applications No patent liability is assumed by Allen Bradley Company Inc with respect to use of information circuits equipment or software d...

Страница 4: ...7 Industrial Terminal 2 7 2 8 Local System Structure 2 7 2 9 Remote System Structure 2 8 2 10 Local Remote System Structure 2 9 2 11 Hardware Addressing Modes 2 10 2 12 Auxiliary Power Supplies 2 10 2...

Страница 5: ...3 4 Ending a Program 4 12 4 3 5 Programming Relay Type Instructions 4 13 4 4 Operating Instructions 4 14 4 4 1 Addressing 4 15 4 4 2 Help Directories 4 15 4 4 3 Searching 4 16 4 4 4 Editing 4 19 4 4 5...

Страница 6: ...and Equ Instructions 6 4 6 2 2 Get Byte and Limit Test Instructions 6 7 6 2 3 Get Byte Put Instruction 6 8 6 3 Programming Data Manipulation Instructions 6 9 6 4 Arithmetic Instructions 6 11 6 4 1 Add...

Страница 7: ...ridge Tape 8 7 8 4 3 Data Cartridge Verification 8 8 8 5 Ladder Diagram Dump 8 8 8 6 Total Memory Dump 8 8 Report Generation 9 1 9 0 General 9 1 9 1 Report Generation Commands 9 3 9 1 1 Message Contro...

Страница 8: ...outine Instructions 11 3 11 1 2 Multiple Jumps to the Same Label 11 3 11 2 Label Instruction 11 6 11 3 Jump to Subroutine Instruction 11 7 11 3 1 Subroutine Area 11 10 11 3 2 Nested Subroutines 11 11...

Страница 9: ...ramming Examine Off Shift Bit Instruction 14 6 14 4 Examine On Shift Bit 14 8 14 4 1 Programming Examine On Shift Bit Instruction 14 8 14 5 Set Shift Bit 14 9 14 5 1 Programming Set Shift Bit Instruct...

Страница 10: ...17 0 General 17 1 17 1 File Search 17 1 17 2 File Diagnostics 17 4 Troubleshooting Aids 18 1 18 0 General 18 1 18 1 Bit Manipulation and Monitor 18 2 18 1 1 Bit Manipulation 18 2 18 1 2 Bit Monitor 1...

Страница 11: ...exadecimal Numbering System B 6 Programming 01 Second Timers C 1 C 0 Introduction C 1 C 1 Time Base Selection C 1 C 2 Timer Accuracy C 2 C 3 10 Msec Timers Typical Applications C 4 C 4 Hardware Proces...

Страница 12: ...is your entry into understanding the PLC 2 30 programmable controller To find what the topics are in the individual chapters Use the Table of Contents To get an overview of what that chapter presents...

Страница 13: ...program operation the PLC 2 30 processor continuously monitors the status of input devices and based on user program instructions either energizes or de energizes output devices Because the memory is...

Страница 14: ...ents From word address 4008 on the data table must be expanded in 128 word sections The I O image tables therefore can be configured in size from 1 to 7 I O racks Each rack added above one increments...

Страница 15: ...KP2 1779 KP2R PLC 2 30 RS 232 1771 KG 1771 KGM 1771 KH Data Highway Non A B1 1771 KE 1771 KF 1770 KF2 Data Highway Fisher Provox 1771 KX1 Data Highway II Non A B1 1779 KFL 1779 KFM 1 Non Allen Bradley...

Страница 16: ...ictable machine motion with possible damage to equipment and or injury to personnel Figure 1 1 ERR Message for Invalid Display of Processor Memory 113 14 1025 16 11314 02516 1770 T3 Display Actual con...

Страница 17: ...Rack Fault 1 The condition that occurs because of a loss of communication between the processor and remote I O chassis 2 any diagnostic indicator that lights up to signal a rack fault Slot 1 The phys...

Страница 18: ...ocessor in the test mode The user program is tested under simulated operating conditions without actually energizing any output devices All outputs are disabled in this switch position RUN This switch...

Страница 19: ...s removed from a 1772 LH processor interface module data table values can be changed between word addresses 0108 and 3778 These values can be changed only when the processor is in the program mode or...

Страница 20: ...is defined as illegal such as jump to a label that is not located closer to the end of program i e a jump backwards These errors become apparent only while the program is being executed so are termed...

Страница 21: ...LT Illuminates when an error in the parity of data retrieved from memory is detected Changing the mode select switch to the PROG position or cycling line power may clear this fault condition Reloading...

Страница 22: ...a power lock momentary or otherwise processors in the RUN or TEST mode attempt to read the local racks before the power supplies are ready This leads to a processor fault The fault may be identified b...

Страница 23: ...perly set Refer to publications 1772 2 18 and 1771 6 5 37 respectively for information on their switch settings WARNING Switch No 1 of the 1771 I O chassis should be set to OFF for most applications T...

Страница 24: ...on about the 1770 T3 Industrial Terminal refer to the Industrial Terminal System User s Manual publication no 1770 6 5 3 For detailed information about the 1784 T50 Industrial Terminal refer to the In...

Страница 25: ...e system allows the processor and the I O chassis to be separated by up to 10 000 cable feet approx 3 048 meters Up to 7 remote I O racks may be assigned Proper transmission of data between the PLC 2...

Страница 26: ...off NOTE For a full listing of the possible combinations of these indicators on off or blinking see the 1771 ASB User s manual publication no 1771 6 5 37 A local remote system has both nearby 3 6 cab...

Страница 27: ...module can be addressed in either 2 slot 1 slot or 1 2 slot modes NOTE Processor to I O chassis communication requires the setting of I O chassis backplane switches See the 1771 ASB Remote I O Adapter...

Страница 28: ...1 Series B I O chassis Full specifications are in publication no 1771 2 111 The 1771 P7 power supply provides 16 amperes to power one bulletin 1771 I O chassis This includes the adapter and the I O mo...

Страница 29: ...0 1 1 0 0 0 1 0 0 1 0 1 1 0 1 1 1 0 0 1 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 1 0 0 1 0 1 0 1 1 0 0 0 1 0 0 0 0 1 1 1 1 0 0 0 1 0 0 1 0 0 0 0 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00...

Страница 30: ...ord address and are divided into three major areas Figure 3 2 Data table User program Main Program Subroutine Area Message Storage Area All input output status and user program instructions are stored...

Страница 31: ...icate remote rack fault status in a remote I O system Do not put input modules in rack 2 I O groups 5 or 6 3 Report generation messages can be stored in memory locations not used by data table or user...

Страница 32: ...modules cannot store information They contain interface circuits only Input output status information on off is actually stored in memory areas called I O image tables An image is defined as an exact...

Страница 33: ...le therefore contains 16 word addresses or 256 bit addresses Using the industrial terminal the output image table can be reduced to 8 word addresses 128 bit addresses or increased from 16 word address...

Страница 34: ...memory is cleared to off These bits are monitored by instructions in the user program Input image table bits are updated each scan cycle to correspond to the information supplied by input modules The...

Страница 35: ...1258 and 1268 may be used to store remote I O fault bits If this is the case input modules must not be placed in these slots rack 2 I O groups 5 and 6 unexpected machine operation may result Artisan T...

Страница 36: ...es in rack 2 I O group 7 2 These words are used to indicate remote rack fault status in a remote I O system Do not put input modules in rack 2 I O groups 5 or 6 Default Configured Data Table 128 Words...

Страница 37: ...in an I O rack slot If it does the terminal address is the same as the bit address The correspondence between the two is illustrated in Figure 3 4 CAUTION Bit and or word storage is not possible in th...

Страница 38: ...orage Bit 010 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Input Image Word Assigned to an Input Module Terminal 010 Word Address Terminal Input Rack Address Module Group 32 I O 1771 A1B 64 I O 177...

Страница 39: ...data table Determining the number of words needed and assigning addresses is a procedure that requires care and attention to detail The data table should be roughed out in advance but formally develo...

Страница 40: ...ory layout display 1 Requires Series B Revision F or later keyboard Data Table Area Configuration The data table is factory configured for 128 words Figure 3 2 The data table size can be decreased to...

Страница 41: ...equencer tables The calculation is made using the following formula ET T C IS 2 where ET number of equivalent timers and counters T number of timers C number of counters IS number of internal storage...

Страница 42: ...ade available for user program instructions Reductions can be made in decrements as small as two words one timer counter If the memory locations are occupied the attempted reduction fails You can incr...

Страница 43: ...racks accumulated address limits become 0608 to 0778 and the preset address limits become 1608 to 1778 when you increase the I O to 768 6 racks accumulated address limits are 0708 to 0778 and preset...

Страница 44: ...as Examine On use one word of memory Others such as file instructions are more complex and can use two or more words of user program memory As the user program is entered from the industrial terminal...

Страница 45: ...and all the bits in the upper byte of the message control words may be used for automatic report generation functions Since the user program examines these bits to determine report generation status a...

Страница 46: ...logical address of a single 16 bit input or output image table word The remaining two digits represent a specific bit in that I O table word Figure 3 6 shows how the 5 digit address corresponds to an...

Страница 47: ...rminology Input 1 or Output 0 Rack No 1 7 I O Group No 0 7 Terminal No 00 07 10 17 Word Address Bit Address Data Table Terminology Instruction Address Output 0 Rack No 1 Word Address Bit Address I O G...

Страница 48: ...12 11 10 07 06 05 04 03 02 01 00 Bit Terminal Outout 0 Input 1 Rack Number Module Group 32 I O 64 I O 96 I O 128 I O Rack 1 I O Group 1 0 1 2 3 4 5 6 7 Word Address 010 Upper Byte Lower Byte Left Slot...

Страница 49: ...r examines bit 113 12 for an On 1 condition If the bit is On 1 the Examine On instruction is logically true A true condition is displayed as an intensified instruction A path of logic continuity is es...

Страница 50: ...0 OFF 012 Closed Input 0178 1138 1108 1778 06 12 113 Instruction Intensified When Enabled When the input device wired to terminal 113 12 opens the input module senses no voltage The Off condition is...

Страница 51: ...s form can be used to map the addresses of group data table words and to concisely describe the function of each group The groups can include I O Image Tables Block Transfer Timer Counter File and Seq...

Страница 52: ...storage bits The lower two digits of the 3 4 or 5 digit word address are prenumbered in the left hand column The bit numbers 00 17 complete the 5 6 or 7 digit bit address The starting word address can...

Страница 53: ...e words can be numbered consecutively through the entire 64 words Or the right hand column can be numbered 1008 greater than the left hand column to conveniently track accumulated and preset values In...

Страница 54: ...ge bits having the same I O group number The bit numbers are prenumbered 00 17 For example a portion of the data table bit assignment sheet is shown in Figure 3 11 It illustrates logging the input dev...

Страница 55: ...tten in the left hand blank column The from to addresses at the bottom of the sheet are the starting and ending file addresses for each column of the sequencer tables For example Figure 3 12 shows a c...

Страница 56: ...he controller The 5 digit bit address directly corresponds to the location of each I O device with respect to the rack number I O group and terminal number Because the bit address is hardware related...

Страница 57: ...C address pair as its data address The first available location must be reserved for block transfer Chapter 10 Table 3 B Timer Counter Address for 1772 LP3 I O Racks First Timer Counter Word Address 1...

Страница 58: ...iately below the last timer counter preset address Files can include their own unique addresses as well as duplicate preassigned addresses Therefore files should be carefully entered on data table doc...

Страница 59: ...3 3 31 ALLEN BRADLEY Connection Diagram Addressing BULLETIN 1771 I O Chassis PROJECT NAME PAGE DATE DESIGNER OF 8 point Modules Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURC...

Страница 60: ...3 3 32 Bulletin 1771 I O Chassis CONNECTION DIAGRAM ADDRESSING WORKSHEET 16 point Modules PROJECT NAME PAGE DATE DESIGNER OF Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE...

Страница 61: ...S WORD ADDRESS REF 000 040 100 140 200 240 300 340 400 440 500 540 600 640 700 740 037 077 137 177 237 277 337 377 437 477 537 577 637 677 737 777 ADDRESS TO 000 040 100 140 200 240 300 340 400 440 50...

Страница 62: ...40 41 42 43 44 45 46 47 50 51 52 53 54 55 56 57 60 61 62 63 64 65 66 67 70 71 72 73 74 75 76 77 DESCRIPTION BIT NUMBER 17 10 07 00 STARTING WORD ADDRESS 00 01 02 03 04 05 06 07 10 11 12 13 14 15 16 17...

Страница 63: ...E PROCESSOR DATA TABLE SIZE DESIGNER 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 WORD ADDR DESCRIPTION WORD ADDR DESCRIPTION 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 1 2 3...

Страница 64: ...4 5 6 7 0 1 2 3 4 5 6 7 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 WORD BIT DESCRIPTION WORD BIT DESCRIPTION Commen...

Страница 65: ...UENCER TABLE BIT ASSIGNMENTS PAGE OF SEQUENCER COUNTER ADDR FILE to SEQ LENGTH WORD ADDR MASK ADDR MASK STEP 17 10 07 00 FROM ADDR TO ADDR 17 10 07 00 17 10 07 00 17 10 07 00 WORD 1 WORD 2 WORD 3 WORD...

Страница 66: ...ble words The words remaining in memory can be determined by subtracting that number from the total memory available The text of this manual uses the following notational conventions to aid you when e...

Страница 67: ...dder diagram rung in Figure 4 2 shows the two input devices and the output device that are assigned bit addresses in the data table The bit addresses correspond to the location of the I O devices wire...

Страница 68: ...agram rung Figure 4 3 As condition instructions their on or off states determine the true or false condition of the rung Any bit in the data table excluding the processor work areas can be addressed b...

Страница 69: ...4 Figure 4 4 Examine On Instruction 04 13 112 012 Examine Off Instruction The Examine Off instruction is the logical opposite of the Examine On instruction It tells the processor to check the status o...

Страница 70: ...ut Latch L Output Unlatch U These instructions are used to set memory bits on or off in any area of the data table excluding the processor work areas and the input image table Output Energize Instruct...

Страница 71: ...tion 15 035 Output Latch and Unlatch Instructions There are two output instructions that are termed retentive These instructions are Output Latch L Output Unlatch U These instructions are usually used...

Страница 72: ...been latched on Figure 4 8 When the rung conditions for the Output Unlatch instruction go true the addressed memory bit is reset to zero off Figure 4 9 The output unlatch is also retentive This means...

Страница 73: ...OG position the addressed memory bit and output device if latched on will immediately be energized regardless of rung conditions WARNING Do not preset a bit on controlled by Latch Unlatch instructions...

Страница 74: ...each parallel logic branch of a rung The Branch Start is programmed immediately before the first instruction of each parallel logic path Branch End This instruction completes a set of parallel branch...

Страница 75: ...N or OFF may not be the logically expected state of the rung This condition exists until the BRANCH END instruction is installed and the rung is completed Solution To avoid the above condition adhere...

Страница 76: ...want to change the logic and insert the BRANCH START 3 Insert the desired parallel logic see Figure 4 14 4 Insert the BRANCH END Figure 4 14 Example New Rung With Branch Instruction 00 110 03 110 01 1...

Страница 77: ...n The END statement also appears before program steps are entered When a user supplied teletypewriter or keyboard printer is used the END statement is printed on the hardcopy printout At the right of...

Страница 78: ...t address 010 00 is displayed with a reverse video character cursor positioned at the first digit This cursor indicates where information is needed and moves to the next digits as information is enter...

Страница 79: ...ATCH instruction is initially OFF when entered as indicated below the instruction It can be preset ON by pressing a 1 after entering the bit address An ON will then be indicated below the instruction...

Страница 80: ...essed at any time provided the last digit has not been entered If the last digit was entered the instruction must be removed and the entire address must be re entered Word addresses unlike bit address...

Страница 81: ...Shift Register Any SHIFT REG HELP Provides a list of all instructions that use the SHIFT REG key All Directories Any CANCEL COMMAND To terminate The industrial terminal can be used to search the user...

Страница 82: ...Address keys Locates this address in the program excluding instructions and addresses in file Press SEARCH to locate the next occurrence of this address 1 Single rung display Any SEARCH DISPLAY Displ...

Страница 83: ...n to the left To bring it back on the screen press the key The output instruction can be accessed from anywhere in the rung by pressing SEARCH in any mode Single Rung Display Upon power up a multiple...

Страница 84: ...l keyboard can be used to change the processor mode when the keyswitch is in the RUN PROGRAM position The following key sequences can be used SEARCH 590 for run program mode SEARCH 591 for remote test...

Страница 85: ...a word or block instruction ON LINE Run Program SEARCH 5 1 Data INSERT CANCEL COMMAND Position the cursor on the word or block instruction whose data is to be changed Press the key sequence Cursor ke...

Страница 86: ...ed The input image table bits will be rewritten during the next I O scan If the wrong instruction is pressed an INSTRUCTIONS DO NOT MATCH message will be displayed Inserting a Rung A rung can be inser...

Страница 87: ...ugh not displayed will position itself on the first data digit Enter that digit to display the cursor Then cursor back to the address digits using the key and change the address as needed Use a leadin...

Страница 88: ...rechecked for accuracy All possible sequences of machine operation resulting from the change should be assessed in advance Be absolutely certain that the change must be done on line and that the chan...

Страница 89: ...17 and BCD value bits 00 13 During program execution these bits are constantly changing to reflect current states and values of program instructions Therefore when programming on line a decision must...

Страница 90: ...address or when it is desirable to enter new data and clear the status bits of an already used address The DATA INIT key should be pressed after the instruction key s and before the address is entered...

Страница 91: ...the RECORD key is pressed CAUTION When the RECORD key is pressed the instruction is entered into memory immediately If the rung logic is true the output instruction will be enabled The procedure for...

Страница 92: ...ON When the RECORD key is pressed the instruction will be removed immediately If the removal of the instruction causes the rung logic to become true the output will be enabled immediately NOTE Bit val...

Страница 93: ...latch and unlatch instructions are cleared to zero All other word and bit addresses are not cleared when the rung is removed Change an Instruction or Instruction Address An instruction can be replaced...

Страница 94: ...of the following procedures Step 1 Using the and cursor control keys cursor back the digit containing the error and correct it Step 2 Press the CANCEL COMMAND key It restores the ladder diagram displa...

Страница 95: ...key sequence SHIFT SEARCH Step 2 Place the cursor at the end of the rung Step 3 Complete the rung by changing the blank output to the desired output instruction using the procedure Changing an Instru...

Страница 96: ...le User Program and Messages 1 When Memory Write Protect is active memory cannot be cleared except for Data Table addresses 010 377 Data Table Clear Part of all of the data table can be cleared by pre...

Страница 97: ...tions exist because of the industrial terminal screen size Only one output instruction can be programmed in a rung Program only one rung to energize an output device to simplify troubleshooting and ma...

Страница 98: ...ondition instructions can be used with a Sequencer Input instruction if the output is a block instruction Up to 2 branches containing condition instructions can be used in parallel with a Sequencer In...

Страница 99: ...the output is not a block instruction Up to 3 Examine On or Off Shift Bit instructions can be used in series if the output is a block instruction Up to 4 branches containing condition instructions can...

Страница 100: ...Value Stored in the preset value area of the data table always 1008 words greater than its corresponding AC value This value is entered into memory by the user The preset value is the number of timed...

Страница 101: ...ls and stores this count in its accumulated value word When timing is complete when AC PR bit 15 is either set on or off depending on the type of timer instruction For all timers bit 17 is set on when...

Страница 102: ...se intervals As long as conditions remain true it increments its accumulated value word for each counted interval When the accumulated value equals the programmed preset value the timer stops incremen...

Страница 103: ...tatus Bits are Reset When Input Switch is Opened Input Switch 113 02 Enable Bit 003 17 Preset Value Accumulated Value Timed Bit 033 15 Output Lamp 011 04 Rung 1 TON Instruction Preset for 9 Sec Delay...

Страница 104: ...go false The enable bit bit 17 goes false when the timer begins rung 1 As long as its rung conditions remain false the TOF continues to time until the accumulated value equals the preset value When t...

Страница 105: ...Accumulated Value Timed Bit 047 15 Output Lamp 011 04 Rung 1 TOF Instruction Preset for 9 Sec Delay Rung 2 Timer Turns Off Bit 011 04 When Timed Out 05 TOF 1 0 113 047 15 04 047 011 PR 009 AC 009 Inp...

Страница 106: ...le Bit 052 17 Preset Value ACC Value Retained When Rung Condition Goes False Accumulated Value Timed Bit 052 15 Output Lamp 011 04 Rung 1 Retentive Timer Preset for 9 Sec Delay Rung 2 Timer Turns On B...

Страница 107: ...t of the retentive timer Figure 5 5 rung 3 to zero This instruction is given the same word address as its corresponding RTO instruction Figure 5 5 When rung conditions go true the RTR instruction rese...

Страница 108: ...cant Digit Accumulated Value in BCD Form Overflow Underflow Bit Set to 1 When CTU Overflows 999 or CTD Underflows 000 Down Counter Enable Bit Set to 1 When AC PR Up Counter Enable Bit The Up Counter C...

Страница 109: ...5 6 7 8 9 10 11 Overflow Bit Comes On at 1000th Event The Counter Does Not Reset Event to be Counted 111 11 AC PR 997 998 999 1 2 0 Accumulated Value ON OFF Enable Bit 053 17 ON OFF Count Complete Bi...

Страница 110: ...re 5 8 Figure 5 8 Counter with Reset Diagram for Preset 9 and Programming ON OFF 1 2 4 5 6 7 8 9 10 11 Event to be Counted 111 11 AC PR 12 1 2 Accumulated Value ON OFF Enable Bit 053 17 ON OFF Count C...

Страница 111: ...position Rung conditions go false Power outage occurs provided memory backup power is maintained for CMOS RAM memory Each time the CTD rung goes true bit 16 the enabled bit is set on When the Accumul...

Страница 112: ...y a value other than 000 For this reason a Get Put transfer Section 6 1 rather than a CTR instruction is usually used to load a value in the CTD Accumulated Value word Get Put instructions are discuss...

Страница 113: ...Counter 051 Then Overflow Bit Resets Counter 050 06 110 Timer and Counter instructions are entered into memory with the processor in the program mode Timer instructions are programmed by entering a w...

Страница 114: ...ically enters a 4 or 5 digit default word address depending on the data table size When a 4 or 5 digit word address is displayed and a 3 or 4 digit word address is required the programmer must enter l...

Страница 115: ...ed Value at a rate specified by the time base When the rung is FALSE the timer resets the Accumulated Value to 000 See Note TOF TIMER OFF DELAY XXX TOF TB PR YYY AC ZZZ When the rung is FALSE the time...

Страница 116: ...the CTU Accumulated Value and status bits are reset to 000 See Note CTD DOWN COUNTER XXX CTD PR YYY AC ZZZ Each time the rung goes TRUE the Accumulated Value is decreased one count The Accumulated Val...

Страница 117: ...rst 1000 scans When the counter overflows the timer stops Rung 4 gets the value of the timer after 1000 scans and displays it in milliseconds as the result of the divide instruction Rung 5 and 6 reset...

Страница 118: ...x Store 2 xxx To enable the programmer to estimate the scan time a proposed program may require the average execution times required for PLC 2 30 instructions are presented in Tables 5 D through 5 G T...

Страница 119: ...File down instruction having a file 18 words long has an execution time see Table 5 E T 107 7 4 18 107 133 2 240 microseconds File Search and File Diagnostic instructions must be increased by a facto...

Страница 120: ...t1 Put1 G PUT 5 8 6 6 Les1 Equ1 7 4 6 6 Get Byte1 Limit Test1 B L 4 5 4 5 Add1 Subtract1 Multiply1 Divide1 BCD BIN1 BIN BCD1 x CONVERT 0 CONVERT 1 8 6 8 6 51 0 91 0 59 6 37 2 Branch Start1 Branch End1...

Страница 121: ...depends on a length of files and b number of words step Section 5 6 2 2 Execution Time is increased by 4 6 x the number of words searched before a match is found Section 5 6 2 3 Execution Time is incr...

Страница 122: ...s Table 5 F Average Execution Times For File to File Move and File Complement Instructions Time Microseconds Rate Words per Scan Dist Complete Mode Complete Mode 5 10 15 25 50 100 256 512 119 153 187...

Страница 123: ...ey require 6 microseconds The first scan the rung is false after the done bit is set requires 17 6 microseconds to reset flags and counters Table 5 G Average Execution Times In Microseconds For FILE T...

Страница 124: ...of 3 digit binary coded decimal numbers The Les and Equ instructions compare data such as 3 digit numeric values in BCD format using the lower 12 bits of a data table word Figure 6 1 This 3 digit valu...

Страница 125: ...te 2 1 0 0 1 1 0 0 1 1 1 1 0 1 1 1 1 Bits 00 07 Contain Octal Value of Lower Byte Bits 10 17 Contain Octal Value of Upper Byte 3 18 3 5 78 21 20 21 20 22 21 20 22 21 20 21 20 22 21 20 22 There are thr...

Страница 126: ...transfer will occur Data transfer occurs only when the rung is true The Get instruction can be programmed either at the beginning of a rung or with one or more condition instructions preceding it Cond...

Страница 127: ...n instructions are LESS THAN EQUAL TO GET BYTE B LIMIT TEST L Data comparison operations differ from data transfer operations in that data table values are not transferred Instead the values at differ...

Страница 128: ...han comparison is made with the Get Les pair of instructions The BCD value of the Get instruction is the changing value It is compared to the BCD value of the Les instruction the reference value Figur...

Страница 129: ...re 6 7 Equal To Comparison 03 02 120 010 G YYY 030 100 035 Reference Value When YYY 100 GET EQU comparison is true and 010 02 is energized Less Than or Equal To This comparison is made using the Get L...

Страница 130: ...TE Only one Get instruction is required for this parallel comparison The Les and Equ instructions are programmed on parallel branches Figure 6 9 Greater Than or Equal To Comparison 05 04 120 010 G 440...

Страница 131: ...tal value stored in that byte is then compared to the upper and lower octal values of the Limit Test instruction If the Get Byte value is equal to or between the Limit Test values the comparison is tr...

Страница 132: ...keyboard with the processor in the program mode When entered they are displayed as intensified and blinking and will continue to blink until all information is entered The default word address 010 can...

Страница 133: ...ess See Note LESS THAN XXX YYY The LESS THAN instruction should be preceded by a GET instruction 3 digit BCD values at the GET and LESS THAN word addresses are compared If the logic is TRUE the rung i...

Страница 134: ...uction Other condition instructions if used should be programmed before the Get instructions The arithmetic instructions are programmed in the output position of the ladder diagram rung They are assig...

Страница 135: ...rmation on Binary and BCD number systems The Add instruction tells the processor to add the two values stored in the Get words The sum is then stored at the Add instruction word address When the sum e...

Страница 136: ...tract word bit 16 is set on In the run test or run prog mode the negative sign will appear on the industrial terminal screen Figure 6 14 Subtract Instruction 14 009 111 042 G 100 130 G 109 041 Must be...

Страница 137: ...t Get instruction value by the second Get instruction value The result is stored in two data table words addressed by the Divide instruction Figure 6 16 Usually two consecutive data table word locatio...

Страница 138: ...red Refer to Table 6 B for a summary of these instructions A 3 4 or 5 digit default word address 010 0010 or 00010 will be displayed above the instruction provided the data table is expanded according...

Страница 139: ...ULTIPLY instruction is an output instruction It is always preceded by two GET instructions which store the values to be multiplied See Note Two word addresses are required to store the 6 digit product...

Страница 140: ...alues are governed by the I O rack configura tion BCD ADDR Address where the first three digits of the BCD number are stored The second three digit address is where the three least significant BCD dig...

Страница 141: ...inary number The upper 4 bits of the binary data will be transferred to the lower 4 bits of the lower BCD address If the binary data changes while the rung is true the BCD result will also change If t...

Страница 142: ...initially displayed 3 4 or 5 will depend on the size of the data table Initially displayed default values are governed by the I O rack configura tion BINARY ADDR Stores the binary number BINARY DATA T...

Страница 143: ...r 6 6 20 Figure 6 20 Binary to BCD Conversion Example Rung BINARY TO BCD BINARY ADDR 025 DATA 111111111111 BCD ADDR 201 202 DATA 004095 025 OV 14 Artisan Technology Group Quality Instrumentation Guara...

Страница 144: ...system should not be operated without a hard wired master control relay and emergency stop switches to provide emergency I O power shut down Emergency stop switches can be monitored but should not be...

Страница 145: ...n in their last state When MCR zone is false nonretentive outputs are de energized The MCR and ZCL instructions control the zoned outputs differently MCR When false all nonretentive outputs within the...

Страница 146: ...speeds up the response of output devices to the program and the update of input data for program use The immediate I O instructions are usually used where I O modules interface with I O devices that o...

Страница 147: ...tructions are scanned and executed in the order in which they were entered except where jumps and subroutines are used The scan sequence when jumps and subroutines are employed is described in those s...

Страница 148: ...iate Input instruction only when necessary This depends on both the response time of the specific input devices and modules and on the position of the rungs examining these inputs in the program It is...

Страница 149: ...ate Output instruction only when necessary This depends on the response time of output modules and devices and on the position of the rungs addressing the module group The Immediate Output instruction...

Страница 150: ...m Scan Module Group Output Immediate Output Instruction Interrupts Program Scan Word 014 I O Scan Program Scan Control Bits of Word 014 Here in Program Writes all 16 Bits from one Output Image Table W...

Страница 151: ...Two MCR instructions are required to control a group of outputs The first MCR instruction is programmed with input conditions to begin the zone The second MCR instruction is programmed unconditionally...

Страница 152: ...5 Unlike local I O racks each remote I O rack can have up to 128 I O points using one of the following arrangements One 128 I O chassis Two 64 I O chassis One 64 I O chassis and two 32 I O chassis Fou...

Страница 153: ...0 1 2 3 Module Groups 4 5 6 7 Module Groups 0 1 Module Groups 2 3 Module Groups 4 5 Module Groups 6 7 Module Groups Remote I O Scanner Distribution Panel Rack 4 Remote Rack 3 Remote Rack 2 Remote Rac...

Страница 154: ...rack Table 7 B For example bits 125 078 125 048 correspond to rack 1 and bits 125 038 125 008 correspond to rack 2 Although bits 126 138 126 108 are not used as fault status bits they cannot be used...

Страница 155: ...ts 125 138 and 125 128 will be set on By selecting either dependent or independent fault zone programming the user can disable certain parts of the program or the entire program when a fault occurs in...

Страница 156: ...tus bits as Examine Off conditions for the MCR or ZCL zones Figures 7 7 and 7 8 When a fault occurs in a remote I O chassis the corresponding fault status bit is set on The MCR or ZCL zone conditioned...

Страница 157: ...25 Programming for Rack Groups 2 and 3 Independent programming for I O configuration in Figure 7 5 When a fault status bit is set on the MCR or ZCL zone is false and controls all outputs in the zone M...

Страница 158: ...125 15 125 14 125 13 125 11 125 The time required to perform scans of I O differs depending upon whether the I O racks are local or remote The scan time for local systems is 0 5 ms per rack The scan t...

Страница 159: ...ds and if it times out a processor fault occurs and the system shuts down If the time for complete scan exceeds 115 milliseconds the watchdog timer will time out and the processor will fault The watch...

Страница 160: ...s 100 microseconds per scan When FALSE execution time is 17 6 microseconds Table 7 D The Following Instructions Reset the Watchdog Timer File To File Move Word To File Move File To Word Move File To F...

Страница 161: ...other than the Data Cassette Recorder Cat No 1770 SA or Digital Cartridge Recorder Cat No 1770 SB is used The communication rate is the number of bits per second baud sent to from channel C The baud f...

Страница 162: ...data table bit excluding the processor work areas can be accessed by the contact histogram command The status of the bit on or off and the length of time the bit remained on or off in hours minutes a...

Страница 163: ...connecting peripheral device to Channel C and selecting proper baud rate To terminate After pressing DISPLAY the data of the histogram will be displayed on every other line with 5 frames of data per...

Страница 164: ...ng RECORD 0 on the PLC 2 Family overlay and by pressing RECORD ON TAPE on the cassette recorder As memory is being recorded the industrial terminal will count and display the number of data table word...

Страница 165: ...ber of program errors and whether the data table was verified will be displayed The automatic verification command will self terminate when complete If program errors exist they can be displayed and l...

Страница 166: ...ry The data cartridge recorder can be operated from the industrial terminal keyboard It can also be operated in the same manner as a 1770 SA digital cassette recorder using both the recorder control p...

Страница 167: ...ta table of the taped program Set the data table size as described in Section 3 2 1 Data Table Configuration If the size of the data table on tape is not immediately available and the processor is con...

Страница 168: ...overlay The printout will begin from the current rung allowing all or part of the program to be printed When the printout is complete this command is automatically terminated This command can be termi...

Страница 169: ...minated The total memory dump command can be terminated prior to completion by pressing ESC on the peripheral printer or CANCEL COMMAND on the PLC 2 family overlay Figure 8 2 Data Table Printout in He...

Страница 170: ...y 2 or 3 rungs of programming are required to display a message by program logic Intelligent printer interface the RG module can monitor a busy ready signal from the printer Selectable communication r...

Страница 171: ...ation rate to 19 200 bits Selectable number of data bits you can choose either seven or eight data bits per character Messages can be entered into memory from either the T3 industrial terminal or a pe...

Страница 172: ...s entered by pressing RECORD DISPLAY on the PLC 2 Family keytop overlay There are 6 report generation commands used to enter control words and to store print report and delete messages and to display...

Страница 173: ...1 CANCEL COMMAND can only be used if the function was entered by a command from a peripheral device 2 Requires Series B Revision F or later keyboard Bits from eight consecutive user selected words co...

Страница 174: ...mpt MESSAGE ALREADY EXISTS While entering a message each key pressed except the SHIFT CTRL ESC or RUB OUT keys generates a code that is stored in one byte of memory This includes ASCII and graphic cha...

Страница 175: ...s desired to report the output condition or or off of a device SR6 during each cycle of machine operation Delimiters would be used to denote the output address 013 05 and the cycle counter accumulativ...

Страница 176: ...inted ESC or CANCEL COMMAND can be used to return to ladder diagram display Accessible in any mode the message index command prints a list of the message numbers used and the amount of memory in words...

Страница 177: ...es 3 words of memory storing CRTL P in one byte and each remaining character in one byte each If the cursor had been at column 0 line 0 and normal space and line feed commands were used it would have...

Страница 178: ...inuously until REPT LOCK is pressed again SHIFT Allows the next key pressed to be a shift character SHIFT LOCK Allows all subsequent keys pressed to be shift characters until SHIFT or SHIFT LOCK is pr...

Страница 179: ...capability CTRL P 5 P Turns Channel C Outputs ON CTRL P 4 P Turns Channel C Outputs OFF CTRL I Horizontal tab that moves the cursor to the next preset 8th position CTRL K Clears the screen from curso...

Страница 180: ...DATA LINK ESCAPE DEVICE CONTROL 1 DEVICE CONTROL 2 DEVICE CONTROL 3 DEVICE CONTROL 4 NEGATIVE ACKNOWLEDGE SYNCHRONOUS IDLE END OF TRANSMISSION BLOCK CANCEL END OF MEDIUM SUBSTITUTE ESCAPE FILE SEPARAT...

Страница 181: ...ure 9 3 Figure 9 3 Parity Switch Location Halftone Once automatic report generation is activated the message request bits are scanned by the industrial terminal for zero to one transition Each time on...

Страница 182: ...it 12 of the third message control word would request message 312 on a false to true transition Figure 9 4 Figure 9 4 Bit Address Message Number Relationship Control Word Number Message Numbers Contro...

Страница 183: ...re placed in corresponding slots Hazardous or unexpected machine operation could result Damage to equipment and or personal injury could result Using latch and unlatch instructions automatic report ge...

Страница 184: ...t Generation Chapter 9 9 15 Figure 9 6 Example Program to Request a Message L U Event Event Done Request Request Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisantg...

Страница 185: ...tional module can use both the read and write operations During a read operation data is read into the processor s memory from the module During a write operation data is written to the output module...

Страница 186: ...ite bit that controls the direction of transfer are set by a bit pattern in the output image table byte 2 I O scan The processor requests a transfer by sending the output image table byte data to the...

Страница 187: ...r counter data and addresses is shown in Table 10 A After locating the file address in the timer counter area of the data table the processor then duplicates and transfers the file data consecutively...

Страница 188: ...ile 1008 above the data address ENABLE BIT EN Automatically entered from the module address Set on when rung containing the instruction is true DONE BIT DN Automatically entered from the module addres...

Страница 189: ...le to decide the number of words to be transferred See the data sheet or user s manual pertaining to the module for additional information The block length heading of the instruction will accept any v...

Страница 190: ...ey sequence BLOCK XFER 0 for write and BLOCK XFER 1 for read Misuse and or inadvertent changes of instruction data can cause run time errors when The module address is given a non existent I O rack nu...

Страница 191: ...d Last File Word Input image table byte contains done bit Storage location of file address contains file address in BCD R Bit 17 Read BLOCK XFER READ DATA ADDR 030 MODULE ADDR 121 BLOCK LENGTH 08 FILE...

Страница 192: ...ck transfer read instructions would be used one for each desired transfer length starting at the same first word The read instructions would have the same module address data address and file address...

Страница 193: ...al for any information unique to that module The programming example shown in Figure 10 5 illustrates how multiple reads of different block lengths from one module can be programmed When any one of th...

Страница 194: ...RANSFER READ DATA ADDR 052 MODULE ADDR 141 BLOCK LENGTH 03 FILE 160 167 014 EN 17 114 DN 17 014 17 2 3 1 2 3 1 2 3 Inputs Inputs Inputs Input 1 Input 2 Input 3 NOTES 1 The same discussion applies when...

Страница 195: ...chance be in the same configuration as the rack group and slot numbers found in block transfer data addresses The boundary word data bits can be set to zero manually using bit manipulation SEARCH 53 o...

Страница 196: ...data in the buffer is valid it is immediately transferred to another file in the data table where it can be used If invalid it is not transferred but written over in the next transfer Another techniq...

Страница 197: ...transfer B Diagnostic Bit is TRUE for each word to be moved in rungs 5 7 valid data 00 02 010 010 U 00 010 11 EN 07 111 014 BLOCK TRANSFER READ DATA ADDR 030 MODULE ADDR 140 BLOCK LENGTH 03 FILE 050 0...

Страница 198: ...1 and 052 will be transferred to words 151 and 152 if the diagnostic bit is on Bidirectional block transfer is the sequential performance of both operations The order of operation is generally determi...

Страница 199: ...ransfer Chapter 10 10 15 The data table locations and block instructions for this example are shown in Figure 10 8 Artisan Technology Group Quality Instrumentation Guaranteed 888 88 SOURCE www artisan...

Страница 200: ...OCK LENGTH 05 FILE 060 064 DN 06 113 Data Table W R 1 W 1 3 0 041 1 Block Transfer Read File 0 6 0 141 010 Output Image Table Low Byte Data Addresses 5 words of data table are to be written to the bid...

Страница 201: ...ses are required one to receive data transferred from the module the other containing data to be transferred to the module In this example they are 060 and 070 The consecutive storage locations contai...

Страница 202: ...il the Done bit is set Unequal Block Lengths Consult the user s manual for the block transfer module of interest for programming guidelines when setting the block lengths to unequal values WARNING Whe...

Страница 203: ...subroutine can be called upon repeatedly from selected points in the main program Subroutines can be used to conserve memory in applications where repetitive programming is required or when sections...

Страница 204: ...program execution jumps to label 07 13 117 Reprogram rungs that require updates when jump is active rung 3 is reprogrammed Jumped sections of programs are not scanned A Jump instruction can be progra...

Страница 205: ...uts are not updated and outputs remain in their last state Timers and counters cease to function Critical rungs should be reprogrammed outside the jumped section of the program The Jump Subroutine ins...

Страница 206: ...XX JMP When rung is TRUE processor jumps forward to the referenced LABEL in Main Program XX two digit octal identification number Same as LBL with which it is used RET JSR JUMP TO SUBROUTINE XX JSR Wh...

Страница 207: ...11 4 Multiple JUMPS to LABEL in Subroutine Area Subroutine Area 1st Subroutine 2nd Subroutine To Main Program From JSR 03 From JSR 04 JMP 02 LBL 03 LBL 04 RET JMP 02 LBL 02 RET Artisan Technology Grou...

Страница 208: ...e assigned octal identification numbers from 00 77 The label identification number must be the same as that of the Jump and or Jump to Subroutine instruction with which it is used A label instruction...

Страница 209: ...injury could result NOTE Care should be taken not to misuse the Jump instructions and subroutine programming Misuse generally results in a run time error which causes the processor to fault Misuse of...

Страница 210: ...put instruction Must always jump from main program into subroutine area or from one subroutine to another Can jump 1 or more times to the label with the same identification number Uses 1 word of memor...

Страница 211: ...ction after subroutine jump 046 12 NOTE Do not misuse the Jump to Subroutine instruction Misuse generally results in a run time error which causes the processor to fault Misuse will cause the followin...

Страница 212: ...the main program It cannot be inserted between rungs It requires one memory word can be programmed only once and cannot be removed except by clearing the entire subroutine area or the entire memory Up...

Страница 213: ...til eight levels of calls are involved Figure 11 10 a shows three levels of nested subroutines The main program calls Level 1 at label 01 a Level 1 in turn calls Level 2 at label 02 b Note that Level...

Страница 214: ...n program are causes of run time error If an output instruction in the subroutine area is left on after the processor has completed the program scan the output will remain on regardless of its rung co...

Страница 215: ...el 1 Subroutine Level 2 Subroutine Level 3 JSR RET JSR RET RET 02 03 JSR 01 Main Program LBL 01 LBL 02 LBL 03 a b c d e f Subroutine Area A LBL SCT 01 051 15 JSR 051 01 PR 999 AC 000 JSR 01 Main Progr...

Страница 216: ...truction does not have a user assigned identification number because it may be paired by the processor with any one of several JSR instructions as the result of multiple jumps to the subroutine area T...

Страница 217: ...es the number of words in the file file length with its preset value It points to a particular word in the file position with its accumulated value The counter address is also referred to as the instr...

Страница 218: ...dvertently programmed to overlap or be totally contained within another Care should be taken in assigning file areas to avoid unintentionally altering the contents of one file by the operation of anot...

Страница 219: ...en the rung condition is true and or when the instruction is operating DONE BIT DN Automatically entered from the counter address Set high when the operation is complete and remains high as long as th...

Страница 220: ...As long as the rung is true the operation will take place each scan If the counter accumulated value position changes while the rung is true the data at the new position will be operated upon An examp...

Страница 221: ...ed in Table 12 A Table 12 A Modes of Instruction Operation Mode of Operation R Rate Per Scan Number of Words Operated Upon COMPLETE R File Length Entire file per scan DISTRIBUTED COMPLETE 0 R File Len...

Страница 222: ...alse to true transition of the rung condition The rung would have to go false and then true after the operation is complete in order to repeat the instruction If the rung remained true on subsequent s...

Страница 223: ...gram scans This is to avoid overextending the scan time of any one program scan This scan can be done by selecting the distributed complete mode Any rate per scan R can be chosen where 0 R 4 file leng...

Страница 224: ...e results of a File instruction operating in the distributed complete mode until the done bit is set At completion the rung containing the instruction could either be true or false If the rung is true...

Страница 225: ...than 1 Scan A A Status bits are reset to zero and counter is reset to word 1 a Rung is True at completion Rung Condition Enable Bit 17 Done Bit 15 Instruction Operation More than 1 Scan A A Done bit...

Страница 226: ...r resets to position 001 after the last word is operated upon 1 Word Operation 1 Word Operation 1 Word Operation 1 Word Operation File Word 1 File Word 2 File Word 3 Word 14 Last Word 1st Rung Enable...

Страница 227: ...emental Mode Rung Condition Enable Bit 17 Done Bit 15 Instruction Operation 1 or More Scans A A Enable bit is reset to zero B Status bits are reset to zero and counter is reset to word 1 following ope...

Страница 228: ...outside the file This causes a run time error Additional programming should be used to assure that the instructions which change the instruction counter accumulated value do not cause the preset valu...

Страница 229: ...t location 474 410 File A 10 words 421 474 File R 10 words 505 Instruction overview Output instruction Key sequence FILE 10 Requires 5 words of user program Can operate in incremental distributed comp...

Страница 230: ...e default values Bold numbers must be replaced by user entered values The number of default address digits initially displayed 3 4 or 5 will depend on the size of the data table Initially displayed de...

Страница 231: ...ion 12 5 Figure 12 13 FILE TO FILE MOVE Example Rung FILE TO FILE MOVE COUNTER ADDR 200 POSITION 001 FILE LENGTH 010 FILE A 410 421 FILE R 474 505 RATE PER SCAN 010 200 EN 17 2 DN 15 This output instr...

Страница 232: ...nstruction and the corresponding instruction s which manipulate the accumulated value Do not inadvertently manipulate the preset or the accumulated values Inadvertent changes to these values could res...

Страница 233: ...the instruction in the accumulated value area of the data table POSITION Current word being operated upon accumulated value of counter FILE LENGTH Number of words in file preset value of the counter F...

Страница 234: ...uction transfers a duplicate of the value in a specified data table word W Figure 12 17 into a word in file R that is pointed to by the counter accumulated value Instruction overview Output instructio...

Страница 235: ...be reserved for the instruction and the corresponding instruction s which manipulate the accumulated value Do not inadvertently manipulate the preset or the accumulated values Inadvertent changes to...

Страница 236: ...truction in the accumulated value area of the data table POSITION Current word being operated upon accumulated value of counter FILE LENGTH Number of words in file preset value of the counter WORD ADD...

Страница 237: ...s chosen when bit information is pertinent and hexadecimal display is chosen when word values are desired ASCII is chosen when character values are desired Data can be entered and or displayed in eith...

Страница 238: ...version table where X 0 Binary Data Monitor 1 Hexadecimal Data Monitor 2 ASCII Data Monitor2 1 The cursor must be positioned on the file instruction in the ladder diagram 2 Requires Series B Revision...

Страница 239: ...E TO FILE MOVE COUNTER ADDR 031 POSITION 001 FILE LENGTH 035 FILE A 200 242 FILE R 300 342 POSITION FILE A DATA FILE R DATA 001 A4B2 59AE 002 3C4D A23D 003 E4F6 4BC5 004 2CA3 ABC6 005 5BCF 36AE 006 F1...

Страница 240: ...e data is displayed in binary representation data bits are assumed to be numbered from right to left 00 17 respectively Each column in the display represents one file In Figure 12 20 two files are sho...

Страница 241: ...0 When there the field cursor is controlled by the four cursor control keys SHIFT and SHIFT If the header contains no changeable data the field cursor cannot be moved there The field cursor can be mov...

Страница 242: ...ation is defined as a full screen of file words in the file section For example in Figure 12 20 a page is shown which begins at position 001 and ends at position 015 To display longer files additional...

Страница 243: ...the file will not be allowed An invalid key message will appear Scrolling procedures are summarized in Table 12 C Data can always be entered or changed when the processor is in program mode In run pr...

Страница 244: ...to the file word located by the Field Cursor CANCEL COMMAND Terminates Data Monitor Mode and returns display to Ladder Diagram If in On Line Data Change CANCEL COMMAND will terminate On Line Data Chan...

Страница 245: ...shifted into the file and the data in the last first word of the file will be shifted up down into the output word Figure 13 1 Example of a 64 Word SHIFT FILE UP DOWN Register Starting at Word 4008 4...

Страница 246: ...IFO Stack Starting at Address 4008 400 477 64 words allocated for FIFO stack 130 FIFO Load enters data into stack Input Addr 040 FIFO Unoad removes data from stack Output Addr This instruction can be...

Страница 247: ...The counter address specified for the Shift File Up instruction should be reserved for that instruction Do not manipulate the counter preset or accumulated values Inadvertent change to these values c...

Страница 248: ...ble FILE LENGTH Number of words in file preset value of the counter FILE Starting word of file INPUT ADDRESS Address of input word OUTPUT ADDRESS Address of output word RATE PER SCAN Number of words o...

Страница 249: ...omplete mode it will take a number of scans to shift in one input word of data and to shift out one word of data to the output word The output word data should NOT be considered valid until the done b...

Страница 250: ...and unload pointers will load and unload words at any point in the file The body of the file will float between these boundaries Do not expect to find any particular data entry at any specific data t...

Страница 251: ...RESS Address of input word outisde the stack INPUT DATA Current data at input address 030 FL 15 Numbers shown are default values Bold numbers must be replaced by user entered values The number of defa...

Страница 252: ...SHIFT REG 14 A display represented by Figure 13 5a will appear To program FIFO unload press keys SHIFT REG 15 A display represented by Figure 13 5b will appear Figures 13 6a and 13 6b show the format...

Страница 253: ...ZE 064 NUMBER IN FILE 000 FILE 400 477 INPUT ADDR 130 INPUT DATA 0000 200 EN 17 200 FL 15 200 EM 14 FIFO LOAD COUNTER ADDR 200 FIFO SIZE 064 NUMBER IN FILE 000 FILE 400 477 OUTPUT ADDR 040 OUTPUT DATA...

Страница 254: ...register such as shown in Figure 14 1 The user specifies the bit number to be examined and the starting address of the shift register Set Shift Bit and Reset Shift Bit are output instructions which s...

Страница 255: ...Starting at Location 400 A Input Bit A Bit one of Bit Shift Register L 123 Output Bit A 32 400 401 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 L 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 R 17 48 402...

Страница 256: ...a bit shift occurred as shown by the dotted line in Figure 14 1A The instruction operates in the complete mode The status of the input bit is shifted into the first bit in the register and the status...

Страница 257: ...data table NUMBER OF BITS Number of bits in the file FILE Starting address of file INPUT Address of input bit OUTPUT Address of output bit 030 DN 15 Figure 14 3 shows the format of Figure 14 2 after t...

Страница 258: ...g procedure continues throughout the stack until bit 1 is ejected from the file into a specified bit A in an output word If the shift bit register of Figure 14 1B had been 123 bits long it would have...

Страница 259: ...d Bit Shift Right The procedure for using the data monitor mode for data entry or monitor is presented in Chapter 12 This condition instruction that examines a user specified bit in a bit shift regist...

Страница 260: ...rned by the I O rack configuration FILE Starting address of the file file of bit shift instruction BIT NUMBER Decimal number of the bit to be examined 1 999 Figure 14 5 shows the format of Figure 14 4...

Страница 261: ...ers shown are default values Bold numbers must be replaced by user entered values The number of default address digits initially displayed 3 4 or 5 will depend on the size of the data table Initially...

Страница 262: ...The instruction executes upon a true rung condition NOTE If file is shifted new data in the same bit position will be set if set shift bit rung is still true Instruction overview Output instruction K...

Страница 263: ...for the following condition of the bit shift register of Figure 14 1 File starts at word 4008 Bit No set bit number 67 in shift register Figure 14 1 to on 1 Figure 14 9 SET SHIFT BIT Example Rung SET...

Страница 264: ...l depend on the size of the data table Initially displayed default values are governed by the I O rack configuration FILE Starting address of the file file of bit shift instruction BIT NUMBER Decimal...

Страница 265: ...e some marked differences Both are block instructions that contain a counter and a file The instructions require the entry of more than one address Each has a corresponding data monitor display for mo...

Страница 266: ...re 15 2 Sequencer Table Format in the Data Table Data Table Data Table 024 024 024 024 Step 001 002 Step 001 002 Step 001 002 00 01 01 01 10 10 00 00 00 01 11 01 11 00 10 10 00 01 01 11 00 11 00 11 10...

Страница 267: ...row of peg locations The presence of 1 or more pegs produces a single tone or a musical chord If the cylinder wall containing the pegs could be removed cut along its axis to separate the first and las...

Страница 268: ...is true This means that once the rung is enabled the counter is incremented to the next step and the data in that step will be outputted every scan that the rung remains true The instruction will not...

Страница 269: ...ing bit location A 1 in a mask bit location allows the corresponding bit to be operated upon When all the output data bits are relevant to the instruction a mask of all ones should be used A mask word...

Страница 270: ...counter address for the Sequencer Output instruction should be reserved for that instruction Do not manipulate the counter accumulated or preset values Inadvertent changes to these values could resul...

Страница 271: ...ion in sequencer table accumulated value of counter SEQ LENGTH Number of steps preset value of counter WORDS PER STEP Width of sequencer table number of columns FILE Starting address of sequencer tabl...

Страница 272: ...0 0 0 0 1 1 0 0 1 0 1 1 0 0 1 0 1 1 0 1 1 1 0 1 1 0 0 1 0 NOTE 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Bit Numbers Sequencer Table Step 008 Mask...

Страница 273: ...a specified word address of the instruction Figure 15 8 Example Binary Data Monitor Display of a SEQUENCER OUTPUT BINARY DATA MONITOR SEQUENCER OUTPUT COUNTER ADDR 054 STEP 008 SEQUENCER LENGTH 009 F...

Страница 274: ...e address When programmed in this manner the Sequencer Input and Output instructions will track through a controlled sequence of operation The length of the sequence is equal to the number of steps in...

Страница 275: ...TEP 1 FILE 110 110 MASK 010 010 Numbers shown are default values Bold numbers must be replaced by user entered values The number of default address digits initially displayed 3 4 or 5 will depend on t...

Страница 276: ...puts corresponding to the specified input words less those inputs that are masked is equal to the status of all 64 bits of data in step 006 of the sequencer table the logic of the instruction is true...

Страница 277: ...is loaded AC PR the done bit is set The next false to true transition of the rung condition will load the data beginning at step 1 The counter should be set to zero for start up purposes if it is desi...

Страница 278: ...late the counter accumulated or preset values Inadvertent changes to these values could result in unpredictable or hazardous machine operation or run time error Damage to equipment and or personal inj...

Страница 279: ...preset value of counter WORDS PER STEP Width of sequencer table number of columns FILE Starting address of sequencer table LOAD WORDS Words fetched by the instruction 030 DN 15 INPUT WORDS 1 010 3 XXX...

Страница 280: ...xample Rung SEQUENCER LOAD COUNTER ADDR 0056 CURRENT STEP 008 SEQ LENGTH 012 WORDS PER STEP 4 FILE 0510 0567 0056 EN 17 0056 DN 15 INPUT WORDS 1 0111 3 0112 2 0113 4 0314 16 114 Artisan Technology Gro...

Страница 281: ...ta Files A and B and place the result of the logic operation in a third File R Figure 16 1 The File Complement instruction takes the logical complement of each bit in File A and stores it in the corre...

Страница 282: ...t Instruction Key sequence FILE 14 Requires 6 words of user program Can operate in incremental distributed complete or complete mode Counter is internally indexed by the instruction Programming File t...

Страница 283: ...NGTH Number of words in file preset value of the counter FILE A Starting address of source file A FILE B Starting address of source file B FILE R Starting address of destination file R RATE PER SCAN N...

Страница 284: ...he corresponding bit in File B If either of the bits is a 1 a 1 is stored in the corresponding bit location in File R If neither of the compared bits is a 1 a 0 is stored in File R Table 16 B Table 16...

Страница 285: ...e contents of two data Files A and B and places the results of the logic operation XOR exclusive OR in a third File R The logic operation XOR compares each bit in file A to the corresponding bit in Fi...

Страница 286: ...tion press keys FILE 18 The format and the technique for insertion of numbers will be identical to that of the File to File AND Figure 16 2 except that the logic operation XOR replaces AND The procedu...

Страница 287: ...GTH 002 FILE A 110 110 FILE R 110 110 RATE PER SCAN 001 030 EN 17 Numbers shown are default values Bold numbers must be replaced by user entered values The number of default address digits initially d...

Страница 288: ...N 17 050 DN 15 The Word to File logic instructions are Word to File AND Word to File OR Word to File EXCLUSIVE OR XOR These three instructions are output instructions which during a true rung decision...

Страница 289: ...ation into the corresponding word of File R Figure 16 6 The logic operation AND compares each bit in the word to the corresponding bit in the File B word If the compared bits are both 1 a 1 is stored...

Страница 290: ...e 16 7 WORD TO FILE AND Format WORD TO FILE AND COUNTER ADDR 030 POSITION 001 FILE LENGTH 001 WORD ADDR 110 FILE B 110 110 FILE R 110 110 030 DN 15 Numbers shown are default values Bold numbers must b...

Страница 291: ...AND Example Rung WORD TO FILE AND COUNTER ADDR 200 POSITION 003 FILE LENGTH 006 WORD ADDR 400 FILE B 500 505 FILE R 600 605 200 DN 15 This instruction performs an OR operation on the contents of a spe...

Страница 292: ...unpredictable or hazardous machine operation or run time error Damage to equipment and or personal injury could result To program a Word to File OR press keys FILE 17 The format and the technique for...

Страница 293: ...Word to File XOR instruction should be reserved for the instruction and the corresponding instructions which manipulate the accumulated value Do not inadvertently manipulate the preset or accumulated...

Страница 294: ...ched and a counter Figure 17 1 Upon false true transition of rung decision the input word data is compared to the file data When a match is found the position counter accumulated value indicates that...

Страница 295: ...after an additional false true transition Instruction Overview Output instruction Key Sequence FILE 21 Counter is manipulated by instruction Requires 4 user program words Programming File Search Instr...

Страница 296: ...of the instruction in the accumulated value area of the data table POSITION Current word being operated upon accumulated value of counter FILE LENGTH Number of words in file preset value of the counte...

Страница 297: ...ransition of the rung searches the specified file File R from the XOR instruction for 1 When a 1 is found the Diagnostic instruction cross references the bit address in the file to the corresponding b...

Страница 298: ...tput I O in bits 00 03 Any leading digits are stored in BCD in bits 4 7 and 10 13 Word 502 stores the rack number in bits 14 17 The module group number in bits 10 13 the high low 1 0 slot in bit 04 an...

Страница 299: ...umber of default address digits initially displayed 3 4 or 5 will depend on the size of the data table Initially displayed default values are governed by the I O rack configuration COUNTER ADDRESS Add...

Страница 300: ...tion will be stored in words 500 to 502 inclusive The procedure for using the data monitor for data entry or monitor is presented in Chapter 12 Figure 17 6 FILE DIAGNOSTIC Example Rung FILE DIAGNOSTIC...

Страница 301: ...f they exist Moves cursor to the bit to be changed Enter a 1 to set bit ON or a 0 to set bit OFF Forcing or removing forces from input bits or output devices To terminate FORCE ON Test or Run Program...

Страница 302: ...END Position cursor on TEMPORARY END instruction and press key sequence Bit monitor allows the status of all 16 bits of any data table word to be displayed Bit manipulation allows the status of the di...

Страница 303: ...tput devices by overriding the I O scan An input bit can be forced on or off regardless of the actual state of the corresponding input device However forcing an output terminal will cause the correspo...

Страница 304: ...erminal or processor is disconnected or loses AC power or the MODE SELECT key is pressed all force functions are cleared WARNING When an energized output is being forced off keep personnel away from t...

Страница 305: ...ruction position the cursor on it and press REMOVE T END To enter a rung after the T END instruction press and then enter the new rung If the key is not pressed the rung will be inserted above the T E...

Страница 306: ...hard copy printout of the program A decision must be made either to replace the error with its correct instruction see Section 4 4 4 Changing an Instruction or to remove it The ERR message due to an...

Страница 307: ...dge one shot is used to set a bit on for one scan when the input condition has made a false true transition The transition represents the leading edge of the input pulse The programming for a leading...

Страница 308: ...ts the trailing edge of the input pulse Programming for a trailing edge one shot is shown in Figure 19 2 Figure 19 2 Trailing Edge One Shot Input Pulse Bit 112 04 One shot Bit Bit 203 00 04 112 00 App...

Страница 309: ...ressing serves two purposes it links a hardware terminal to a data table location input and it links a data table location to a terminal output In Figure A 1 reading from left to right the first numbe...

Страница 310: ...ample The PLC 2 family processors at the appropriate series and revision level can address module groups in various addressing modes The term addressing mode refers to the method of hardware addressin...

Страница 311: ...stall either 8 point standard density or 16 point high density used in complementary mode determines the number of bits in the words that are used You select 2 slot addressing by setting two switches...

Страница 312: ...full word of the input image table 2 slot I O Group Input Terminals Input Terminals 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Output image table word corresponding to the I O group unused Input...

Страница 313: ...utput Terminals 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Output image table word corresponding to the I O group Used Output bits Input image table word corresponding to the I O group 00 01 02 0...

Страница 314: ...05 06 07 10 11 12 13 14 15 16 17 Input Terminals Output Terminals 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Output image table word corresponding...

Страница 315: ...one I O group is assigned to the corresponding pair of words in the input and output image tables You assign one I O rack number to eight I O groups Figure A 5 Figure A 5 I O Table and Corresponding H...

Страница 316: ...See your scanner s or adapter s users manual for the specific switches and their settings The physical address of each I O group corresponds to an input and an output image table word The type of modu...

Страница 317: ...the I O group 17 16 15 14 04 03 02 01 00 Input image table word corresponding to the I O group 17 16 15 14 04 03 02 01 00 Input image table word corresponding to the I O group 1 slot I O Group OR The...

Страница 318: ...igit input or output instruction is associated with a particular I O module terminal Now with two I O racks you use the instruction address to identify which racks you are communicating with Figure A...

Страница 319: ...ules use the lower slave bus on the I O chassis backplane for intramodule communications When you select 1 2 slot addressing the processor by way of the adapter addresses one half of an I O module slo...

Страница 320: ...O module A 32 point I O module two 1 2 slot I O groups uses two input or two output words of the image table Module group 0 applies to the upper 16 points module group 1 applies to the lower 16 points...

Страница 321: ...I O Group 1 Bit Bit 01 03 05 07 11 13 15 17 01 03 05 07 11 13 15 17 00 02 04 06 10 12 14 16 00 02 04 10 12 14 16 17 10 7 0 Input Word 0 Image Table Words Allocated for I O Group 0 17 10 7 0 Outut Word...

Страница 322: ...ots Thus in a single 16 slot chassis you now can have four I O racks Figure A 10 Figure A 10 Assigning I O rack Numbers with 1 2 slot Addressing I O Group No 0 3 4 7 0 3 4 7 0 3 4 7 0 3 4 7 I O Groups...

Страница 323: ...y the lowest group number that it occupies and at slot 0 For example a one slot block transfer module in rack 1 group 2 and 3 chassis slot 2 would be addressed by Rack Group Slot at location 120 NOTE...

Страница 324: ...ot addressing See publication no 1772 2 18 for addressing information If you are communicating with a remote chassis through a 1771 ASB Series B remote I O Adapter module and the needed 1772 SD2 Remot...

Страница 325: ...771 ASB Series B 8 16 32 A C X A A C A A A Legend A Any mix of modules in the respective points per module category Specific module placement with 16 point input module in one slot of a slot pair and...

Страница 326: ...The value of a decimal number depends on the digits used and the place value of each digit Each place value in a decimal number represents a power of ten Figure B 1 starting with 100 The value of a de...

Страница 327: ...otcal number has a certain place value represented by a power of eight Figure B 2 The decimal value of an octal number is computed by multiplying each octal digit by its place value and adding these n...

Страница 328: ...nary number is computed by multiplying each binary digit by its corresponding place value and adding these numbers together By grouping several binary digits together values can be formed to represent...

Страница 329: ...represent a decimal number from 0 to 9 The place values for each group of 4 digits are 20 21 22 and 23 Table B A Figure B 4 Binary Coded Decimal 0 0 1 0 0 0 1 1 1 0 0 1 10 0 x 23 0 0 x 22 0 1 x 21 2...

Страница 330: ...numbers Binary coded octal BCO uses an arrangement of 8 bits one byte to represent a 3 digit octal number from 000 to 377 Figure B 5 The 8 bits are broken down into three groups 2 bits 3 bits and 3 bi...

Страница 331: ...B C Numbering System Conversion Chart Hexadecimal Binary Decimal Octal 0 1 2 3 4 5 6 7 8 9 A B C D E F 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 0 1 2 3 4 5 6 7 8...

Страница 332: ...ch hexadecimal digit represents 4 binary digits it is easy to convert a hexadecimal number to a binary number This is done by writing out the 4 bit pattern for each hexadecimal digit Figure B 7 Figure...

Страница 333: ...apses In other words the preset value represents a specific number of increments of the time base Note however that the preset value is not an absolute length of time For example if the preset value i...

Страница 334: ...preset value 100 This time interval will be greater than 0 99 seconds and less than or equal to 1 second as shown below 0 99 seconds TON timed out 1 0 second Note that special programming techniques a...

Страница 335: ...considerations later on You are urged not to overspecify timing accuracy In many applications timing within 0 1 second will provide accuracy comparable to or better than typical electromechanical tim...

Страница 336: ...used to operate sorting mechanisms for high speed machines Two methods can be used Method 1 The sort mechanism could be energized for example 60 msec after a reject is sensed by a particular sensor Me...

Страница 337: ...ion of Immediate Input and Immediate Output instructions can compensate for the length of scan time DC Output modules typically require from 1 to 5 msec for response AC Output modules require 3 to 10...

Страница 338: ...program scan The processor executes one program instruction at a time After it executes an instruction it cannot examine that instruction again until the next scan of memory With respect to timer inst...

Страница 339: ...r to compensate for the length of the scan time and to assure accurate timing 10 msec timer programming must be repeated several places in the program A typical program using the total memory can nomi...

Страница 340: ...hich examine the timed bit of the timer to condition an Output Energize instruction Immediate Input instructions to help assure that the timer is enabled as quickly as possible after the external even...

Страница 341: ...dressed to output image table word 014 will help to assure that the output modules respond quickly to timer cycling By repeating the timer instructions and related rungs you can assure that the proces...

Страница 342: ...ruction Execution Times Approximate 1 Instructions Time RTR GET BYTE 18 s L U CTR GET MCR 28 s PUT EQU LES LIMIT TEST 28 s 60 s TOF TON RTO CU CTD 83 s IMMEDIATE I O 105 s ZCL 130 s 1 These execution...

Страница 343: ...shift left 14 1 bit shift right 14 5 block length 10 5 10 17 block transfer 10 1 basic operation 10 1 block transfer instructions 10 4 branch instructions 4 9 buffering data 10 12 C capabilities 1 3 c...

Страница 344: ...ile XOR 16 5 file to word move 12 15 force on and force off functions 18 3 forced address display 18 4 fundamental operation 3 21 G get byte put instruction 6 8 get byte and limit test instructions 6...

Страница 345: ...cer output instruction 15 4 output instructions 4 5 output override and I O update instructions 7 1 output overrides 7 1 P peripheral functions 8 1 power up recovery 2 5 processor diagnostic indicator...

Страница 346: ...t instruction 15 3 sequencer table bit assignments 3 27 set shift bit 14 9 shift file down 13 5 shift file up 13 2 shift register instructions 13 1 special programming techniques 19 1 subroutine area...

Страница 347: ...00 Telex 43 11 016 FAX 414 382 2400 As a subsidiary of Rockwell International one of the world s largest technology companies Allen Bradley meets today s challenges of industrial automation with over...

Страница 348: ...service in house repair center WE BUY USED EQUIPMENT Sell your excess underutilized and idle used equipment We also offer credit for buy backs and trade ins www artisantg com WeBuyEquipment REMOTE IN...

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