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Allen-Bradley POINT I/O 1734-VHSC24, User Manual, Page: 21 / 64

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Allen-Bradley POINT I/O 1734-VHSC24 User Manual Download Page 21

Publication 1734-UM003A-EN-P - August 2000

About the Very High Speed Counter Modules        

1-13

Effect of ON-OFF  Value on Output Operation

Chapter Summary

In this chapter, you learned about the kinds of very high speed 
counter modules, and what modes they operate in. Read chapter 2 to 
install your counter module.

Effect of ON-OFF Value on Output Operation

Output turns ON

Output turns OFF

Output remains Energized

at count of 2000

for 3000 additional counts

 at count of 5000

Turn Off Value > Turn On Value

Output turns OFF

Output turns ON

Output remains Deenergized

at count of 2000

for 3000 additional counts

 at count of 5000

Turn On Value > Turn Off Value

Summary of Contents for POINT I/O 1734-VHSC24

Page 1: ...Very High Speed Counter Module Cat No 1734 VHSC5 and VHSC24 User Manual ...

Page 2: ...adley publication SGI 1 1 Safety Guidelines for the Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of t...

Page 3: ...ormation about See About the Very High Speed Counter Modules Chapter 1 Installing the Very High Speed Counter Module Chapter 2 Very High Speed Counter Module Input and Output Data Chapter 3 Configuring Your Very High Speed Counter Module Chapter 4 Accessing Instantiated Instances Chapter 5 Troubleshooting with the Indicators Chapter 6 Specifications Appendix A Description Cat No Publication POINT ...

Page 4: ...e Controllers Part 2 Equipment Requirements and Tests For specific information required by EN 61131 2 see the appropriate sections in this publication as well as Allen Bradley publication 1770 4 1 Industrial Automation Wiring and Grounding Guidelines Open style devices must be provided with environmental and safety protection by proper mounting in enclosures designed for specific application condi...

Page 5: ... input pulse to calculate an input frequency and verify it is above an error threshold This method does detect Lead Breakage since a broken wire will generate a 0Hz frequency Missing Pulse or Zero Frequency will also detect a customer device stuck high or low since the counter is monitoring for a change in the input state Currently the Counter Encoder Modes do not have Zero Frequency Detection the...

Page 6: ...734 UM003A EN P August 2000 Preface 4 Operational Mode Zero Frequency Detection Input Monitored Counter No None Encoder No None Period Rate Yes Z Only Continuous Rate Yes Z Only Rate Measurement Y A Only PWM No None ...

Page 7: ...ator 1 9 Default Configuration 1 9 Operating Mode Features 1 10 Operating Mode Features 1 10 Output Control 1 12 Chapter Summary 1 13 Installing the Very High Speed Counter Module General 2 1 Installing the Mounting Base Wiring Base Assembly 2 1 Installing an I O Module 2 2 Installing the Removable Terminal Block 2 4 Removing a Mounting Base 2 4 Wiring the 24V dc Very High Speed Counter Module 2 5...

Page 8: ...ds 12 to 19 3 10 Safe State Values Configuration Words 20 through 22 3 11 Communicating Real Time Non real Time Information 3 11 Configuring Your Very High Speed Counter Module Configuration Overview 4 1 Adding the Adapter to Your Network 4 1 Adding I O Modules to Your Network 4 2 Setting the Counter s Parameters 4 4 Checking I O Status and Viewing Editing the EDS File 4 6 Accessing Instantiated I...

Page 9: ... process signals on the terminal base and the PointBus containing the command information The three main functional blocks are the customer digital I O interface the counter ASIC and the microprocessor Functional Overview The Counter Module accepts feedback from encoders either single ended or differential pulse generators mechanical limit switches frequencies up to 1MHz A filter is available with...

Page 10: ...e period Continuous Rate Mode count internal clocks during the On period return a frequency Outputs are updated continuously during the period Rate Measurement Mode read pulses during the sample period return a frequency PWM Mode pulse width modulation generate a pulse width modulated signal The operation of the counter and encoder modes is nearly identical The difference between the two modes is ...

Page 11: ...re are two basic encoder types absolute and incremental A single output incremental encoder is called a tachometer encoder A dual channel incremental encoder with one channel leading the other by 90 is called a quadrature encoder A system using a quadrature encoder may include an optional zero pulse or index serving as a reference mark for system reset The principal disadvantage of a system using ...

Page 12: ... leading up direction OR trailing down direction edge of A for a bidirectional count and channel B is used to determine the direction B leads A Count Down B follows A Count Up X2 Multiplying Encoder Mode Quadrature input signals are used to count on leading AND trailing edges of A for a bidirectional count and channel B is used to determine the direction B leads A Count Down B follows A Count Up A...

Page 13: ...and total number of input pulses by counting the number of internal 5MHz clock pulses over a user specified number of input signal pulses At the end of the specified number of pulses the module returns the frequency 0 1MHz When the frequency is updated both outputs are checked against their associated presets EXAMPLE Example of Period Rate Mode A Not Used B Not Used Encoder Pulse Generator 1734 VH...

Page 14: ...coming input pulses have a 50 duty cycle Operation of Scalar In the Period Rate and Continuous Rate modes the scalar lets the incoming pulse train at the Z Gate Reset pin be divided by a user defined number There is one scalar value for each counter Acceptable values for the scalar are 1 2 4 8 16 32 64 and 128 The default value for each scalar is 1 Note that a 0 scalar is equivalent to a 1 The pro...

Page 15: ...unted the outputs dynamically track the 5MHz count EXAMPLE Example of Continuous Rate Mode As the frequency of the incoming pulse train at the Z Gate Reset terminal increases the number of sampled pulses from the 5MHz clock decreases Since accuracy is related to the number of pulses received over the sample period the accuracy will decrease with increasing frequencies at the Gate Reset terminal Re...

Page 16: ...th a default value of 1s Note that a 0 time period is equivalent to the 1s default EXAMPLE Example of Rate Measurement Mode Pulse Width Modulation PWM Mode The Pulse Width Modulation mode uses the counter to generate a continuous rolling sequence of numbers The real time PWM value written to the module is converted to a window edge so that a variable duty cycle signal can be generated The counter ...

Page 17: ...e programmed sample period in the Rate Measurement mode To use these bits reliably acquisition of data from the Counter Module must occur faster than the events which cause C1 C0 to increment When C1 C0 is updated a Change Of State COS message can be sent Default Configuration The module s default configuration on startup will be Counter Mode 50Hz filter on A B and Z No time base Active Output Ass...

Page 18: ...ored in the Read Data file The counter will continue counting The stored count will be available in the Stored Accumulated Count word The stored count information will remain until it is overwritten with new data Store Continue Operating Feature Counter Up Down Encoder X1 X2 X4 Period Rate Continuous Rate Rate Measurement PWM Preset Y Y N N N N Rollover Y Y N N N N Software Reset Y Y Y Y Y Y Store...

Page 19: ...ten with new data Store Wait Resume Store Count Mode 3 Store Reset Wait Start In mode 3 the rising edge of a pulse input on the Z Gate Reset terminal will stop counting read and store the current counter value in the Stored Accumulated Count word and reset the counter to zero The counter does not count while the input pulse on the Z Gate Reset terminal is high Counting resumes from zero on the fal...

Page 20: ...itten with new data Store Reset Start Output Control To connect an output to a compare window the user could program the module accordingly Tie Output 0 to Window 0 Program Window 0 ON Value to 2000 Program Window 0 OFF Value to 5000 ON OFF Operation of Output 0 If the OFF value is greater than the ON value the output turns ON at 2000 and OFF at 5000 If the ON value is greater than the OFF value t...

Page 21: ...dules and what modes they operate in Read chapter 2 to install your counter module Effect of ON OFF Value on Output Operation Output turns ON Output turns OFF Output remains Energized at count of 2000 for 3000 additional counts at count of 5000 TurnOff Value Turn On Value Output turns OFF Output turns ON Output remains Deenergized at count of 2000 for 3000 additional counts at count of 5000 TurnOn...

Page 22: ...Publication 1734 UM003A EN P August 2000 1 14 About the Very High Speed Counter Modules ...

Page 23: ...e address and it doesn t consume power from the PointBus To reduce loop area place module 2 adjacent either side to module 1 Installing the Mounting Base Wiring Base Assembly The wiring base assembly 1734 TB or TBS consists of a mounting base cat no 1734 MB and a removable terminal block cat no 1734 RTB or RTBS You can install the assembly or just the mounting base To install the mounting base wir...

Page 24: ...his procedure for the next mounting base assembly Installing an I O Module The module can be installed before or after base installation Make sure that the mounting base is correctly keyed before installing the module into the mounting base In addition make sure the mounting base locking screw is positioned horizontal referenced to the base 2 4 V D C S o u r c e O u t p u t M o d u l e S t a t u s...

Page 25: ...ion 2 2 Make certain the DIN rail locking screw is in the horizontal position You cannot insert the module if the locking mechanism is unlocked 3 Insert the module straight down into the mounting base and press to secure The module will lock into place Turn the keyswitch to align the number with the notch Notch position 3 shown Make sure the DIN rail locking screw is in the horizontal position 2 4...

Page 26: ...installed snap the RTB handle into place on the module Removing a Mounting Base To remove a mounting base you must remove any installed module and remove the removable terminal block if wired 1 Unlatch the RTB handle on the I O module 2 Pull on the RTB handle to remove the removable terminal block 3 Press in on the module lock on the top of the module and pull up on the I O module to remove from t...

Page 27: ...0 RET 4 Z 4 Vaux 5 Zret 5 Vaux 6 Out 0 6 Vaux 7 Out 1 7 Vaux 0 1 0 1 42016 Vaux Chassis Ground RET 0 RET 1 Vaux Vaux Chassis Ground Vaux Input Aret Input Bret Input Zret Out 1 Input A Input B Input Z Out 0 Status of Input Z Status of Output 0 Module Status Network Status Status of Input A Status of Input B Status of Output 1 Module 1 Module 2 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 A B Z Out 0 Vaux Chas G...

Page 28: ...34 UM003A EN P August 2000 2 6 Installing the Very High Speed Counter Module Chapter Summary In this chapter you learned how to install your module and mounting base assembly You also learned how to wire your module ...

Page 29: ...t Channel Data 32 bit Value of the present counter state Stored Channel Data 32 bit value of the stored accumulated count Status PE EF NR 0 FS FS OS OS 0 ZS BS AS C1 C0 ZD 0 Programming Error Code PE 0 0 0 0 E10 E9 E8 E7 E6 E5 E4 E3 E2 E1 E0 Output Information Counter Control 0 0 0 0 0 VR CP CR Output Control DS ES OE FO DS ES OE FO PWM Value 16 bit decimal value with range from 0 9500 0 95 00 Con...

Page 30: ...gate interval In period rate 5 and continuous rate 6 configurations it is the total accumulation of unscaled Z pulses i e if scaling is set to 128 after 128 Z pulses the accumulator will increase by 128 counts The maximum frequency that accumulation can follow in these two modes is 200Hz x scalar value ex 200Hz x 128 is 25kHz Finally in Scalar 8 bit value used to divide the Z input by 2n Output Ti...

Page 31: ...embly was chosen for poll consumption 0 105 or 106 are valid E9 The decimal point position is outside of acceptable range E8 Counter 0 window ON OFF values are equal and not zero OR Counter 0 window ON or OFF value greater than 0x00FFFFFF E7 A tie has been connected to an unprogrammed window E6 A configuration was selected that requires the scalar and none was programmed OR Multiple scalars were s...

Page 32: ...s B is ON 0 indicates B is OFF A input Status AS This bit indicates the present status of the A input 1 indicates A is ON 0 indicates A is OFF C 1 0 Stored data count This count cycles through 0 0 0 1 1 0 1 1 0 0 Each time the stored accumulated count words are updated C 1 0 is incremented This feature assumes the host s sample rate including network delay and program scan is as fast or faster tha...

Page 33: ... less than 8ms Bits 7 and 3 report output 1 and 0 respectively Electronic fuse Select ES When this bit is set 1 outputs will be disabled upon the detection of a fault short circuit or open wire and the output fault status indicator FS will be latched Recovery from a faulted state is achieved by sending ES 0 and OE 1 for the afflicted output When ES equals zero a faulted output will continue to ope...

Page 34: ...e output will depend on the turn on and turn off times of the MOSFET the energy storage capability of the cable load and the resistance from output to return Configuration Data The following represents the configuration data used by the 1734 VHSC24 module Counter Configuration Configuration Word 1 Use this byte to select the type of counter desired 07 06 05 04 03 02 01 00 ZI MD CF Counter 0 0 0 0 ...

Page 35: ...ssert the programming error PE bit Moving the decimal point to the left i e negative allows high frequencies commonly present in rate measurement mode to fit within a single 16 bit word Moving the decimal point to the right i e positive allows low frequencies commonly present in period and continuous rate modes to have resolution displayed to 0 1Hz and 0 01Hz Frequencies should be kept below 3 2kH...

Page 36: ...e Base Pulse Width Modulation PWM Period Configuration Word 5 This word sets the fundamental time base for the counter Its resolution is in milliseconds with minimum 10ms intervals i e an interval of 10 milliseconds is a value of 10 1 second is 1000 The maximum value that may be programmed is 3 seconds 3000 The time base must be entered when the PWM 3 and rate measurement 7 configurations are used...

Page 37: ...put 0 1 Ties Configuration Words 8 and 9 The bits in these two bytes connect the specified output to the appropriate compare window There are 4 windows associated with the counter Each output may be connected to any number of windows from 1 to all 4 The bits are defined as follows T0 Tie Output to 1st Compare Window also the PWM signal in PWM 3 configuration T1 Tie Output to 2nd Compare Window T2 ...

Page 38: ...is long word sets the preset value the counter will be loaded with when a Counter Preset CP command is issued Preset is a 32 bit number with a range of 0 value 0x00FFFFFF 16 777 215 Counter ON and OFF Windows Configuration Words 12 to 19 These long words program the four compare window s ON and OFF values The first compare window for each counter is utilized in PWM 3 configuration and when PWM is ...

Page 39: ...well as non real time module information i e description revision etc and configuration Assembly 101 is produced for a polled connection Assembly 102 is produced for a Change Of State COS connection Assemblies 103 104 107 and 108 are by Explicit message only Assemblies 105 and 106 are consumed in a polled connection as directed by parameter 4 Data may be read get or written set using an Explicit M...

Page 40: ...r Selection 1 Decimal Position 1 Active Output Assembly 1 Time Base or PWM Period 2 Gate Interval 1 Scalar 1 Output 0 Ties 1 Output 1 Ties 1 Rollover Value 4 Preset Value 4 ON Value 1 4 OFF Value 1 4 ON Value 2 4 OFF Value 2 4 ON Value 3 4 OFF Value 3 4 ON Value 4 4 OFF Value 4 4 PWM Safe State Value 2 Counter Control SSV 1 Output Control SSV 1 ...

Page 41: ... chapter shows configuration in the online mode Configuration screens appear similar in both modes The primary difference is that if you make changes offline you must go online before the configuration changes take effect Adding the Adapter to Your Network Follow these steps 1 Start the RSNetworx for DeviceNet software For more information about See page Configuration Overview 4 1 Adding the Adapt...

Page 42: ...s 63 You can change the setting by using the node commissioning tool The node commissioning tool is available either online or offline 1 Click here to expand the list of communication adapters 2 Double click here to choose the scanner You can also click and drag the scanner name onto the network Make sure you choose the 1734 ADN Point I O Scanner The scanner appears on the network IMPORTANT The sc...

Page 43: ...down your system before the change takes place 1 Go to the pulldown Tools Select Node Commissioning 2 Click on Browse 3 Select the module to change 4 The node commissioning screen returns It displays the node number and data rate 5 Change the node number and Apply The screen will then identify the new setting 6 Click on Close to continue 4 2 3 1 5 6 ...

Page 44: ...hown below and on the following pages These screens are for the 1734 VHSC24 module Identical screens are used for the 1734 VHSC5 module Refer to the screens below for an explanation of its features IMPORTANT This chapter shows configuration in the online mode Changes set in this mode take effect when you download to the individual module 1 Right click on the module 2 Click on Properties to configu...

Page 45: ...figuration parameters IMPORTANT If configuration changes are made in offline mode they do not take effect until the system goes online Click on the Device parameters tab to get to the screen for setting the parameters This screen appears after clicking on the Device parameters tab If you want the existing parameters uploaded from the module select Upload The following screen will then show the exi...

Page 46: ...figuration and modify the parameters as desired for your application When complete download to your module by clicking on the Download to Device button You can download each change as you make it using Single or download all your changes using All Click here when finished Click on the I O Defaults tab to display the default characteristics for this module This screen shows the input output default...

Page 47: ...ring Your Very High Speed Counter Module 4 7 Click on View File to view the actual EDS file shown at the left Click on the EDS File tab to display the statistics of the EDS file used to configure this You can view the actual EDS file or edit the file ...

Page 48: ...Publication 1734 UM003A EN P August 2000 4 8 Configuring Your Very High Speed Counter Module ...

Page 49: ...n the software The Very High Speed Counter Module uses several words to communicate real time input and output data as well as non real time module information i e description revision etc and configuration These words have been preprogrammed into Instantiated Instances Using Instantiated Instances Click on the module to select the Class Instance Editor Click on Yes when this screen appears ...

Page 50: ... look like this 1 Select the service code 3 Enter the class instance and attribute here 4 Click on Execute to initiate the action 2 Select the Receive Data size and radix 1 Type in the instance number here This is an example of assembly number 102 0x66 The class is always 4 and the attribute is always 3 2 Click on execute 3 Data received and status information is recorded here 4 Click on Close to ...

Page 51: ...a assembly 10110 6516 can be requested Data is ordered as followed byte 0 is the least significant byte 8 bit byte Byte 0 16 bit word Byte 0 byte 1 32 bit long word Byte 0 byte 1 byte 2 byte 3 In this example assembly 101 Service Class Instance Attribute 0E Get 04 Assembly 65 Present Data 03 Data Attribute Instances Services Field Bytes 101 0x65 Get Present Channel Data 4 Status 2 102 0x66 Get Sto...

Page 52: ...n 1 Decimal Position 1 Active Output Assembly 1 Time Base or PWM Period 2 Gate Interval 1 Scalar 1 Output 0 Ties 1 Output 1 Ties 1 Rollover Value 4 Preset Value 4 ON Value 1 4 OFF Value 1 4 ON Value 2 4 OFF Value 2 4 ON Value 3 4 OFF Value 3 4 ON Value 4 4 OFF Value 4 4 PWM Safe State Value 2 Counter Control SSV 1 Output Control SSV 1 ...

Page 53: ...Indication Probable Cause Module Status Off No power applied to device Green Device operating normally Flashing Green Device needs commissioning due to configuration missing incomplete or incorrect Flashing Red Recoverable fault Red Unrecoverable fault may require device replacement Flashing Red Green Device is in self test Module Status Network Status Status of Input A Status of Input B 0 1 Statu...

Page 54: ...communication device Device detected error that prevents it communicating on the network Flashing Red Green Communication faulted device the device has detected a network access error and is in communication faulted state Device has received and accepted an Identify Communication Faulted Request long protocol message Indication Probable Cause Input Status Off Input inactive Yellow Input is active ...

Page 55: ... 10 0ms Maximum Input Frequency 1 0MHz counter and encoder X1 configurations 500kHz encoder X2 configuration no filter 250kHz encoder X4 configuration no filter Output Specifications Number of Outputs 1 isolated group of 2 capable of 0 5A 24V dc Output Control Outputs can be tied to any of 4 compare windows Output Supply Voltage Range 10 28 8V dc OFF State Leakage Current 0 5mA ON State Voltage Dr...

Page 56: ...Vibration 20 to 55 C 4 to 131 F 40 to 85 C 40 to 185 F 5 to 95 noncondensing 30g peak acceleration 11 1 ms pulse width 50g peak acceleration 11 1 ms pulse width Tested 5g 10 500Hz per IEC 68 2 6 Conductors Wire Size Category 14 AWG 2 5mm2 22 AWG 0 25mm2 solid or stranded wire rated at 75 C or higher 3 64 inch 1 2mm insulation maximum 22 Terminal Base Screw Torque 7 pound inches 0 6Nm Field Wiring ...

Page 57: ...State Voltage 2 6V dc Maximum ON State Voltage 6V Input Filter Selections Off 10µs 100µs 1 0ms 10 0ms Maximum Input Frequency 1 0MHz counter and encoder X1 configurations 500kHz encoder X2 configuration no filter 250kHz encoder X4 configuration no filter Output Specifications Number of Outputs 1 isolated group of 2 capable of 0 5A 24V dc Output Control Outputs can be tied to any of 4 compare windo...

Page 58: ...n 20 to 55 C 4 to 131 F 40 to 85 C 40 to 185 F 5 to 95 noncondensing 30g peak acceleration 11 1 ms pulse width 50g peak acceleration 11 1 ms pulse width Tested 5g 10 500Hz per IEC 68 2 6 Conductors Wire Size Category 14 AWG 2 5mm2 22 AWG 0 25mm2 solid or stranded wire rated at 75 C or higher 3 64 inch 1 2mm insulation maximum 22 Terminal Base Screw Torque 7 pound inches 0 6Nm Field Wiring Terminat...

Page 59: ...ter selection 3 7 filter settings 1 1 format data table 3 1 G gate interval setting 3 8 I indicators 6 1 input status indicator 6 2 input voltage range 1 1 input word present channel data 3 2 installation module 2 2 installation wiring base assembly 2 1 installation module 2 2 installation removable terminal block 2 4 K keyswitch position 2 3 M modes of operation 1 2 module installation 2 2 module...

Page 60: ... 2 4 S safe state configuration 3 11 scalar 3 9 scalar operation 1 6 scalar selection 3 9 selecting a filter 3 7 selecting counter type 3 6 selecting the scalar setting 3 9 setting module parameters 4 4 setting rollover counts 3 10 setting safe state values 3 11 setting the compare windows 3 10 setting the counter gate interval 3 8 setting the preset value 3 10 specifications 1734 VHSC5 A 3 specif...

Page 61: ...Problem s Type Describe Problem s Internal Use Only Technical Accuracy text illustration Completeness procedure step illustration definition info in manual What information is missing example guideline feature accessibility explanation other info not in manual Clarity What is unclear Sequence What is not in the right order Other Comments Use back for more comments Your Name Location Phone Return t...

Page 62: ...E NECESSARY IF MAILED IN THE UNITED STATES BUSINESS REPLY MAIL FIRST CLASS MAIL PERMIT NO 18235 CLEVELAND OH POSTAGE WILL BE PAID BY THE ADDRESSEE 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124 9705 PLEASE FASTEN HERE DO NOT STAPLE PLEASE REMOVE ...

Page 63: ......

Page 64: ...Publication 1734 UM003A EN P August 2000 6 PN 957293 30 2000 Rockwell International Corporation Printed in the U S A Back Cover ...

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