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Chapter 

1

1-1

Introducing Block I/O

In this chapter, you will learn what analog block I/O is, its features, and
how it functions.

Block I/O consists of small, self-contained remote I/O devices complete
with power supply, programmable controller interface, input/output
connections and signal conditioning circuitry. Table 1.A is a list of block
I/O modules covered in this publication.

Table 1.A

Types of Block I/O

Catalog Number

Power Supply Voltage

Inputs Outputs

Description

1791N4V2

120V ac

4

2

analog - 4 input, 2 voltage output

1791N4C2

120V ac

4

2

analog - 4 input, 2 current output

1791NDV

24V dc

4

2

analog - 4 input, 2 voltage output

1791NDC

24V dc

4

2

analog - 4 input, 2 current output

The analog blocks are compatible with PLC-2

, PLC-3

, PLC-5/250

 and

PLC-5

 family programmable controllers, and the SLC

 5/02 (or greater)

modular controllers. Refer to the table below for information on using
block I/O with various Allen-Bradley programmable controllers.

If You are Using:

You must use:

PLC2 family programmable controller

1771SN subI/O scanner or

1772SD and SD2 remote I/O scanners

PLC3 family programmable controller
PLC5 family programmable controller

Block attaches directly to controller

PLC5/250 programmable controller

y

SLC 500 programmable controller

1747SN remote I/O scanner

The analog blocks communicate via block transfer or discrete transfer with
any Allen-Bradley programmable controller that connects to the remote
I/O network. The analog blocks communicate with SLC family controllers
using discrete transfer.

Each analog block has four independent inputs, which can be configured as
either all voltage inputs or all current inputs. The block contains a 24V dc
current limited voltage source for accommodating loop-powered current
transducer inputs.

Chapter Objectives

General Description

Содержание ALLEN-BRADLEY 1791

Страница 1: ...1791 Analog Block I O Input Output Modules User Manual...

Страница 2: ...lid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices which should be taken into considerati...

Страница 3: ...was not included in the previous release of this publication The modules are 1791 NDV 24V dc Analog Block I O voltage outputs 1791 NDC 24V dc Analog Block I O current outputs Updated Information Gener...

Страница 4: ...O 2 3 Connecting Wiring 2 4 Termination Resistor 2 13 Remote I O Link 2 13 Extended Node Capability 2 14 Compatibility of 1771 I O Products with Extended Node Numbers 2 15 Selecting Remote I O Link S...

Страница 5: ...Module 6 1 Chapter Objectives 6 1 Block Transfer Programming 6 1 PLC 3 Program Example 6 2 PLC 5 and PLC 5 250 Program Example 6 3 Sample Programs for Analog Block 6 4 PLC 3 Family Processors 6 4 PLC...

Страница 6: ...rview of the topics covered in that chapter Chapter Title Topics Covered 1 Introducing Block I O Description of the modules including general and hardware features 2 Installing Block I O Module power...

Страница 7: ...ac 4 2 analog 4 input 2 voltage output 1791 N4C2 120V ac 4 2 analog 4 input 2 current output 1791 NDV 24V dc 4 2 analog 4 input 2 voltage output 1791 NDC 24V dc 4 2 analog 4 input 2 current output Fo...

Страница 8: ...02 or greater modular controllers Refer to the table below for information on using block I O with various Allen Bradley programmable controllers If You are Using You must use PLC 2 family programmabl...

Страница 9: ...Terminal Strip for Input Output Remote I O and Power Connections Switch Assemblies POWER COMM FAULT 12631 I Terminal Strip Remote I O link power and input output connections are made to the removable...

Страница 10: ...k and the programmable controller using either block transfer or discrete transfer When using block transfer Figure 1 2 the block looks like a 1 4 I O rack to the processor two words of input image ta...

Страница 11: ...e daisy chained to a scanner 1747 SN Remote I O Scanner Module 10828 I 1 I O Rack Block I O each block is 1 2 I O rack 1 2 1 2 A simplified schematic of the input circuit of one input channel is shown...

Страница 12: ...able operation will occur The figures below show examples of differential input mode and single ended input mode 10V GND in0 RET in0 inI0 inV0 10V inV0 RETin0 GNDin0 inI0 Differential Input Mode Singl...

Страница 13: ...scale voltage NBS produces a count shown as input signal 4 For each range scale the input voltage which produces the ADC count of input signals 1 thru 5 in the above scale are shown below Input Signa...

Страница 14: ...ary counts scaling mode activates when the module powers up This mode guarantees the maximum resolution The module sets the scalers as shown in the following table Scaler 10V 0 10V 5V 0 5V Smax 8191 1...

Страница 15: ...ows how the five signals will be scaled using each of the three scaling methods In the user scaling column the Smax was set to represent 5000 and the Smin was set to represent 0 I t V l Scaling Method...

Страница 16: ...small as 1k ohm The output sacrifices a small amount of the resolution to provide a margin of 2 5 to allow for system or calibration inaccuracies as shown below 14 Bits 13 96 Bits Nominal Range Resol...

Страница 17: ...nal Binary Counts Scaling Default Scaling User Scaling Approx 10 25V 8395 10250 5062 10V 8191 10000 5000 Smax 0 000V 0000 00000 2500 10 00V 8192 10000 0000 Smin Approx 10 25V 8396 10250 0062 Current O...

Страница 18: ...ws this relationship Iout M x Module Data B where 20mA Smax Smin 20mA x Smax Smin M B Smax Smin You can choose one of three scaling methods binary counts default scaling user scaling User scaling is n...

Страница 19: ...2 16 blocks channel 28 blocks scanner 57 6K 10 000 cable feet 1772 SD 1772 SD2 16 blocks channel 28 blocks scanner with 150 ohm terminator 115 2K 5 000 cable feet Any PLC 3 scanner module 16 blocks ch...

Страница 20: ...terminator and extended node addressing 115 2K 5 000 cable feet PLC 5 family continued and extended node addressing 230 4K 2 500 cable feet 16 blocks channel 32 blocks per 57 6K 10 000 cable feet 16 b...

Страница 21: ...erminator3 230 4K 2 500 cable feet 1 PLC 5 15 series A and PLC 5 15 series B prior to revision H B H can only address 3 blocks 2 PLC 5 25 revisions prior to A D can only address 7 blocks 3Analog block...

Страница 22: ...7 5mm Block 12382 I Make wiring connections to the removable terminal block which plugs into the front of the block ATTENTION The terminal block is not keyed to prevent incorrect insertion If you rem...

Страница 23: ...g Connections for the Analog Block with Voltage Inputs Figure 2 6 page 2 6 Table 2 C page 2 10 120V ac Wiring Connections for the Analog Block with Figure 2 7 page 2 7 Table 2 D page 2 11 24V dc Wirin...

Страница 24: ...by connecting to user ground If an input channel floats outside of this range invalid input readings will result Figure 2 6 Wiring Connections for the 24V dc Analog Block with Voltage Input RIO 1 30 2...

Страница 25: ...Current Input Output ATTENTION The 249 ohm input current shunt is rated at 0 25 Watts Do not exceed this rating Figure 2 8 Wiring Connections for the 24V dc Analog Block with Current Input and Custom...

Страница 26: ...outside of this range invalid input readings will result 24V dc loop power supplied at terminal 25 on block Figure 2 10 Wiring Connections for the 24V dc Analog Block Module with Current Input and Bl...

Страница 27: ...t Return 0 through 3 10 14 18 22 inI0 thru inI3 Current Input 0 through 3 11 15 19 23 Current Input RET in0 thru RET in3 Input Return 0 through 3 10 14 18 22 Input Ground GNDin0 GNDin3 Channels 0 3 gr...

Страница 28: ...Input Return 0 through 3 10 14 18 22 inI0 thru inI3 Current Input 0 through 3 11 15 19 23 Current Input RET in0 thru RET in3 Input Return 0 through 3 10 14 18 22 Input Ground GNDin0 GNDin3 Channels 0...

Страница 29: ...t Return 0 through 3 10 14 18 22 inI0 thru inI3 Current Input 0 through 3 11 15 19 23 Current Input RET in0 thru RET in3 Input Return 0 through 3 10 14 18 22 Input Ground GNDin0 GNDin3 Channels 0 3 gr...

Страница 30: ...19 23 Current Input RET in0 thru RET in3 Input Return 0 through 3 10 14 18 22 Input Ground GNDin0 GNDin3 Channels 0 3 ground 12 16 20 243 Output out 0 RET out 0 Output 0 Return output 0 27 264 Output...

Страница 31: ...ocks must be wired in series as shown in Figure 2 12 or Figure 2 13 Do not attempt to wire any block in parallel The number of blocks used depends not only on the user requirements but also on the sys...

Страница 32: ...d and last block end The size of the terminator is determined by the system configuration Older system configurations must use a 150 ohm resistor at both ends With newer devices that can support it yo...

Страница 33: ...nts distance required and the type of remote I O devices being used Throughput Requirements Block throughput using analog block is dependent on the controllers data transfer rate Analog block outputs...

Страница 34: ...s addressing the block I O Each block I O module has two 8 position switches for setting starting I O group I O rack number communication rate last chassis last state block transfer discrete transfer...

Страница 35: ...lers Chapter 3 3 2 Figure 3 1 Switch Settings for the Analog Block I O Modules SW2 8 Not used SW2 7 Not Used SW2 6 Last I O Group 0 Not last rack 1 Last rack SW2 5 Processor Restart Lockout PRL 0 Proc...

Страница 36: ...1 0 0 1 Rack 12 Rack 12 Rack 12 0 0 1 0 1 0 Rack 13 Rack 13 Rack 13 0 0 1 0 1 1 Rack 14 Rack 14 Rack 14 0 0 1 1 0 0 Rack 15 Rack 15 Rack 15 0 0 1 1 0 1 Rack 16 Rack 16 Rack 16 0 0 1 1 1 0 Rack 17 Rack...

Страница 37: ...1 1 0 1 1 1 Rack 70 1 1 1 0 0 0 Rack 71 1 1 1 0 0 1 Rack 72 1 1 1 0 1 0 Rack 73 1 1 1 0 1 1 Rack 74 1 1 1 1 0 0 Rack 75 1 1 1 1 0 1 Rack 76 1 1 1 1 1 0 Not Valid 1 1 1 1 1 1 Rack address 77 is an ille...

Страница 38: ...with 4 blocks comprising 1 logical rack Image table usage for one assigned rack number is shown in Figure 3 3 Figure 3 2 I O Image Table for One Assigned Rack Number using Block Transfer Output Image...

Страница 39: ...mage table usage for one assigned rack number is shown in Figure 3 3 Figure 3 3 I O Image Table for One Assigned Rack Number using Discrete Transfer Output Image Input Image 0 1 2 3 4 5 6 7 0 17 0 1 2...

Страница 40: ...ler program length the amount of communication traffic to other modules on the remote I O network and the speed baud rate of the remote I O network Figure 3 4 Module Scan Time Relationships Ch 0 Ch 1...

Страница 41: ...l status and input data from the module The maximum BTR data file length required is five words 0 thru 4 The block transfer read data format consists of input data and module status Word 0 contains th...

Страница 42: ...scaling error 4 input channel 1 scaling error 5 input channel 2 scaling error 6 input channel 3 scaling error 7 channel 0 alarm error 8 channel 1 alarm error 9 channel 2 alarm error A channel 3 alarm...

Страница 43: ...Data 2 Output Channel 1 Data 3 Output Channel 0 Minimum Scaling 4 Output Channel 0 Maximum Scaling 5 Output Channel 1 Minimum Scaling 6 Output Channel 1 Maximum Scaling 7 Input Channel 0 Minimum Scal...

Страница 44: ...thru 6 for outputs and words 7 thru 14 for inputs Default Scaling Values are shown below Module Range Default Default Approximate Bits 10 11 12 13 Module Mode Bit 12 14 Bit 09 11 Bit 08 10 Default Mi...

Страница 45: ...d the input signal must go above the low alarm limit or below the high alarm limit by an amount equal to the specified deadband Alarm deadband values must be less than or equal to one half the differe...

Страница 46: ...an alarm condition to be removed the input signal must go above the low alarm limit or below the high alarm limit by an amount equal to the specified deadband Alarm deadband values must be less than...

Страница 47: ...ansfer programming moves data from the module to the processor s data table in one I O scan The processor I O scan initiates the request to transfer data from the module to the processor The input ima...

Страница 48: ...SLC configuration word is a subset of the PLC except an enable output bit is added alarms and user scaling are removed Words 1 and 2 contain output data Word 3 is reserved When using the analog block...

Страница 49: ...providing maximum possible resolution Default Scaling When this bit is set to 1 default scaling is in effect 1 user Default Scaling When this bit is set to 1 default scaling is in effect Module Mode R...

Страница 50: ...Time Bit Settings Filter Time Bit 03 Bit 02 Bit 01 Bit 00 Default no filter 0 0 0 0 Do not use 0 0 0 1 200ms 0 0 1 0 300ms 0 0 1 1 400ms 0 1 0 0 500ms 0 1 0 1 600ms 0 1 1 0 700ms 0 1 1 1 800ms 1 0 0 0...

Страница 51: ...configuring BTW because it does not configure the module each time it is initiated the output update BTW The following example programs are minimum programs all rungs and conditioning must be include...

Страница 52: ...used for both the read and write instructions for your module A different block transfer control file is required for every module A sample program segment with block transfer instructions is shown i...

Страница 53: ...N10 0 5 N ER BTR Enable 15 1 EN BTW BLOCK XFER WRITE RACK GROUP MODULE CONTROL 1 0 0 N7 5 DN DATA FILE LENGTH CONTINUOUS N10 10 27 N ER 2 BTW Enable 15 N7 5 N7 0 EN BTW BLOCK XFER WRITE RACK GROUP MO...

Страница 54: ...data and module status The following PLC 3 program can be altered to effectively address analog block modules Figure 6 3 PLC 3 Family Sample Program Structure EN BTR BLOCK XFER READ RACK GROUP MODULE...

Страница 55: ...gram Structure EN BTR BLOCK XFER READ RACK GROUP MODULE CONTROL X X X XXX XX DN DATA FILE LENGTH CONTINUOUS XXX XX 00 N ER BTR Enable 1 EN BTW BLOCK XFER WRITE RACK GROUP MODULE CONTROL X X X XXX XX D...

Страница 56: ...able to communicate with the processor and a programming terminal If the processor has block transfer capability you must enter ladder logic into the processor memory before calibrating the module You...

Страница 57: ...IM Bit 08 10 0 Use for voltage inputs Input scaling in mV Bit 08 10 1 Use for current inputs Input scaling in A Bits 9 10 11 12 Not used Bit 11 13 EEPROM write bit OK When set 1 requests the current c...

Страница 58: ...HL Indicates whether full scale or zero data point is being updated Bit 6 1 full scale Bit 6 0 zero data point Bit 07 Calibration Done bit DN When set 1 indicates calibration started and selected cha...

Страница 59: ...ata for Channel 2 using most recent calibration data 3 Corrected Input Data for Channel 3 using most recent calibration data Calibrating Voltage Inputs Use the procedure below to calibrate the voltage...

Страница 60: ...10 000V to the inputs you are calibrating 8 Set 1 the EX bit For PLC systems Monitor the DN bit BTR word 0 bit 07 until it is set 1 For SLC systems Allow at least 5 seconds before continuing 9 Verify...

Страница 61: ...you can calibrate them simultaneously Important To allow the module to stabilize energize the module for at least 30 minutes before calibrating To calibrate your module 1 Connect your test equipment f...

Страница 62: ...minal is in decimal radix mode Important Input values are scaled in microamps Vary the input reference over the 0 to 20 milliamps range Make sure the module input indications in the appropriate BTR wo...

Страница 63: ...ur test equipment for the output you want to calibrate This is shown in the figure below VO VRET Optional Load V 1791 N4V2 and 1791 NDV Important You can calibrate both outputs simultaneously 2 Verify...

Страница 64: ...t Output values are scaled in millivolts Vary the output value in the appropriate BTW words over the 10V range Make sure the meter indicates the outputs are within acceptable limits Repeat steps 3 9 i...

Страница 65: ...r the input you want to calibrate This is shown in the figure below IO IRET Optional Load A 1791 N4C2 and 1791 NDC Important You can calibrate both outputs simultaneously 2 Verify normal operation 3 S...

Страница 66: ...ut values are scaled in microamps Vary the output value in the appropriate BTW words over the 0 to 20 milliamp range Make sure the meter indicates the outputs are within acceptable limits Repeat steps...

Страница 67: ...and set BTW word 0 to C03Fh 4 Set the voltage source to 0 000V and set the terminal radix to decimal Enter the output meter reading in BTW words 1 and 2 5 Set the terminal radix to hexidecimal and se...

Страница 68: ...dicates whether communication is occurring between processor or scanner and the block module FAULT Red 1 Indicates hardware or software error and if communication has failed POWER Green 1 When on indi...

Страница 69: ...g received in Program mode FAULT OFF ON Flashing Normal Error hardware or software block power low COMM FAIL communication cable disconnected 100ms between valid frames no more than 255 valid frames b...

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Страница 78: ...ting block I O in a PLC system 1 3 1 4 connecting wiring 1791 IOBA 2 5 2 6 2 7 2 8 D default configuration 6 1 description 1 1 differential input mode 1 5 discrete data tranfer word bit assignments 5...

Страница 79: ...nges 1 4 series connections PLC 2 13 SLC 2 14 single ended input mode 1 5 specifications A 1 1791 N4C2 A 1 1791 N4V2 A 3 1791 NDC A 5 1791 NDV A 7 status indicators 1 2 8 1 switch assembly 1 2 T termi...

Страница 80: ...The Netherlands Turkey United Arab Emirates United Kingdom United States Uruguay Venezuela Yugoslavia World Headquarters Allen Bradley 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 200...

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