Allen-Bradley 1794 Reference Manual
  1. Manuals
  2. Brands
  3. Allen-Bradley Manuals
  4. I/O Systems
  5. FlexLogix 1794
  6. Reference manual
Allen-Bradley 1794 Reference Manual

Allen-Bradley 1794 Reference Manual

Flex i/o system with controllogix for sil 2
Hide thumbs Also See for 1794:
Table of Contents

Quick Links

FLEX I/O System with ControlLogix for SIL 2
Catalog Number Bulletin 1794
Reference Manual
AB Drives
Table of Contents
loading

Related Manuals for Allen-Bradley 1794

Summary of Contents for Allen-Bradley 1794

  • Page 1 FLEX I/O System with ControlLogix for SIL 2 Catalog Number Bulletin 1794 Reference Manual AB Drives...
  • Page 2 Labels may be on or inside the equipment, such as a drive or motor, to alert people that surfaces may reach dangerous temperatures. Allen-Bradley, Rockwell Automation, FLEX I/O, RSLinx, RSLogix 5000 and TechConnect are trademarks of Rockwell Automation, Inc. Trademarks not belonging to Rockwell Automation are property of their respective companies.

  • Page 3: Sil Policy

    The ratio of the detected failure rate to the total Coverage failure rate. European Norm. The official European Standard Get System Value A ladder logic output instruction that retrieves AB Drives specified controller status information and places it in a destination tag. Publication 1794-RM001G-EN-P - December 2011...
  • Page 4 1oo2 One out of two A 1oo2 (one out of two) architecture consists of two channels connected in parallel such that either channel can process the safety function. Publication 1794-RM001G-EN-P - December 2011...

  • Page 5: Table Of Contents

    All of the examples related to I/O included in this manual are based on achieving de-energization as the safe state for typical Emergency Shutdown (ESD) Systems. AB Drives Publication 1794-RM001G-EN-P - December 2011...

  • Page 6: Sil2 Certification

    Other configurations are possible as long as they are SIL2 approved. Note 2: Two adapters are required for meeting SIL2 as shown in the figure. The adapters can be either ControlNet or Ethernet and must be from the list of approved products. Publication 1794-RM001G-EN-P - December 2011...

  • Page 7: Proof Tests

    • Testing of digital input or output channels to verify that they are not stuck in the ON or OFF state. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 8 If the proof test interval is changed, the information must be recalculated. For more information on system proof tests, see Publication 1756-RM001. For more information on the necessary I/O module, see Table 1.1. Publication 1794-RM001G-EN-P - December 2011...

  • Page 9: Sil2-Certified Flex I/O System Components

    Isolated Relay Output Module 1794-IN019 1794-OB8EPXT 8 Protected Output Module 1794-IN124 1794-IB16XT 16 Sink Input Module 1794-OB16PXT 16 Protected Output Module 1794-IB10XOB6XT 10 Input/6 Output Combo Module 1794-OW8XT 8 Relay Output Module 1794-IN019 AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 10 4 Isolated Output Analog I, I.x Module 1794-IF4ICFXT 4 Isolated Input Analog I, I.x 1794-IN130 Module 1794-IJ2XT 2 Ch. Frequency Counter E, E.x 1794-IN049 Module 1794-IRT8XT 8 TC/RTD Input Analog D, E, E.1, E.x 1794-IN050 Module Publication 1794-RM001G-EN-P - December 2011...
  • Page 11 The FW versions marked with extension .x (x can be 0 ... 99) are constitute to minor changes for enhancements. The test institute will be informed on any change. Users must use these series and firmware revisions for their application to be SIL2 certified. Firmware revisions are available by visiting http://support.rockwellautomation.com/ControlFlash/ These publications are available from Rockwell Automation by visiting http://literature.rockwellautomation.com. AB Drives Publication 1794-RM001G-EN-P - December 2011...

  • Page 12: Hardware Designs And Firmware Functions

    RTD Input Module 6,191,655 1.62E-07 2.87E-06 1794-IRT8 TC/RTD/mV Input Module 1,182,438 8.46E-07 1.56E-05 1794-IT8 Thermocouple Input Module 1,564,324 6.39E-07 1.17E-05 1794-OB16 16 Source Output Module 1,883,594 5.31E-07 9.62E-06 1794-OB16P Protected Output Module 2,135,280 4.68E-07 8.46E-06 Publication 1794-RM001G-EN-P - December 2011...
  • Page 13 2 Ch. Frequency Counter Module 11,714,128 8.54E-08 1.51E-06 1794-IRT8XT 8 TC/RTD Input Analog Module 8,204,792 1.22E-07 2.16E-06 MTBF measured in hours. Calculated using field-based values for components λ = Failure Rate = 1/MTBF AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 14 6.77E-08 4.78E-10 1794-IB16XT 16 Sink Input Module 35,587,189 2.81E-08 1.97E-10 1794-OB16PXT 16 Protected Output Module 26,709,401 3.74E-08 2.63E-10 1794-IB10XOB6XT 10 Input/6 Output Combo Module 22,202,487 4.50E-08 3.17E-10 1794-OW8XT 8 Relay Output Module 18,518,519 5.40E-08 3.80E-10 Publication 1794-RM001G-EN-P - December 2011...

  • Page 15: Publication 1794-Rm001G-En-P - December

    2.33E-04 1756-L63B 1756-CNB ControlNet Bridge Module 3,596,087 1.15E-04 1756-CNB ControlNet Bridge Module 3,596,087 1.15E-04 Total PFD calculation for a safety loop consisting of these products: 3.70E-04 1 See Publication 1756-RM001 for more information. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 16 1-12 SIL Policy 1794-ACNR15 (1) 1794-TB3 (1) 1794-OB16 1794-IB16 ControlNet 1794-ACNR15 (2) 1794-TB3 (2) 1794-OW8 1794-IB16 ControlNet Publication 1794-RM001G-EN-P - December 2011...

  • Page 17: Sil Compliance Distribution And Weight

    Each of the times listed above is variably dependent on factors such as the type of I/O module and instructions used in the ladder program. For examples of how to perform these calculations, see publication 1756-RM001. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 18 1-14 SIL Policy Notes: Publication 1794-RM001G-EN-P - December 2011...
  • Page 19 All modules independently verify proper transmission of the data. The EtherNet/IP bridge modules (1756-ENBT, 1756-EN2T, 1756-EN2TR, EtherNet/IP Bridge Module and 1756-EN2TXT) provide for the communications between ControlLogix and FLEX I/O system. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 20 Input tag of the associated adapter. The lower 8 bits of this tag correspond to the associated slot. For example, the tag "Node3:I.SlotlStatusBits" is defined as follows: NODE3 - This is the name given to the associated 1794-AVNR15. I = This indicates the Input file. Publication 1794-RM001G-EN-P - December 2011...
  • Page 21 Rockwell Automation publications listed in Table 2.1: Modules Documentation Table 2.1 Catalog Installation User Manual: Number: Description: Instructions: 1756-CNB ControlNet Communication 1756-IN571 CNET-UM001 Module 1756-CNBR Redundant ControlNet Communication Module These publications are available from Rockwell Automation at: http://literature.rockwellautomation.com. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 22 ControlLogix Communications Publication 1794-RM001G-EN-P - December 2011...
  • Page 23 61508 Standard. For example, the modules all have a common backplane interface, execute power-up and runtime diagnostics, and offer electronic keying. Table 1.1 lists the FLEX I/O modules initially submitted for SIL2 certification. AB Drives Publication 1794-RM001G-EN-P - December 2011...

  • Page 24: Using Digital Input Modules

    • The same controller must own both modules. • Monitor the ControlNet status bits for the associated module and ensure that appropriate action is invoked via the application logic by these status bits. Publication 1794-RM001G-EN-P - December 2011...

  • Page 25: Wiring Flex I/O Digital Input Modules

    Figure 3.3 Input A Input B Timer Input A Input B Timer preset in milliseconds to compensate for filter time and hardware delay differences. Timer Done Fault Fault Alarm to Operator AB Drives Publication 1794-RM001G-EN-P - December 2011...

  • Page 26: General Considerations When Using Any Flex I/O Digital Output Module

    • Test outputs at specific times to make sure they are operating properly. The method and frequency of testing is determined by the type of module. Publication 1794-RM001G-EN-P - December 2011...

  • Page 27: Wiring Flex I/O Digital Output Modules

    ControlLogix/FLEX I/O system. If a short circuit or fault SIL2 approved. occurs on output modules, the relay can disconnect power to the modules. An isolated relay output module (1794-OW8) can be used for 43363 this purpose when it is connected to a different 1794-ACN15 or -ACNR15 ControlNet Adapter module.
  • Page 28 3 4 5 6 7 8 9 10 11 12 13 14 15 +24V Output Actuator Output Note 1: An external relay can be replaced with an isolated relay module which is mounted in another FLEX I/O rail. 43364 Publication 1794-RM001G-EN-P - December 2011...

  • Page 29: Using Analog Input Modules

    High and Low limit of deviation. The second input channel is then compared to these limits to determine if the input are working properly. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 30 • Monitor the ControlNet status bits for the associated module and ensure that appropriate action is invoked via the application logic by these status bits. • Wire sensors to separate input channels on two separate modules that are on different ControlNet nodes. Publication 1794-RM001G-EN-P - December 2011...
  • Page 31 Figure 3.9 FLEX I/O Analog Input Module Wiring in Voltage Mode Analog Input Analog Input 1794-IE8 1794-IE8 1794-TB3 1794-TB3 Voltage Voltage Transmitter A Transmitter B Analog Input Analog Input 1794-IF4I 1794-IF4I 1794-TB3 1794-TB3 Voltage Voltage AB Drives Transmitter A Transmitter B Publication 1794-RM001G-EN-P - December 2011...
  • Page 32 (each module input is 250 ohms) 1794-IE8 Analog Input Analog Input 1794-IE8 1794-IE8 1794-TB3 1794-TB3 Current Current Source A Source B Analog Input Analog Input 1794-IF4I 1794-IF4I 1794-TB3 1794-TB3 Current Current Source B Source A Publication 1794-RM001G-EN-P - December 2011...
  • Page 33 Figure 3.10 FLEX I/O Analog Thermocouple Module Wiring Thermocouple Thermocouple 1794-IT8 1794-IT8 Input Module Input Module 1794-TB3T 1794-TB3T Thermocouple/ Thermocouple/ RTD/mV 1794-IRT8 RTD/mV 1794-IRT8 Input Module Input Module 1794-TB3G 1794-TB3G AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 34 1794-TB3T 1794-TB3T 3-Wire RTD Thermocouple/ Thermocouple/ RTD/mV RTD/mV 1794-IRT8 1794-IRT8 Input Module Input Module 1794-TB3G 1794-TB3G 4-Wire RTD Note: 2, 3, or 4-wire RTDs can be used as applicable to the associated RTD input module. Publication 1794-RM001G-EN-P - December 2011...
  • Page 35 For exceptions to the typical ESD applications, see publication 1756-RM001. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 36 Monitoring input Low Limit Delta High Limit Low Limit Outputs OK Output Echo High Limit Timer done Outputs Faulted Outputs Faulted Alarm to Operator The control, diagnostics and alarming functions must be performed in sequence. Publication 1794-RM001G-EN-P - December 2011...
  • Page 37 – Both modules use identical configuration. – The same controller owns both modules. • Monitor the ControlNet status bits for the associated module and ensure that appropriate action is invoked via the application logic by these status bits. AB Drives Publication 1794-RM001G-EN-P - December 2011...

  • Page 38: Isolated Analog

    Users must wire analog outputs to an actuator and then back to an analog input to monitor the output performance. 1794-OE4 1794-IE8 Analog Input Analog Output Module Module 1794-TB3 1794-TB3 V RET Actuator 1794-OF4I 1794-IF4I Isolated Analog Isolated Analog Input Module Output Module 1794-TB3 1794-TB3 V RET Actuator Publication 1794-RM001G-EN-P - December 2011...

  • Page 39: Output Module

    1794-OE4 1794-IE8 Analog Input Analog Output Module Module 1794-TB3 1794-TB3 Actuator 1794-OF4I 1794-IF4I Isolated Analog Isolated Analog Output Module Input Module 1794-TB3 1794-TB3 Actuator AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 40 When wiring FLEX I/O thermocouple modules in parallel, have you wired to the same channel on each module? When wiring two FLEX I/O RTD modules, are two sensors used? When two analog inputs are wired in the same application, are both modules on different ControlNet Nodes? Publication 1794-RM001G-EN-P - December 2011...
  • Page 41 When wiring the FLEX I/O analog output module in current mode, are loop devices placed properly? Have you written application logic to examine bits for any condition that may cause a fault and appropriate fault routines to handle the fault condition? AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 42 3-20 FLEX I/O Modules Notes: Publication 1794-RM001G-EN-P - December 2011...
  • Page 43 Chapter General Requirements for Application Software Refer to publication 1756-RM001, Using ControlLogix in SIL2 Applications. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 44 General Requirements for Application Software Notes: Publication 1794-RM001G-EN-P - December 2011...
  • Page 45 Chapter Technical SIL2 Requirements for the Application Program Refer to publication 1756-RM001 for Technical SIL2 Requirements for the application program. AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 46 Technical SIL2 Requirements for the Application Program Notes: Publication 1794-RM001G-EN-P - December 2011...

  • Page 47: Analog Output Module

    2.41E-07 73,096,226 1794-TB3TS Temperature Terminal Base Units 1.32E-08 2.32E-07 75,763,399 1794-TBN Terminal Base Units 75,716,615 1.32E-08 2.32E-07 1794-TBNF Fused Terminal Base Units 2.08E-07 3.70E-06 4,812,320 1794-ACNR15XT ControlNet Redundant Media Adapter 8,223,684 1.22E-07 2.15E-06 AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 48 Isolated Analog Input Module 11,746,343 8.51E-08 3.02E-06 1794-IJ2 Frequency Counter Module 2,418,321 4.14E-07 1.52E-05 1794-IP4 Pulse Counter Module 2,375,360 4.21E-07 1.55E-05 1794-IR8 RTD Input Module 6,191,655 1.62E-07 5.77E-06 1794-IRT8 TC/RTD/mV Input Module 1,182,438 8.46E-07 3.26E-05 Publication 1794-RM001G-EN-P - December 2011...
  • Page 49 2 Ch. Frequency Counter Module 11,714,128 8.54E-08 3.03E-06 1794-IRT8XT 8 TC/RTD Input Analog Module 8,204,792 1.22E-07 4.34E-06 MTBF measured in hours. Calculated using field-based values for components λ = Failure Rate = 1 / MTB AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 50 1.22E-07 1.10E-05 1794-AENTRXT 10/100Mb Ethernet Redundant Communication Adapter 1,268,070 7.89E-07 8.47E-05 1794-OB8EPXT 8 Protected Output Module 14,771,049 6.77E-08 6.05E-06 1794-IB16XT 16 Sink Input Module 35,587,189 2.81E-08 2.48E-06 1794-OB16PXT 16 Protected Output Module 26,709,401 3.74E-08 3.32E-06 Publication 1794-RM001G-EN-P - December 2011...
  • Page 51 TC/RTD/mV Input Module 1,182,438 8.46E-07 6.53E-09 1794-IT8 Thermocouple Input Module 1,564,324 6.39E-07 4.82E-09 1794-OB16 16 Source Output Module 1,883,594 5.31E-07 3.96E-09 1794-OB16P Protected Output Module 2,135,280 4.68E-07 3.47E09 AB Drives 1794-OB8EP Protected Output Module 4.18E-07 3.08E09 2,389,669 Publication 1794-RM001G-EN-P - December 2011...
  • Page 52 4 Isolated Output Analog Module 5,493,902 1.82E-07 1.30E-09 1794-IJ2XT 2 Ch. Frequency Counter Module 11,714,128 8.54E-08 6.04E-10 MTBF measured in hours. Calculated using field-based values for components λ = Failure Rate = 1 / MTBF Publication 1794-RM001G-EN-P - December 2011...
  • Page 53 1794-AENTRXT 10/100Mb Ethernet Redundant Communication Adapter 1,268,070 7.89E-07 6.58E-09 1794-OB8EPXT 8 Protected Output Module 14,771,049 6.77E-08 4.82E-10 1794-IB16XT 16 Sink Input Module 35,587,189 2.81E-08 1.98E-10 AB Drives 1794-OB16PXT 16 Protected Output Module 26,709,401 3.74E-08 2.64E-10 Publication 1794-RM001G-EN-P - December 2011...
  • Page 54 Pulse Counter Module 2,375,360 4.21E-07 3.70E-09 1794-IR8 RTD Input Module 6,191,655 1.62E-07 1.24E-09 1794-IRT8 TC/RTD/mV Input Module 1,182,438 8.46E-07 8.97E-09 1794-IT8 Thermocouple Input Module 1,564,324 6.39E-07 6.22E-09 1794-OB16 16 Source Output Module 1,883,594 5.31E-07 4.92E-09 Publication 1794-RM001G-EN-P - December 2011...
  • Page 55 2 Ch. Frequency Counter Module 11,714,128 8.54E-08 6.29E-10 1794-IRT8XT 8 TC/RTD Input Analog Module 8,204,792 1.22E-07 9.16E-10 MTBF measured in hours. Calculated using field-based values for components λ = Failure Rate = 1 / MTBF AB Drives Publication 1794-RM001G-EN-P - December 2011...
  • Page 56 A-10 Failure Estimates Notes: Publication 1794-RM001G-EN-P - December 2011...
  • Page 57 Analog input modules 3-13–3-15 Analog output modules 3-7, 3-13 Calibration Terminology 3-2–3-4 Digital input modules Preface-1 Used throughout manual Digital output modules 3-3, 3-4, 3-5, 3-7, 3-14 Fault reporting AB Drives 3-2, 3-4, 3-7, 3-13 Proof tests Publication 1794-RM001G-EN-P - December 2011...
  • Page 58 Index Wiring I/O modules Digital input modules 3-5, 3-6 3-9–3-15 Digital output modules Analog input modules 3-16–3-17 Analog output modules Publication 1794-RM001G-EN-P - December 2011...
  • Page 59 AB Drives...
  • Page 60 Rockwell Otomasyon Ticaret A.Ş., Kar Plaza İş Merkezi E Blok Kat:6 34752 İçerenköy, İstanbul, Tel: +90 (216) 5698400 Publication 1794-RM001G-EN-P - December 2011 Supersedes Publication 1794-RM001F-EN-P - September 2011 Copyright © 2011 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.

Table of Contents