Allen-Bradley 1794ASB Series B User Manual
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Allen-Bradley 1794ASB Series B User Manual

Remote i/o adapter module
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Allen Bradley
Remote I/O
Adapter Module
(Cat. No. 1794 ASB Series B)
User
Manual

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Summary of Contents for Allen-Bradley 1794ASB Series B

  • Page 1 Allen Bradley User Remote I/O Adapter Module Manual (Cat. No. 1794 ASB Series B)
  • Page 2 Allen-Bradley 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 which should be taken into consideration when applying products such as those described in this publication.
  • Page 3 Summary of Changes This publication contains new and revised information not included in the last release. New Information Series A and Series B Differences The remote I/O adapter is now a series B. The series A adapters and the series B adapters process block transfers differently. Series A adapters allow block transfers to continue to occur even when an analog module is removed from its base.
  • Page 4 SOC–2 Summary of Changes I/O Mapping I/O mapping for the series B versions of the analog modules has been added. In addition, the 1794-IR8 and 1794-IT8 module I/O mapping is also included. Change Bars The areas in this manual which are different from previous editions are marked with change bars (as shown next to this paragraph) to indicate the addition of new or revised information.

  • Page 5: Table Of Contents

    Table of Contents Using This Manual ....... Preface Objectives ........Audience .
  • Page 6 Table of Contents Setting the Switches ........Starting I/O Group .
  • Page 7 Table of Contents Analog Input Module (1794 IE8/B) Write Configuration Block 3-11 Range Selection Bits for the 1794 IE8/B Analog Input Module 3-12 4 Output Analog Module (Cat. No. 1794 OE4 Series B) ..3-12 Analog Output Module (1794 OE4) Read .

  • Page 8: Specifications

    Preface Using This Manual Preface Objectives Read this preface to familiarize yourself with this manual and to learn how to use it properly and efficiently. Audience We assume that you have previously used an Allen–Bradley programmable controller, that you are familiar with its features, and that you are familiar with the terminology we use.

  • Page 9: Conventions

    P–2 Using This Manual Conventions We use these conventions in this manual: In this manual, we show: Like this: that there is more information about a topic in another chapter in this manual that there is more information about the topic in another manual More For Additional Information...

  • Page 10: Overview Of Flex I/O And Your Remote I/O Adapter Module

    Chapter Overview of FLEX I/O and your Remote I/O Adapter Module Chapter Objectives In this chapter, we tell you about: what the FLEX I/O system is and what it contains how FLEX I/O modules communicate with programmable controllers the features of your adapter module The FLEX I/O System FLEX I/O is a small, modular I/O system for distributed applications that performs all of the functions of rack-based I/O.

  • Page 11: How Flex I/O Modules Communicate With Programmable Controllers

    1–2 Overview of FLEX I/O and your Remote I/O Adapter Module How FLEX I/O Modules Data transfer to and from the remote I/O adapter/power supply and Communicate with discrete I/O modules occurs every flexbus scan. This provides the Programmable Controllers controller with updated data.

  • Page 12: Hardware Components

    Overview of FLEX I/O and your Remote I/O Adapter Module 1–3 Hardware Components The adapter module consists of the following major components: diagnostic indicators reset pushbutton remote I/O wiring connections 24V dc power wiring connections address/group switch assemblies Allen Bradley 24 VDC ADAPTER LOCAL...

  • Page 13: Reset Pushbutton

    1–4 Overview of FLEX I/O and your Remote I/O Adapter Module Reset Pushbutton Use the reset pushbutton to reset the adapter module and resume communication when a communication error occurs. (The adapter’s processor restart lockout switch (PRL) must be in the “locked out” position.) If the adapter is not locked out by the PRL switch, it will be automatically reset via special commands sent over the communication link.

  • Page 14: Installing Your Remote I/O Adapter Module

    Programmable 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 the following Allen-Bradley publications: Industrial Automation Wiring and Grounding Guidelines For Noise Immunity, publication 1770-4.1 Guidelines for Handling Lithium Batteries, publication AG-5.4...

  • Page 15: Power Requirements

    2–2 Installing Your Remote I/O Adapter Module Power Requirements The Remote I/O adapter module requires a current of 450mA at 24V dc from an external power supply for flexbus operation. This is sufficient to support the flexbus current requirements one logical rack (8 modules).

  • Page 16: Mounting On A Wall Or Panel

    Installing Your Remote I/O Adapter Module 2–3 Mounting on a Wall or Panel To mount the remote I/O adapter module on a wall or panel, you must have the 1794-NM1 mounting kit. The kit contains a special plate and screws necessary for wall/panel mounting. Proceed as follows: Install the mounting plate on a wall or panel as follows: 1.
  • Page 17 2–4 Installing Your Remote I/O Adapter Module (35.5) 1 - Adapter Mounting Plate 2 - Remote I/O Adapter Module Mounting Screws(18) - 2 for the mounting plate and 2 each for the 8 possible modules 4. Hold the adapter (2) at an angle and engage the top of the mounting plate in the indention on the rear of the adapter module.

  • Page 18: Wiring

    Installing Your Remote I/O Adapter Module 2–5 Wiring Connect external wiring to the remote I/O adapter as shown below. Allen Bradley 24 VDC ADAPTER LOCAL POWER SUPPLY ACTIVE FAULT FAULT RIO ADAPTER 1794-ASB 20131 SH 2 1. Connect the remote I/O cable to the removable plug-in remote I/O connector.

  • Page 19: Setting The Switches

    2–6 Installing Your Remote I/O Adapter Module Setting the Switches The remote I/O adapter module has two 8-position switch assemblies which you set for: starting I/O group I/O rack number hold inputs last chassis reply delay (always on) communication rate processor restart lockout (PRL) hold last state (outputs) Starting I/O Group...

  • Page 20: Communication Rate

    Installing Your Remote I/O Adapter Module 2–7 Communication Rate You set these switches (S2-3 and S2-4) for the desired communication rate (in bits/s). Selections are: 57.6k bits/s 115.2k bits/s 230.4k bits/s Processor Restart Lockout When PRL is disabled (switch S2-2 on), the programmable controller can restart communication with the adapter in the event of a communication fault.
  • Page 21 2–8 Installing Your Remote I/O Adapter Module Starting I/O Group S1-8 S1-7 Module group Starting I/O Group 0 (1st quarter) 2 (2nd quarter) I/O Rack 4 (3rd quarter) Number 6 (4th quarter) I/O Rack Number S1-6 thru S1-1 Flip open Refer to page 2-9 cover S2-8...
  • Page 22 Installing Your Remote I/O Adapter Module 2–9 Rack Number S1 Switch Position 1747 SN 1771 SN PLC 2 PLC 5 PLC 5/250 PLC 3 Rack 0 Rack 1 Rack 1 Not Valid Rack 0 Rack 0 Rack 1 Rack 2 Rack 2 Rack 1 Rack 1...
  • Page 23 2–10 Installing Your Remote I/O Adapter Module Publication 1794 6.5.3 - May 1996...

  • Page 24: Communicating With Flex I/O Modules

    Chapter Communicating with FLEX I/O Modules Chapter Objectives In this chapter, we tell you about: addressing your I/O what combination of I/O modules and I/O chassis you can use I/O image table usage Hardware Addressing Programmable controllers that use the remote I/O adapter module address their I/O in I/O groups.

  • Page 25: Determining Rack Size

    3–2 Communicating with FLEX I/O Modules I/O racks are made up of I/O groups. An I/O rack is an addressing unit that can contain up to eight I/O groups. You can use as many as 8 modules per adapter. This provides a maximum of 128 discrete I/O or 64 analog inputs, or 32 analog output channels.
  • Page 26 Communicating with FLEX I/O Modules 3–3 Some examples of rack definition are shown below. Example 1 - 4 Terminal Bases, 4 Modules Adapter Module Module Module Module = 1/2 Rack Each module is equal to 1 I/O group. Therefore, there are 4 I/O groups to be created. Four I/O groups equal 1/2 of a logical rack.

  • Page 27: Mapping Data Into The Image Tables

    3–4 Communicating with FLEX I/O Modules Mapping Data into the After the rack size has been determined by the remote I/O adapter, Image Tables the data from the modules must be mapped into the data tables. Mapping of data into the data table is different for discrete digital and analog modules.

  • Page 28: 16 Point Discrete Input Module Image Table Mapping - 1794 Ib16

    Communicating with FLEX I/O Modules 3–5 To see mapping for: Refer to: 16 Input Discrete Module (1794 IB16 page 16 Output Discrete Module (1794 OB16) page 8 Input Discrete Module (1794 IB8S) page 10 Input/6 Output Discrete Combo Module (1794 IB10XOB6) page 8 Input Discrete Module (1794 IA8) page...

  • Page 29: Point Discrete Output Module Image Table Mapping - 1794 Ob16

    3–6 Communicating with FLEX I/O Modules 16 point Discrete Output Module Image Table Mapping - 1794 OB16 Remote I/O Image Example Module Image Input Image Address Word n I:011 Not used Output Image O:011 Outputs Word n Memory Map of 16-Point Discrete Output Module Image Table – 1794-OB16 Decimal Bits (Octal Bits)

  • Page 30: Input Delay Times For The 1794 Ib8S Input Module

    Communicating with FLEX I/O Modules 3–7 Input Delay Times for the 1794-IB8S Input Module Bits Description Selected Delay Time for Inputs 00-11 (00-13) Delay Time Delay Time Delay Time for Inputs 12-15 (14-17) Delay Time 0 (default) 512µs Delay Time 1 Delay Time 2 Delay Time 3 Delay Time 4...

  • Page 31: Point Discrete Input Module Image Table Mapping - 1794 Ia8

    3–8 Communicating with FLEX I/O Modules 8 point Discrete Input Module Image Table Mapping - 1794 IA8 Remote I/O Image Example Input Image Module Image Address Word n Not used Inputs I:013 Output Image Delay O:013 Not used Word n Time Memory Map of 8-point Discrete Input Module Image Table –...

  • Page 32: Point Discrete Output Module Image Table Mapping - 1794 Oa8

    Communicating with FLEX I/O Modules 3–9 8 point Discrete Output Module Image Table Mapping - 1794 OA8 Remote I/O Image Module Image Example Input Image Address Not used I:014 Word n Output Image O:014 Word n Not used Outputs Memory Map of 8-Point Discrete Output Module Image Table – 1794-OA8 Decimal Bits (Octal Bits)

  • Page 33: Analog I/O Modules

    3–10 Communicating with FLEX I/O Modules Analog I/O Modules At powerup, the adapter identifies the type of module installed in the base unit. If the module is an analog module, the adapter will access 15 words of data. ATTENTION: If using Series A modules, do not use configure select and full range bit settings of 0.

  • Page 34: Input Analog Module (Cat. No. 1794 Ie8 Series B)

    Communicating with FLEX I/O Modules 3–11 8 Input Analog Module (Cat. No. 1794 IE8 Series B) Module Image Input Data Channel 0 Input Data Channel 1 I/O Image Input Data Channel 2 Input Size Input Data Channel 3 1 to 9 Words Read Input Data Channel 4 Input Data Channel 5...

  • Page 35: Range Selection Bits For The 1794 Ie8/B Analog Input Module

    3–12 Communicating with FLEX I/O Modules Range Selection Bits for the 1794-IE8/B Analog Input Module Channel No. Channel 0 Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Decimal Bits (Octal Bits) (10) (11) (12) (13) (14) (15)

  • Page 36: Analog Output Module (1794 Oe4/B) Write Configuration Block

    Communicating with FLEX I/O Modules 3–13 Analog Output Module (1794-OE4/B) Write Configuration Block Word/Dec. Bit Word/Octal Bit Write Word 0 Analog Data - Channel 0 Word 1 Analog Data - Channel 1 Word 2 Analog Data - Channel 2 Word 3 Analog Data - Channel 3 Word 4 Not used - set to 0...

  • Page 37: Input/2 Output Analog Combo Module (Cat. No. 1794 Ie4Xoe2 Series B)

    3–14 Communicating with FLEX I/O Modules 4 Input/2 Output Analog Combo Module (Cat. No. 1794 IE4XOE2 Series B) Module Image I/O Image Input Data Channel 0 Input Size Input Data Channel 1 0 to 5 Words Read Input Data Channel 2 Input Data Channel 3 Underrange &...

  • Page 38: Range Selection Bits For The 1794 Ie4Xoe2/B Analog Combo Module

    Communicating with FLEX I/O Modules 3–15 Word/Dec. Bit Word/Octal Bit Word 7 Safe State Value - Output Channel 1 Where: S = Sign bit (in 2's complement) M = Multiplex control C = Configure select bit F = Full range bit Range Selection Bits for the 1794-IE4XOE2/B Analog Combo Module Channel No.

  • Page 39: Rtd Input Module (1794 Ir8) Image Table Mapping

    3–16 Communicating with FLEX I/O Modules RTD Input Module (1794 IR8) Image Table Mapping Module Image Reserved Input Data Channel 0 Input Data Channel 1 I/O Image Input Data Channel 2 Input Size Input Data Channel 3 1 to 11 Words Read Input Data Channel 4 Input Data Channel 5...

  • Page 40: Rtd Analog Input Module (1794 Ir8) Write Words

    Communicating with FLEX I/O Modules 3–17 RTD Analog Input Module (1794-IR8) Write Words Decimal Bit Octal Bit Cal Hi Write Word 0 8 bit Calibration Mask Filter Cutoff Cal Lo RTD 3 Type RTD 2 Type RTD 1 Type RTD 0 Type RTD 7 Type RTD 6 Type RTD 5 Type...

  • Page 41: Thermocouple/Mv Input Module (1794 It8) Write

    3–18 Communicating with FLEX I/O Modules Decimal Bit Octal Bit Overrange Bits Underrange Bits Diagnostic Status Done Range Structure over Under Thermocouple/mV Input Module (1794-IT8) Write Dec. Bit Octal Bit Cal hi Write Word 0 8 Bit Calibration Mask Filter Cutoff Data Type Cal lo Thermocouple 3 Type...

  • Page 42: Troubleshooting

    Chapter Troubleshooting Chapter Objectives In this chapter, we tell you: about the indicators on the module front plate how to use the indicators for troubleshooting the module Fault Conditions Two conditions can cause the remote I/O adapter to declare a link (remote I/O) fault: no link activity for more than 100ms no commands issued to this address within the last 255 link...

  • Page 43: Remote I/O System Troubleshooting Guide

    4–2 Troubleshooting Table 4.A Remote I/O System Troubleshooting Guide Allen Bradley Local Fault Adapter Fault Adapter Active 24 VDC ADAPTER LOCAL POWER SUPPLY ACTIVE FAULT FAULT RIO ADAPTER 1794-ASB Communication States and Module Display Local Adapter Adapter Operating State Actions Fault Reset Fault Fault...

  • Page 44: Chapter Summary

    Troubleshooting 4–3 Additional Faults and Module Displays Local Adapter Adapter Fault Condition Actions Fault Reset Fault Fault Active Reset outputs. Stop Random Access Memory fault. communicating on remote I/O Cycle power. (This may not link. correct fault.) correct fault.) If this does not correct the fault, Read Only Memory fault (on Outputs remain reset.

  • Page 45: Specifications

    Appendix Specifications 1794 ASB Remote I/O Adapter I/O Capacity 8 modules Input Voltage Rating 24V dc nominal Input Voltage Range 19.2V to 31.2V dc (includes 5% ac ripple) Communication Rate 57.6k bps 115.2k bps 230.4k bps Indicators Adapter Active - green Adapter fault - red Local fault - red Flexbus Output Current...
  • Page 46 Index Symbols diagnostic indicators, **Empty**, P-2, 1-4, 2-10, 3-1, 3-2, 3-4, 3-16, 4-4, image table memory map 1794 IB16, 1794 IA8, adapter switch settings, 1794 IB10XOB6, addressing, I/O groups, 1794 IB8S, 1794 OA8, audience, 1794 OB16, 1794 OW8, indicators, input delay block transfer 1794 IA8, read,...
  • Page 47 Index I–2 remote I/O cable, connecting the wiring, switch settings, RTD analog input mapping, 1794 IR, 3-16 thermocouple input mapping, 1794 IT8, 3-17 troubleshooting guide, safe state values, 3-18 troubleshooting indicators, specifications,...
  • Page 48 Allen Bradley Publication Problem Report If you find a problem with our documentation, please complete and return this form.
  • Page 49 Remote I/O Adapter User Manual Pub. Name 1794 ASB/B 1794 6.5.3 May 1996 955122-64 Cat. No. Pub. No. Pub. Date Part No. Check Problem(s) Type: Describe Problem(s): Internal Use Only Technical Accuracy text illustration Completeness procedure/step illustration definition info in manual example guideline feature...
  • Page 50 Other Comments PLEASE FOLD HERE NO POSTAGE 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 TECHNICAL COMMUNICATION 1 ALLEN BRADLEY DR MAYFIELD HEIGHTS OH 44124-9705...

  • Page 51: Support Services

    Support Services Support Services At Allen-Bradley, customer service means experienced representatives at Customer Support Centers in key cities throughout the world for sales service and support. Our value-added services include: Technical Support SupportPlus programs telephone support and 24-hour emergency hotline...

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