Rockwell Automation 1794-ASBE User Manual

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Important User Information

Because of the variety of uses for the products described in this publication, those responsible for the application and use of these products must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards. In no event will Rockwell Automation be responsible or liable for indirect or consequential damage resulting from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples shown in this publication are intended solely for purposes of example. Since there are many variables and requirements associated with any particular installation, Rockwell Automation does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

Allen–Bradley publication SGI–1.1, Safety Guidelines for Application, Installation, and Maintenance of Solid–State Control (available from your local Rockwell Automation 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 this copyrighted publication, in whole or part, without written permission of Rockwell Automation, is prohibited.

Throughout this publication, notes may be used to make you aware of safety considerations. The following annotations and their accompanying statements help you to identify a potential hazard. avoid a potential hazard, and recognize the consequences of a potential hazard.

WARNING

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

ATTENTION

Identifies information about practices or circumstances that may lead to personal injury or death, property damage, or economic loss.

Identifies information that is critical for

IMPORTANT

successful application and understanding of the product.

ATTENTION

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664–1), at altitudes up to 2000 meters without derating.

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

This equipment is supplied as “open type” equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present, and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

ATTENTION

See NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosures. Also, see the appropriate sections in this publication, as well as the Allen–Bradley publication 1770–4.1, (“Industrial Automation Wiring and Grounding Guidelines”), for additional installation requirements pertaining to this equipment.

FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc plated, yellow chromated steel DIN rail to assure proper grounding. Using other DIN rail material (e.g. aluminum, plastic, etc.) which can corrode, oxidize or are poor conductors can result in improper or intermittent platform grounding.



ATTENTION

Preventing Electrostatic Damage This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment.

• Touch a grounded object to discharge potential

static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component

boards.

• Do not touch components inside the equipment.

• If available, use a static–safe workstation.

• When not in use, keep modules in appropriate

static–safe packing.

  

The information below summarizes the changes to the Remote I/O Adapter User Manual, publication 1794-UM009D–EN–P, since the last release.

The series E adapter is capable of recognizing the safe state data for the FLEX Integra analog modules, and allows use of 32 point FLEX I/O modules. You must use a series D or later adapter when using FLEX Integra analog modules in your system.

New Information

The following new information is included in this version of the publication:

Corrected Switch Positions

Switch positions on S! and S2 were incorrectly identified in the previous version of this publication. Corrections have been made on page 2–11 of Chapter 2.

Additional FLEX I/O Modules

New modules available since the last version of this publication have been added.

Change Bars

The areas in this manual which are different from previous editions are marked with change bars (as shown to the right of this paragraph) to indicate the addition of new or revised information.

Publication 1794ĆUM009D-EN-P - April 2004

soc–ii Summary of Changes

Publication 1794ĆUM009D-EN-P - April 2004

Using This Manual

Preface

Preface Objectives

Audience

Vocabulary

Read this preface to familiarize yourself with this manual and to learn how to use it properly and efficiently.

Important:

You must use a series D or later adapter to

IMPORTAN

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. If not, read the user manual for your processor before reading this manual.

In this manual, we refer to:

communicate with FLEX Integra analog modules. You must use a series E or later adapter to communicate with 32 point FLEX modules.

• the individual adapter module as the “adapter.”

• the programmable controller as the “controller” or the

“processor.”

• input and output modules as the “module.”

What This Manual Contains

The contents of this manual are as follows:

Table P. A What This Manual Contains

Chapter Title What's Covered

2 Installing Your Remote I/O Adapter Procedures and guidelines for installing the module

3 Communicating with FLEX I/O Modules Hardware addressing and configuration options

4 Troubleshooting Troubleshooting aids

Appendix Title What's Covered

A Specifications Module specifications

C Safety Approvals

Overview of FLEX I/O and the Remote I/O Adapter Module

Differences Between Series A, B, C, D and E Remote I/O Adapters

Describes features, capabilities, and hardware components.

Publication 1794ĆUM009D-EN-P - April 2004

Using This ManualP–2

Catalog

Conventions

For Additional Information

1794ĆACNR 24V dc Redundant Media ControlNet Adapter

1794ĆACN15 24V dc ControlNet Adapter

1794ĆACNR15 24V dc Redundant Media ControlNet Adapter

1794ĆASB/E 24V dc Remote I/O Adapter 1794ĆIN046 1794ĆUM009

1794ĆASB2/D 24V dc 2ĆSlot Remote I/O Adapter 1794ĆIN044 1794ĆUM059

1794ĆOB16P 24V dc 16 Source Output Module

1794ĆOB32P 24V dc 32 Electronically Fused Output Module

1794ĆOB8EP 24V dc 8 Electronically Fused Output Module

1794ĆOV16P 24V dc 16 Electronically Fused Output Module

1794ĆIB10XOB6 24V dc 10 Input/6 Output Module

1794ĆIB16XOB16P 24V dc 16 Input/16 Output Module

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

For additional information on FLEX I/O systems and modules, refer to the following documents:

Publications

Number

1794 1794 FLEX I/O Product Data

1794ĆACN 24V dc ControlNet Adapter

1794ĆADN 24V dc DeviceNet Adapter 1794Ć5.14 1794Ć6.5.5

1794ĆAPB 24V dc Profibus Adapter 1794ĆIN040 1794ĆUM057

1794ĆIB8 24V dc 8 Sink Input Module

1794ĆOB8 24V dc 8 Source Output Module

1794ĆIB16 24V dc 16 Sink Input Module

1794ĆIB32 24V dc 16 Source Output Module

1794ĆOB16 24V dc 16 Source Output Module

1794ĆIV16 24V dc 16 Source Input Module

1794ĆOV16 24V dc 16 Sink Output Module

1794ĆIB8S 24V dc Sensor Input Module

Voltage Description

Table continued on next page

Installation

Instructions

1794Ć2.1

1794Ć5.8

1794Ć5.18

1794Ć5.47

1794Ć5.48

1794Ć5.30

1794Ć5.31

1794ĆIN072

1794ĆIN084

1794Ć5.3

1794Ć5.45

1794ĆIN090

1794Ć5.28

1794Ć5.29

1794Ć5.20

1794Ć5.52

1794Ć5.7

1794Ć5.24

1794ĆIN083

User

Manual

Publication 1794ĆUM009D-EN-P - April 2004

Using This Manual P–3

Catalog

Catalog Number

Number

DescriptionVoltage

Publications

Installation

Instructions

User

Manual

1794ĆOW8 24V dc 8 Relay Output Module 1794Ć5.19

1794ĆIE8 24V dc Selectable Analog 8 Input Module

1794ĆOE4 24V dc Selectable Analog 4 Output Module

1794ĆIE4XOE2 24V dc 4 Input/2 Output Analog Module

1794ĆOF4I 24V dc 4 Output Isolated Analog Module

1794ĆIF4I 24V dc 4 Input Isolated Analog Module

1794ĆIF2XOF2I 24V dc 2 Input/2 Output Isolated Analog Module

1794Ć5.6

1794Ć5.5

1794Ć5.15

1794Ć5.37

1794Ć5.38

1794Ć5.39

1794Ć6.5.2

1794Ć6.5.8

1794ĆIR8 24V dc 8 RTD Input Analog Module 1794Ć5.22 1794Ć6.5.4

1794ĆIT8 24V dc 8 Thermocouple Input Module 1794Ć5.21 1794Ć6.5.7

1794ĆIRT8 24V dc 8 Thermocouple/RTD Input Module 1794Ć5.50 1794Ć6.5.12

1794ĆIJ2 24V dc 2 Frequency Input Module 1794Ć5.49 1794Ć6.5.11

1794ĆID2 24V dc 2 Channel Frequency Input Module 1794Ć5.63 1794Ć6.5.15

1794ĆIP4 24V dc 2 Channel Pulse Counter Module 1794Ć5.64 1794Ć6.5.16

1794ĆHSC 24V dc High Speed Counter Module 1794Ć5.67 1794Ć6.5.10

1794ĆIC16 48V dc 48V dc 16 Input Module

1794ĆOC16 48V dc 48V dc Output Module

1794ĆIA8 120V ac 8 Input Module

1794ĆOA8 120V ac 8 Output Module

1794ĆIA8I 120V ac Isolated 8 Input Module

1794ĆOA8I 120V ac Isolated Output Module

1794ĆIA16 120V ac 16 Input Module

1794ĆOA16 120V ac 16 Output Module

1794ĆIM8 220V

8 Input Module

ac/dc

1794ĆOM8 220V

8 Output Module

ac/dc

1794ĆTB2 1794ĆTB3

2Ćwire Terminal Base 3Ćwire Terminal Base

1794ĆTBN Terminal Base Unit

1794ĆTBNF Fused Terminal Base Unit

1794ĆTB3T Temperature Terminal Base Unit

1794ĆTB3S Spring Clamp Terminal Base Unit

1794ĆTB3TS Spring Clamp Temperature Base Unit

1794ĆTB3G Terminal Base Unit

1794ĆTB3GS Spring Clamp Terminal Base Unit

1794ĆTB32 Cage Clamp Terminal Base Unit

1794ĆTB32S Spring Clamp Terminal Base Unit

1794Ć5.53

1794Ć5.54

1794Ć5.9

1794Ć5.10

1794Ć5.55

1794Ć5.56

1794Ć5.60

1794Ć5.61

1794Ć5.57

1794Ć5.58

1794ĆIN070

1794ĆIN016

1794Ć5.17

1794Ć5.41

1794Ć5.42

1794Ć5.43

1794Ć5.51

1794Ć5.59

1794ĆIN085

Table continued on next page

Publication 1794ĆUM009D-EN-P - April 2004

Using This ManualP–4

Catalog

Catalog Number

Number

1794ĆCE1, ĆCE3 Extender Cables

1794ĆNM1 Mounting Kit

1794ĆPS13 24V dc Power Supply

1794ĆPS3 24V dc Power Supply

1797ĆIBN16 See note 16 NAMUR Digital Input Module 1794ĆIN072

1797ĆOB4D See note 4 NI, Ex Source Digital Output Module 1794Ć5.6

1797ĆIE8 See note 8 Selectable Input Module 1794Ć5.5

1797ĆIE8NF See note 8 Selectable Filter Analog Input Module 1794Ć5.31

1797ĆOE4 See note Selectable Analog 4 Output Module 1794Ć5.3

1797ĆIRT8 See note 8 Thermocouple/RTD Input Module 1794Ć5.4

1797ĆIJ2 See note 2 Frequency Input Module 1794Ć5.9

1797ĆTB3

1797ĆTB3S

1797ĆBIC See note I.S. Bus Isolator 1797Ć5.13

1797ĆCEC See note FLEX Ex Bus Connector 1797Ć5.13

Note: Intrinsically Safe Voltage

3Ćwire Screw Clamp Terminal Base 3Ćwire Spring Clamp Terminal Base

DescriptionVoltage

FLEX Ex

Installation

Instructions

1794Ć5.12

1794Ć5.13

1794Ć5.35

1794Ć5.71

1797Ć5.1 1797Ć5.2

Publications

User

Manual

ATTENTION

FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc plated, yellow chromated steel DIN rail to assure proper grounding. Using other DIN rail materials (e.g. aluminum, plastic, etc.) which can corrode, oxidize or are poor conductors can result in improper or intermittent platform grounding.

Publication 1794ĆUM009D-EN-P - April 2004

Using This Manual P–5

ATTENTION

WARNING

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential

static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component

boards.

• Do not touch circuit components inside the

equipment.

• If available, use a static–safe workstation.

• When not in use, keep modules in appropriate

static–safe packaging.

Remove field-side power before removing or inserting this module. This module is designed so you can remove and insert it under backplane power. When you remove or insert a module with field-side power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:

• sending an erroneous signal to your system’s

field devices causing unintended machine motion

• causing an explosion in a hazardous environment

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance.

Publication 1794ĆUM009D-EN-P - April 2004

Using This ManualP–6



This preface gave you information on how to use this manual efficiently. The next chapter introduces you to the remote I/O adapter module.

Publication 1794ĆUM009D-EN-P - April 2004

Table of Contents

Overview of FLEX I/O and your Remote I/O Adapter Module

Installing Your Remote I/O Adapter Module

Chapter 1

Chapter Objectives 1-1...................................

The FLEX I/O System 1-1.................................

How FLEX I/O Modules Communicate with Programmable Controllers 1-2

Hardware Components 1-3................................

Diagnostic Indicators 1-3................................

Reset Pushbutton 1-4..................................

Remote I/O Wiring 1-4..................................

Power Wiring 1-4......................................

Address Switch Assemblies 1-4...........................

Chapter Summary 1-4....................................

Chapter 2

Chapter Objectives 2-1...................................

Power Requirements 2-3..................................

Mounting the Remote I/O Adapter 2-3.........................

Mounting on a DIN Rail before installing the terminal base units 2-3..

Mounting (or Replacing) the Adapter on an Existing System 2-4....

Mounting on a Wall or Panel 2-5...........................

Wiring 2-7.............................................

Setting the Switches 2-8..................................

Starting I/O Group 2-8..................................

I/O Rack Number 2-8...................................

Hold Inputs 2-8.......................................

Rack Fault Select Switch (RFS) 2-9........................

Addressing Mode Selection Switches 2-9....................

Communication Rate 2-10................................

Processor Restart Lockout (PRL) 2-10.......................

Hold Last State (HLS) 2-10...............................

Setting the Mode Selection Switches 2-12.......................

Setting the Address Switches 2-13............................

Setting the Address Switches for Complementary I/O 2-15...........

Primary Rack 2-15.....................................

Complementary Rack 2-15................................

Chapter Summary 2-15....................................

Communicating with FLEX I/O Modules

Chapter 3

Chapter Objectives 3-1...................................

FLEX I/O Module Data 3-1.................................

Addressing I/O 3-2......................................

Analog (Block Transfer) Modules 3-5.........................

Publication 1794ĆUM009D-EN-P - April 2004

Table of Contentsii

Standard Addressing 3-6..................................

Standard - 32 Addressing 3-7..............................

Compact Addressing 3-8..................................

Compact Mode 3-8....................................

Complementary Addressing Mode 3-12........................

Complementary Mode - 16Ćpoint 3-12.......................

Complementary Mode - 8Ćpoint 3-13........................

Complementary - 32 Addressing 3-15.........................

Mapping Data into the Image Tables 3-16.......................

Determining Rack Size 3-16.................................

Operating Modes 3-18.....................................

Chapter Summary 3-18....................................

Troubleshooting

Specifications

Differences Between Remote I/O Adapter Series A, B, C, D and E

Safety Approvals

Chapter 4

Chapter Objectives 4-1...................................

Fault Conditions 4-1.....................................

Troubleshooting with the Indicator Lights 4-1....................

Chapter Summary 4-3....................................

Appendix A

Specifications A-1.......................................

Appendix B

Differences Between Remote I/O Adapter Series A, B, C, D and E B-1..

Appendix C

Safety Approvals C-1.....................................

Publication 1794ĆUM009D-EN-P - April 2004

 

Overview of FLEX I/O and your Remote I/O Adapter Module

Chapter Objectives

The FLEX I/O System

Adapter

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

FLEX I/O is a small, modular I/O system for distributed applications that performs all of the functions of rack-based I/O. The FLEX I/O system contains the following components shown below:

Terminal Base

I/O Module

20125

• adapter/power supply – powers the internal logic for as many as

eight I/O modules

• terminal base – contains a terminal strip to terminate wiring for

two- or three-wire devices

• I/O module – contains the bus interface and circuitry needed to

perform specific functions related to your application

Publication 1794ĆUM009D-EN-P - April 2004

1–2 Overview of FLEX I/O and your Remote I/O Adapter Module

How FLEX I/O Modules Communicate with Programmable Controllers

The adapter transfers your configuration data



PWR

ADAPTER

ACTIVE FAULT

LOCAL FAULT

POWER SUPPLY

RIO ADAPTER

1794ĆASB

24VDC

Your ladder program instructs the

adapter to perform a BTR of the values

and stores them in a data table.

Data transfer to and from the remote I/O adapter/power supply and discrete I/O modules occurs every flexbus scan. This provides the controller with updated data.

The remote I/O adapter/power supply transfers data to the analog I/O module (block transfer write) and from the analog I/O module (block transfer read) using BTW and BTR instructions in your ladder diagram program. These instructions let the adapter obtain input values and status from the I/O module, and let you send output values to establish the module’s mode of operation. The communication process is described in the following illustration.

to the module using a BTW.

Flexbus



INPUT 0 INPUT 2 INPUT 4 INPUT 6INPUT 1 INPUT 3 INPUT 5 INPUT 7 IVIVIVIVIVIVIVI

ANALOG INPUT

External devices transmit

analog signals to the module.

1794-IE8

The adapter and module determine

that the transfer was made without error

and input values are within specified

range.

Your ladder program can use and/or move the data (if valid)

before it is written over by the transfer of new data in a

subsequent transfer.

Your ladder program performs BTWs to the module when you power

it up, and any time you wish to reconfigure the module.

The module converts analog signals

into binary format and stores these

values until the adapter requests their

transfer.

Publication 1794ĆUM009D-EN-P - April 2004

1–3Overview of FLEX I/O and your Remote I/O Adapter Module

Hardware Components

Diagnostic Indicators

Reset Pushbutton

Address/Group Switches

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

AllenĆBradley

ADAPTER

ACTIVE FAULT

PWR

LOCAL FAULT

24 VDC

POWER SUPPLY

RIO ADAPTER

1794-ASB

24V dc Common Wiring Connections

+24V dc Wiring Connections

Remote I/O Wiring Connections (connector part no. 942029-03)

Diagnostic Indicators

Diagnostic indicators are located on the front panel of the adapter module. They show both normal operation and error conditions in your remote I/O system. The indicators are:

• Power ON (green)

• Adapter ACTIVE (green)

• Adapter FAULT (red)

• LOCAL FAULT (red)

A complete description of the diagnostic indicators and how to use them for troubleshooting is explained in chapter 4.

Publication 1794ĆUM009D-EN-P - April 2004

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.

Important: Do not cycle power to the adapter to clear a fault. All

queued block transfer instructions will be lost.

Remote I/O Wiring

The remote I/O wiring termination is made to a plug-in connector on the front of the adapter module. Refer to Chapter 2 for information on wiring the connector.

FlipĆopen

cover

Power Wiring

Connections are provided for connecting the required 24V dc power to the front of the module. The power wiring can be daisy-chained to the terminal base unit located next to the adapter to supply power to the module installed in that base unit. Wiring information is shown in Chapter 2.

Address Switch Assemblies

Multi-position switches are provided for:

• starting I/O group

• I/O rack number

• hold inputs

• mode switches for mode 0, mode 1, mode 2, mode 3 and mode 4

• rack fault

87654321

• communication rate

• processor restart lockout (PRL)

• hold last state (outputs)

These switches are accessed by lifting the hinged cover on the front

of the module. Refer to Chapter 2 for switch settings.

Chapter Summary

Publication 1794ĆUM009D-EN-P - April 2004

In this chapter you learned about the FLEX I/O system and features of the remote I/O adapter module.

 

Installing Your Remote I/O Adapter Module

Chapter Objectives

This chapter describes the procedures for installing your remote I/O adapter module. These include:

• power requirements

• mounting the remote I/O adapter

• setting the module switches

ATTENTION

Environment and Enclosure

Publication 1794ĆUM009D-EN-P - April 2004

2–2 Installing Your Remote I/O Adapter Module

ATTENTION

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential

static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component

boards.

• Do not touch circuit components inside the

equipment.

• If available, use a static–safe workstation.

• When not in use, keep modules in appropriate

static–safe packaging.

ATTENTION

• sending an erroneous signal to your system’s

field devices causing unintended machine motion

• causing an explosion in a hazardous environ-

ment

Repeated electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance.

Publication 1794ĆUM009D-EN-P - April 2004

2–3Installing Your Remote I/O Adapter Module

Power Requirements

Mounting the Remote I/O Adapter

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 of 8 modules. Remember to add this amount to current requirements for other modules using the same 24V supply.

The remote I/O adapter module can be DIN rail or wall/panel mounted. Refer to the specific method of mounting below.

Mounting on a DIN Rail before installing the terminal base units



1. Position the remote I/O adapter module A on a 35 x 7.5mm DIN rail B (A-B pt. no. 199-DR1; 46277-3; EN 50022) at a slight angle.

2. Rotate the adapter module onto the DIN rail with the top of the rail hooked under the lip on the rear of the adapter module.

3. Press the adapter module down onto the DIN rail until flush. Locking tab (C) will snap into position and lock the adapter module to the DIN rail.

If the adapter module does not lock in place, use a screwdriver or similar device to move the locking tab down while pressing the adapter module flush onto the DIN rail and release the locking tab to lock the adapter module in place. If necessary, push up on the locking tab to lock.

4. Connect the adapter wiring as shown under “Wiring” later in this document.

Make certain that the DIN rail is properly

IMPORTANT

grounded to the panel. Refer to “Industrial Automation Wiring and Grounding Guidelines,” publication 1770-4.1.

Publication 1794ĆUM009D-EN-P - April 2004

2–4 Installing Your Remote I/O Adapter Module

Mounting (or Replacing) the Adapter on an Existing System

ATTENTION

1. Remove the RIO plug-in connector from the front of the adapter.

2. Disconnect any wiring connected to the adjacent terminal base.

3. Using a screwdriver or similar tool, open the lock and remove the

module from the base unit to which the adapter will be attached.

4. Push the flexbus connector toward the right side of the terminal

base to unplug the backplane connection.

ATTENTION

If you connect or disconnect wiring while the field side power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

Make certain that the flexbus connector is completely clear of the adapter. The slide must be completely to the right and the raised spot on the slide visible.

5. Release the locking tab and remove the adapter.

6. Before installing the new adapter, notice the notch on the right

rear of the adapter. This notch accepts the hook on the terminal base unit. The notch is open at the bottom. The hook and adjacent connection point keep the terminal base and adapter tight together, reducing the possibility of a break in communication over the backplane.

ATTENTION

7. Place the adapter next to the terminal base unit and push down to

mate the hook into slot.

Make certain that the hook on the terminal base is properly hooked into the adapter. Failure to lock the hook into the adjacent base/adapter can result in loss of communication on the backplane.

Publication 1794ĆUM009D-EN-P - April 2004

2–5Installing Your Remote I/O Adapter Module

8. With the hook on the terminal base inside the notch on the

adapter, and the lip on the rear of the adapter hooked over the DIN rail, press in and down to lock the adapter onto the DIN rail.

If the adapter module does not lock in place, use a screwdriver or similar device to move the locking tab down while pressing the adapter module flush onto the DIN rail and release the locking tab (C) to lock the adapter module in place. If necessary, push up on the locking tab to lock.

9. Gently push the flexbus connector into the side of the adapter to complete the backplane connection.

10.Reinstall the module into the terminal base unit.



11. Reconnect the adapter wiring as shown under “Wiring.”

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. Lay out the required points on the wall/panel as shown in the drilling dimension drawing.

2. Drill the necessary holes for #6 self-tapping mounting screws.

3. Mount the mounting plate (1) for the adapter module using two

#6 self-tapping screws (18 included).

Make certain that the mounting plate is properly

IMPORTAN

grounded to the panel. Refer to “Industrial Automation Wiring and Grounding Guidelines for Noise Immunity,” publication 1770-4.1.

4. Hold the adapter (2) a slight angle and engage the top of the mounting plate in the indention on the rear of the adapter module.

5. Press the module down flush with the panel until the locking lever locks.

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2–6 Installing Your Remote I/O Adapter Module

Inches

(Millimeters)

3.2

(80)

3.4

(87)

.83 (21)

1.4

(35)

2.7

(68)

1794 Adapters

3.4H x 2.7W x 2.7D (87H x 68W x 69D)

2.3

(59)

1794 Terminal Base Units

3.7H x 3.7W x 2.7D (94H x 94W x 69D)

(35)

3.7

(94)

1.4

3.7

(94)

= Mounting hole dimensions for optional

0.9

(23)

mounting kit

6. Position the termination base unit up against the adapter and push

the female bus connector into the adapter.

7. Secure to the wall with two #6 self-tapping screws.

2.0

(50)

1.2

(30)

3.7

(94)

3.2

(80)

2 - Remote I/O Adapter Module

8. Repeat for each remaining terminal base unit.

Note: The adapter is capable of addressing eight modules. Do not

exceed a maximum of eight terminal base units in your system.

1.4

(35.5)

1 - Adapter Mounting Plate

Mounting Screws(18) -

2 for the mounting plate

and 2 each for the 8

possible modules

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2–7Installing Your Remote I/O Adapter Module

Wiring

Connect external wiring to the remote I/O adapter as shown below.

AllenĆBradley

ADAPTER

LOCAL

ACTIVE FAULT

PWR

Termination resistor (if required)

82Ω or 150Ω (refer to your processor

documentation for size and usage)

FAULT

24 VDC

POWER SUPPLY

RIO ADAPTER

1794-ASB

COM

24V

20131

1. Connect the remote I/O cable to the removable plug-in remote

I/O connector.

Connect To

Blue Wire - RIO 1

Shield Wire - RIO SH

Clear Wire - RIO 2

For Example:

DaisyĆchaining

24V dc

ATTENTION

If this is the last adapter in your FLEX I/O system, or the last adapter on the remote I/O link, you must use a termination resistor across

terminals 1 and 2 on the remote I/O connector. Refer to the information supplied with the processor being used for information on the size of the resistor.

2. Connect +24V dc input to the left side of the lower connector terminal A.

3. Connect 24V common to the left side of the upper connector terminal B.

4. Connections C and D are used to pass 24V dc power and common to the next module in the series (if required).

Wiring when total current draw is less than 10A

Note: Modules must be either all analog or all discrete. Do not mix analog

and discrete modules when using the daisyĆchain wiring scheme.

Note: Refer to the individual instructions for each module for actual wiring information.

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2–8 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 logical rack number

• hold inputs

• addressing modes

• last chassis

• communication rate

• processor restart lockout (PRL)

• hold last state (outputs)

WARNING

The switch settings on the series E adapter are not the same as on the series A, B, C or D adapter. If you are replacing an earlier series adapter with this series E adapter, make certain that the switches are set correctly for your application.

Starting I/O Group

Chapter

An I/O group is an addressing unit that can contain up to 16 input terminals and 16 output terminals. The starting I/O group is the first group of input and output circuits that correspond to one word in both the input and output image tables. These starting I/O groups are numbered 0, 2, 4 and 6. The number of modules that make up an I/O group varies with the mode of addressing.

I/O Rack Number

One logical I/O rack is 8 I/O groups. You cannot have more than 2 logical racks per adapter. Refer to “Determining Rack Size” on page 3–16 for examples.

Hold Inputs

When hold inputs is enabled (S2-7 on), the adapter will retain the last memory image present when you remove a discrete input module from its base. These inputs are held until the correct module is placed back in the base. If the same type of module is reinserted into the base, its inputs will be transferred. If a different type of module is inserted in the base, its memory image will go to zero. Any associated outputs will also go to zero.

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2–9Installing Your Remote I/O Adapter Module

Rack Fault Select Switch (RFS)

The rack fault select allows the user to determine what action the adapter takes if communication is lost with one or more I/O modules

ATTENTION

When RFS is disabled (S2–6 on), module removal and insertion

under power (RIUP) is possible. If an I/O module stops responding, the adapter declares a local fault and flashes the Local Fault indicator. The adapter also resets the output data (if any) for the module not responding. All other modules remain active.

When the RFS is enabled (S2-6 off), communication error detection is extended to the I/O module level. If an I/O module stops responding, the adapter declares a local fault, flashes the Local Fault indicator and causes the scanner to declare a Rack Fault. The adapter resets the output data (if any) for the module not responding and commands all other outputs to go to the state determined by the Hold Last State switch (S2–1).

ATTENTION

If an I/O module stops responding to the adapter due to a module being removed under power, a problem with the flexbus, or a problem with an I/O module, the adapter declares a Local fault.

Module removal and insertion under power (RIUP) will cause a rack fault when Rack Fault Select is enabled.

Addressing Mode Selection Switches

The addressing mode switches are used to select the addressing modes of the adapter: standard, 8-pt compact, 16-pt compact, 8-pt complementary, 16-pt complementary, 32 standard, and 32 complimentary. Refer to the table on page2–12 for information on the interaction of these switches.

Mode switch S1-1 provides different functions. In standard mode, it acts as part of the rack address, providing backward compatibility with the series A or B adapters. In compact mode, it determines 8 or 16-point density. In complementary mode, it specifies whether the rack has a complementary rack at the same address.

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2–10 Installing Your Remote I/O Adapter Module

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 Autobaud (used in 32-pt modes)

Processor Restart Lockout (PRL)

When PRL is disabled (switch S2-2 on), the programmable controller can restart communication with the adapter in the event of a communication fault.

Reset

Pushbutton

When PRL is enabled (switch S2-2 off), the programmable controller cannot restart communication with the adapter in the event of a communication fault. In this case, you must press the restart pushbutton on the front of the adapter module to restart communication.

Hold Last State (HLS)

The hold last state option allows the user to determine what action the outputs take in the event of a communication error.

When HLS is enabled (S2–1 off), all digital outputs, and 1794-OE4 and 1794-IE4XOE2 analog modules remain in their last state. All other analog outputs take their configured safe state action

When HLS is disabled (S2–1 on), all digital outputs are reset. All analog outputs take their configured safe state action

ATTENTION

Only 1794-OE4 and 1794-IE4XOE2 analog modules hold their last state when Hold Last State is enabled. Refer to the respective module publications for information about configuring analog output safe state actions.

Publication 1794ĆUM009D-EN-P - April 2004

The switch assemblies are located under a flip-open cover on the front of the adapter module.

2–11Installing Your Remote I/O Adapter Module

Starting I/O Group

S1-8 S1-7 I/O group

ON ON 0 (1st quarter)

OFF ON 2 (2nd quarter)

ON OFF 4 (3rd quarter)

OFF OFF 6 (4th quarter)

1 In 32 point mode, starting quarter must be 0 (S1-8 and S1-7 on).

I/O Rack Number

S1-6 thru S1-1

Refer to page 2-13

S2-8 Mode Switch 0

Refer to Mode Selection Switches, 2-12

S2-7 Hold Inputs

ON Hold Inputs

OFF Reset Inputs

S2-6 Rack Fault

ON Not Enabled (default)

OFF Enabled

Starting

I/O Group

I/O Rack

Number

Mode Switch 2

FlipĆopen

cover

87654321

S2-5 Mode Switch 1

Refer to Mode Selection Switches, 2-12

Communication Rate/

32-pt Mode Select

S2-4 S2-3 Bits/s

ON ON 57.6k

OFF ON 115.2k

ON OFF 230.4k

OFF OFF Autobaud (use only with 32Ćpt

Cycle power to the 1794ĆASB/E or push the reset

button when baud rate is changed in the scanner.

mode

) Use these switches to put the adapter in 32-pt mode and perform autobaud.

Processor Restart Lockout (PRL)

S2-2 Processor:

ON Restart

OFF Locked out

Hold Last State (HLS)

S2-1 Processor will:

ON Reset outputs

OFF Hold last state

87654321

Mode Switch 0

Hold Inputs Rack Fault

Mode Switch 1

Mode Switch 4

Communication Rate/Mode switches 3 and 4

Mode Switch 3

Processor Restart Lockout Hold Last State

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2–12 Installing Your Remote I/O Adapter Module

8Ćpoint modules

16Ćpoint modules

Setting the Mode Selection Switches

When Using this Addressing Mode

Standard

Compact

Complementary See Complementary Rack Addressing Table, page2-15

Primary chassis

Complementary chassis

Complementary See Complementary Rack Addressing Table, page 2-15

Primary chassis

Complementary chassis

In standard mode, this switch retains its function as switch position 1 of rack addressing. In Standard mode, the module is functionally interchangeable with a 1794ĆASB series A or B adapter.

In compact mode, 32-point modules appear as 8 or 16-point modules.

When programming block transfers, address analog modules as module 0 if switch S1Ć1 is on; module 1 if switch S1Ć1 is off.

Set the mode selection switches for the desired mode as follows.

1. Lift the hinged switch cover on the front of the adapter to expose

the switches.

2. Set the switches as shown below.

3. Cycle power to the adapter to activate the settings.

And

8 and/or 16Ć point modules

Mode Switch 2

S1Ć1

See note 1 ON ON

8Ćpoint modules OFF ON OFF

16Ćpoint modules ON ON OFF

OFF OFF ON

ON OFF ON

OFF OFF OFF

ON OFF OFF

Mode Switch 1

S2Ć5

Mode Switch 0

S2Ć8

When Using this Addressing Mode

Standard - 32

And

8, 16 and/or 32Ć point modules

Complementary - 32 Primary chassis

Complementary - 32 Complementary chassis

In Standard - 32 mode, any module in the chassis occupies 32 input points and 32 output points in the Input/Output data table.

In Complementary - 32 mode, any module in the chassis occupies 32 input points or 32 output points in the Input/Output data table. If using an 8 point or 16 point module, the unused

points in the data table are zeroed out.

8, 16 and/or 32Ć point modules

Mode Switch 0

S2-8

Mode Switch 1

S2Ć5

Mode Switch 2

S1-1

Mode Switch 3

S2-3

ON ON See note 1 OFF OFF

OFF OFF OFF OFF OFF

OFF OFF ON OFF OFF

Mode Switch 4

S2Ć4

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2–13Installing Your Remote I/O Adapter Module

only available in standard and standard 32

Setting the Address Switches

Use the following table to set your address switches. (Refer to page 2–15 to set address switches when in complementary mode.)

Rack Number S1 Switch Position

1747ĆSN PLCĆ5 PLCĆ5/250 PLCĆ3 6 5 4 3 2 1

Rack 0 Not Valid Rack 0 Rack 0 ON ON ON ON ON ON

Rack 1 Rack 1 Rack 1 Rack 1 OFF ON ON ON ON ON

Rack 2 Rack 2 Rack 2 Rack 2 ON OFF ON ON ON ON

Rack 3 Rack 3 Rack 3 Rack 3 OFF OFF ON ON ON ON

Rack 4 Rack 4 Rack 4 ON ON OFF ON ON ON

Rack 5 Rack 5 Rack 5 OFF ON OFF ON ON ON

Rack 6 Rack 6 Rack 6 ON OFF OFF ON ON ON

Rack 7 Rack 7 Rack 7 OFF OFF OFF ON ON ON

Rack 10 Rack 10 Rack 10 ON ON ON OFF ON ON

Rack 11 Rack 11 Rack 11 OFF ON ON OFF ON ON

Rack 12 Rack 12 Rack 12 ON OFF ON OFF ON ON

Rack 13 Rack 13 Rack 13 OFF OFF ON OFF ON ON

Rack 14 Rack 14 Rack 14 ON ON OFF OFF ON ON

Rack 15 Rack 15 Rack 15 OFF ON OFF OFF ON ON

Rack 16 Rack 16 Rack 16 ON OFF OFF OFF ON ON

Rack 17 Rack 17 Rack 17 OFF OFF OFF OFF ON ON

Rack 20 Rack 20 Rack 20 ON ON ON ON OFF ON

Rack 21 Rack 21 Rack 21 OFF ON ON ON OFF ON

Rack 22 Rack 22 Rack 22 ON OFF ON ON OFF ON

Rack 23 Rack 23 Rack 23 OFF OFF ON ON OFF ON

Rack 24 Rack 24 Rack 24 ON ON OFF ON OFF ON

Rack 25 Rack 25 Rack 25 OFF ON OFF ON OFF ON

Rack 26 Rack 26 Rack 26 ON OFF OFF ON OFF ON

Rack 27 Rack 27 Rack 27 OFF OFF OFF ON OFF ON

Rack 30 Rack 30 ON ON ON OFF OFF ON

Rack 31 Rack 31 OFF ON ON OFF OFF ON

Rack 32 Rack 32 ON OFF ON OFF OFF ON

Rack 33 Rack 33 OFF OFF ON OFF OFF ON

Rack 34 Rack 34 ON ON OFF OFF OFF ON

Rack 35 Rack 35 OFF ON OFF OFF OFF ON

Rack 36 Rack 36 ON OFF OFF OFF OFF ON

Rack 37 Rack 37 OFF OFF OFF OFF OFF ON

See note 1 - Rack addresses 40 thru 76 are-Rack 40 ON ON ON ON ON OFF

modes.

Continued on next page

Rack 41

OFF ON ON ON ON OFF

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2–14 Installing Your Remote I/O Adapter Module

Rack address 77 is an illegal configuration. PLCĆ5/11 processors can scan rack 03. PLCĆ5/15 and PLCĆ5/20 processors can scan racks 01-03. PLCĆ5/25 and PLCĆ5/30 processors can scan racks 01-07. PLCĆ5/40 and PLCĆ5/40L processors can scan racks 01-17. PLCĆ5/60 and PLCĆ5/60L processors can scan racks 01-27. PLCĆ5/250 processors can scan racks 00-37. PLCĆ3 processors can scan racks 00-76. Note1-Whenusing a 1794ĆASB series C (or later) adapter module, rack addresses 40 to 76 are only available in Standard and Standard-32 modes.

S1 Switch PositionRack Number

123456PLCĆ3PLCĆ5/250PLCĆ51747ĆSN

Rack 42 ON OFF ON ON ON OFF

Rack 43 OFF OFF ON ON ON OFF

Rack 44 ON ON OFF ON ON OFF

Rack 45 OFF ON OFF ON ON OFF

Rack 46 ON OFF OFF ON ON OFF

Rack 47 OFF OFF OFF ON ON OFF

Rack 50 ON ON ON OFF ON OFF

Rack 51 OFF ON ON OFF ON OFF

Rack 52 ON OFF ON OFF ON OFF

Rack 53 OFF OFF ON OFF ON OFF

Rack 54 ON ON OFF OFF ON OFF

Rack 55 OFF ON OFF OFF ON OFF

Rack 56 ON OFF OFF OFF ON OFF

Rack 57 OFF OFF OFF OFF ON OFF

Rack 60 ON ON ON ON OFF OFF

Rack 61 OFF ON ON ON OFF OFF

Rack 62 ON OFF ON ON OFF OFF

Rack 63 OFF OFF ON ON OFF OFF

Rack 64 ON ON OFF ON OFF OFF

Rack 65 OFF ON OFF ON OFF OFF

Rack 66 ON OFF OFF ON OFF OFF

Rack 67 OFF OFF OFF ON OFF OFF

Rack 70 ON ON ON OFF OFF OFF

Rack 71 OFF ON ON OFF OFF OFF

Rack 72 ON OFF ON OFF OFF OFF

Rack 73 OFF OFF ON OFF OFF OFF

Rack 74 ON ON OFF OFF OFF OFF

Rack 75 OFF ON OFF OFF OFF OFF

Rack 76 ON OFF OFF OFF OFF OFF

Not Valid OFF OFF OFF OFF OFF OFF

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2–15Installing Your Remote I/O Adapter Module

Setting the Address Switches for Complementary I/O

Use the following table to set your address switches for complementary I/O when using a PLC-5 processor. For all other processors, refer to the programming manual for that specific processor.

Primary Rack

Rack Number S1 Switch Position

1747ĆSN PLCĆ5 6 5 4 3 2 1

Rack 0 Not Valid ON ON ON ON ON OFF

Rack 1 Rack 1 OFF ON ON ON ON OFF

Rack 2 Rack 2 ON OFF ON ON ON OFF

Rack 3 Rack 3 OFF OFF ON ON ON OFF

Rack 4 ON ON OFF ON ON OFF

Rack 5 OFF ON OFF ON ON OFF

Rack 6 ON OFF OFF ON ON OFF

Rack 7 OFF OFF OFF ON ON OFF

Complementary Rack

Rack Number S1 Switch Position

1747ĆSN PLCĆ5 6 5 4 3 2 1

Rack 0 Not Valid ON ON ON OFF ON ON

Rack 1 Rack 1 OFF ON ON OFF ON ON

Rack 2 Rack 2 ON OFF ON OFF ON ON

Rack 3 Rack 3 OFF OFF ON OFF ON ON

Rack 4 ON ON OFF OFF ON ON

Rack 5 OFF ON OFF OFF ON ON

Rack 6 ON OFF OFF OFF ON ON

Rack 7 OFF OFF OFF OFF ON ON

Chapter Summary

In this chapter you learned how to install your adapter module and set your switches. Chapter 3 tells you how to communicate with your system.

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2–16 Installing Your Remote I/O Adapter Module

Publication 1794ĆUM009D-EN-P - April 2004

Communicating with FLEX I/O Modules

 

Chapter Objectives

FLEX I/O Module Data

In this chapter, we tell you about:

• FLEX I/O module data

• selecting an addressing type

• selecting an addressing mode

• determining rack size

• mapping data into the image tables

• operating modes

There are 2 types of data associated with FLEX I/O modules: input data and output data.

• input data – data read from the module by the processor

• output data – data written to the module by the processor

Some digital I/O modules have both input and output data associated with them. Digital I/O modules map input data and output data to the input and output image tables in the processor. Input and output data can be defined as:

• real I/O data – data that represents the actual state of

hardwired inputs and outputs (input data on input modules, output data on output modules)

• configuration/status data – data written to configure the

module (such as delay times); and status information (such as a fuse blown indication)

For FLEX analog modules, input and output data is only accessible by the processor using block transfer instructions. The data is contained in block transfer write (BTW) and block transfer read (BTR) data files, not in the input and output image tables. A byte of input image and a byte of output image is required for the module status byte (MSB) and the module control byte (MCB). The MSB uses input image, and the MCB uses output image. These bytes are required for block transfer command communications.

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3–2 Communicating with FLEX I/O Modules

Addressing I/O

The 1794-ASB series E adapter supports 5 different modes of addressing: standard, compact, complementary, standard–32 and complementary–32.

For digital modules, the mode of addressing determines what type of data is available to the processor from the module.

• standard addressing – input and output data is available for each

digital module connected to the adapter

• compact addressing – either input or output data (not both) is

available for each digital module connected to the adapter

• complementary addressing – either input or output data (not both)

is available for each digital module connected to the adapter

Analog modules can be used in any mode of addressing with no loss of data because data is not stored in the input and output image table, with the exception of the MCB and MSB. Analog data is stored in BTW and BTR data files.

The following table helps you to select an addressing mode based on the kind of modules you want to use, and the features you need from those modules. The table also lists both advantages and disadvantages of using each addressing type.

Addressing Mode Use this addressing scheme when: Advantages Disadvantages

Standard •you need full FLEX I/O module

functionality, including combination modules (1794ĆIB10XOB6), settable input delay times on input modules (1794ĆIB16, ĆIB8S), and fuse blown indication (1794ĆOB8EP) for example. Will work with 32-pt. modules with 16 in and 16 out (1794-IB16XOB16P).

Compact •you don't need full FLEX I/O module

functionality, including combination modules (1794ĆIB10XOB6), settable input delay times on input modules (1794ĆIB16, ĆIB8S), and fuse blown indication (1794ĆOB8EP), for example.

•you can locate equal numbers of

input and output modules in a single chassis

•User has access to 1 word of input, 1

word of output for each digital module.

•Eight modules equal 1 logical rack.

•No restrictions on module placement

•Maximum use of configuration/status and

combination modules

•Eight 8 point modules equal 1/4 logical

racks (when input and output modules are installed in alternate slots).

•Eight 16 point modules equal 1/2 logical

racks (when input and output modules are installed in alternate slots).

•Provides maximum use of I/O image table

by a single FLEX chassis (when input and output modules are installed in alternate slots).

•Inefficient I/O image table

utilization

•You must configure all modules

in the chassis as either 8Ćpoint orĆ16 point.

•No combination modules

allowed

•Configuration/status data is not

accessible to user

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3–3Communicating with FLEX I/O Modules

Complementary •you  need full FLEX I/O module

functionality, including combination modules (1794ĆIB10XOB6), settable input delay times on input modules (1794ĆIB16, ĆIB8S), and fuse blown indication (1794ĆOB8EP), for example.

•you can locate equal numbers of

input and output modules in separate chassis

Standard - 32 •you need full FLEX I/O module

functionality, including 32 point modules, combination modules (1794ĆIB10XOB6), settable input delay times on input modules (1794ĆIB16, ĆIB8S), and fuse blown indication (1794ĆOB8EP) for example.

Complementary - 32 •you  need full FLEX I/O module

functionality, including combination modules (1794ĆIB10XOB6), settable input delay times on input modules (1794ĆIB16, ĆIB8S), and fuse blown indication (1794ĆOB8EP), for example.

•you can locate equal numbers of

input and output modules in separate chassis

•Eight 8 point modules in each chassis

equal 1/2 logical rack (when input modules are installed in 1 chassis, and output modules are installed in the complementary chassis).

•Eight 16 point modules in each chassis

equal 1 logical rack (when input modules are installed in 1 chassis, and output modules are installed in the complementary chassis).

•Provides maximum use of I/O image table

in 2 FLEX chassis (when input modules are installed in 1 chassis, and output modules are installed in the complementary chassis).

•User has access to 2 words of input, 2

words of output for each digital module.

•Four modules equal 1 logical rack.

•No restrictions on module placement

•Maximum use of configuration/status and

combination modules

•Eight modules in each chassis equal 2

logical racks

•Provides maximum use of I/O image table

in 2 FLEX chassis (when input modules are installed in 1 chassis, and output modules are installed in the complementary chassis).

•You must configure all modules

in both chassis as either 8Ćpoint or 16Ćpoint.

•No combination modules

allowed

•Configuration/status data is not

accessible to user

•Inefficient I/O image table

utilization

•All digital I/O modules are

configured as 32Ćpoint.

•No combination modules

allowed

•Configuration/status data may

not be accessible to user (depending on module type).

The amount of data accessible to the processor in the 5 addressing modes is illustrated below. Note that the shaded areas represent data not accessible by the processor.

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3–4 Communicating with FLEX I/O Modules

Digital I/O Modules

Input Module Example Output Module Example

Input Word

Output Word

8 Bits 8 Bits

8 Bits8 Bits

Note: If 32 pt. modules are used in standard mode, only the lower word (16 bits) will be sent to the processor. All 32 bits of the 32-pt combo module are available.

8 Bits 8 Bits

8 Bits8 Bits

Standard Mode

16 bits of input AND

16 bits of output available

Input Word 0

Input Word 1

Output Word 0

Output Word 1

Input Word

Output Word

Input Word

Output Word

Input Module Example

8 Bits 8 Bits

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

Input Module Example Output Module Example

8 Bits 8 Bits

8 Bits8 Bits

Note: If 32 pt. modules are used in 16 pt. compact mode, only the low word (16 bits) will be sent to the processor.

Input Module Example Output Module Example

8 Bits 8 Bits

8 Bits8 Bits

Note: If 16Ćpt or 32Ćpt modules are used in 8Ćpt compact addressing, only the information in the lowest byte (8 bits) will be sent to the processor.

Output Module Example

8 Bits 8 Bits

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

Standard - 32 Mode

32 bits of input AND

32 bits of output available

Compact Mode

16Ćpt Density

16 bits of input OR

16 bits of output available

Compact Mode

8Ćpt Density

8 bits of input OR

8 bits of output available

16Ćbit Input modules complemented by 16Ćbit output modules

Input Module Example Output Module Example

Input Word

Output Word

Input Word

Output Word

Publication 1794ĆUM009D-EN-P - April 2004

8 Bits 8 Bits

Input Module Example Output Module Example

8 Bits 8 Bits

Primary Chassis

8 Bits 8 Bits

8 Bits8 Bits

Complement Chassis

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

Note: If 32Ćpt modules are used in 16Ćpt complimentary addressing,

only the information in the lower word will be sent to the processor.

8 Bits8 Bits

Complementary Mode

16Ćpt Density

16 bits of input OR

16 bits of output available

Input Word

Output Word

Input Word

Output Word

Input Word 0

Input Word 1

Output Word 0

Output Word 1

8Ćbit Input modules complemented by 8Ćbit output modules

Primary Chassis

Input Module Example Output Module Example

8 Bits 8 Bits

8 Bits8 Bits

Complement Chassis

Input Module Example Output Module Example

8 Bits 8 Bits

8 Bits8 Bits

Note: If 16Ćpt or 32Ćpt modules are used in 8Ćpt complementary addressing,

only the information in the lowest byte will be sent to the processor.

8 Bits 8 Bits

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

32Ćbit Input modules complemented by 32Ćbit output modules

Primary Chassis

Input Module Example Output Module Example

8 Bits 8 Bits

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

3–5Communicating with FLEX I/O Modules

Complementary Mode

8Ćpt Density

8 bits of input OR

8 bits of output available

Complementary - 32 Mode

32-pt density

32 bits of input OR

32 bits of output available

Input Module Example Output Module Example

Input Word 0

Input Word 1

Output Word 0

Output Word 1

8 Bits 8 Bits

Note: Shaded areas represent data not accessible by the processor.

Analog (Block Transfer) Modules

Complement Chassis

8 Bits 8 Bits

8 Bits8 Bits

8 Bits 8 Bits

8 Bits8 Bits

Complementary - 32 Mode

32 bits of input OR

32 bits of output available

Analog modules use block transfers, which require 1 byte (8 bits) of input image for the module status byte, and 1 byte (8 bits) of output image for the module control byte. This is true for any addressing mode selected.

Input Word

Output Word

Input or Output Example

8 Bits 8 Bits

MSB

MCB

Any Mode

Block transfers require

8 bits of input image and

8 bits of output image

Publication 1794ĆUM009D-EN-P - April 2004

3–6 Communicating with FLEX I/O Modules

Standard Addressing

Input Output Input Output Analog Analog Output Input

Adapter

Use standard addressing when:

• you need full FLEX I/O module functionality, such as delay time

selection on input modules, fuse-blown indication on the 1794-OB8EP, etc.

• using combination modules, such as the 1794-IB10XOB6 10 in/6

out module

In standard mode, each module position equals one I/O group – 1 word of input image and 1 word of output image. If 32-pt input or output modules are used, only the lower 16 bits are available. All 32 bits of the 32–pt combination modules are available.

Any combination of digital or analog modules.

Eight terminal bases per adapter (maximum)

Each terminal base represents 1 I/O group

20128

Standard Addressing Example

I/O Group 0 I/O Group 1 I/O Group 2 I/O Group 3

M0 M1 M2 M3 M4 M5 M6 M7

ASB/E

IL = Input Low Byte IH = Input High Byte OL = Output Low Byte

OH = Output High Byte

IH IL IH IL

OH OL OH OL OH OL

IB16 IB16IB16

I/O Group

IH IL IH IL IH IL

OH OL

MCB = Module Control Byte (output data) MSB = Module Status Byte (input data)

0 1

2 3 4 5 6 7

- 8 modules = 1 logical rack = 8 I/O groups

I/O Group 4 I/O Group 5 I/O Group 6 I/O Group 7

MSB

OH OL

OB16

Legal Module Placement in Standard Addressing

Any module in any slot

1 module position is an I/O group

Input Image Table Output Image Table

00071017 00071017

M0ĆIH M1ĆIH

M0ĆIL M1ĆIL

M2ĆILM2ĆIH M2ĆOLM2ĆOH M3ĆILM3ĆIH

M4ĆMSB M5ĆMSB

M6ĆILM6ĆIH M7ĆILM7ĆIH

MCB

IE8 IE8

MSB MCB

M0ĆOH M1ĆOH

M4ĆMCB

M5ĆMCB M6ĆOH M7ĆOH

IH IL

OH OL

OB16OB16

M0ĆOL M1ĆOL

M3ĆOLM3ĆOH

M6ĆOL M7ĆOL

Publication 1794ĆUM009D-EN-P - April 2004

3–7Communicating with FLEX I/O Modules

Standard - 32 Addressing

Use standard 32 point addressing when:

• you use 32 point modules in your system

• you need full FLEX I/O module functionality, such as delay time

selection on input modules, fuse-blown indication on the 1794-OB8EP, etc.

• using combination modules, such as the 1794-IB16XOB16 16

in/16 out module

In standard – 32 mode, each module position equals two I/O groups – 2 words of input image and 2 words of output image.

Standard 32 Addressing Example - 8 modules = 2 logical racks, N and N+1 = 16 I/O groups

Rack N RackN+1

M0 M1 M2 M3 M4 M5 M6 M7

Gr. 0

Gr. 1 Gr. 2 Gr. 3 Gr. 4 Gr. 5 Gr. 6 Gr. 7

IHH IHL

ILH ILL IH IL

ASB/E

OLH

OLL

OHH OHL

ILH ILL

IHH IHL

OH OL OLL

OHH OHLOLH OLL

ILH ILL

OHH OHLOLH OLL

IB32 OB32IB16 IB32 Analog Analog IB8OB32

Note: Shaded areas represent data which is not available.

Eight terminal bases per adapter (maximum) Each terminal base represents 2 I/O groups.

ILL, OLL = Bits 0 thru 7 for input and output words of 32 point modules ILH, OLH = Bits 8 thru 15 for input and output words of 32 point modules IHL, OHL = Bits 16 thru 23 for input and output words of 32 point modules IHH, OHH = Bits 24 thru 32 for input and output words of 32 point modules IL, OL = Bits 0 thru 7 for input and output words for 16 and 8 point modules

IH, OH = Bits 8 thru 15 for input and output words for 16 point modules

MCB = Module Control Byte (output data) MSB = Module Status Byte (input data)

Input Image Table for Rack N Output Image Table for Rack N

I/O Group

0 1

1 2

2 3

3 4

4 5

5 6

6 7

M0ĆILH

M0ĆIHH

M1ĆILH M1ĆOLLM1ĆOLLM1ĆOLHM1ĆOLH

M1ĆILH

M1ĆIHH

M1ĆIHHM1ĆIHH

M2ĆIH

M2ĆILHM2ĆILH

M2ĆIHHM2ĆIHH M3ĆILH

M3ĆILHM3ĆILH

M3ĆIHH

M0ĆILLM0ĆILL

M0ĆILL

M0ĆIHLM0ĆIHL M1ĆILLM1ĆILL

M1ĆILL

M1ĆIHL

M1ĆIHLM1ĆIHL

M2ĆILLM2ĆILL

M2ĆIHLM2ĆIHL

M3ĆILL

M3ĆILLM3ĆILL M3ĆIHL

M3ĆIHLM3ĆIHL

00071017 00071017

M2ĆIL

Gr. 0 Gr. 1 Gr. 2 Gr. 3 Gr. 4 Gr. 5 Gr. 6 Gr. 7

IHH IHL ILH

MSB

MCB

Legal Module Placement in Standard Addressing

Any module in any slot

1 module position is 2 I/O groups

I/O GroupI/O Group

00 11

11 22

22 33

33 44

44 55

55 66

66 77

MSB

MCB

M0ĆOLH

M0ĆOLH M0ĆOHH

M0ĆOHH M1ĆOLH

M1ĆOHH M2ĆOLHM2ĆOLH

M2ĆOH

M2ĆOHHM2ĆOHH M3ĆOLH

M3ĆOLH M3ĆOHH

M3ĆOHH

M0ĆOLL

M0ĆOHL

M1ĆOLL

M1ĆOHL

M1ĆOHLM1ĆOHLM1ĆOHHM1ĆOHH

M2ĆOLH

M2ĆOL

M2ĆOHL

M3ĆOLL

M3ĆOHL

OLH

ILL

IHH

IHL

OHH

OHL

I/O Group

0 1

1 2

2 3

3 4

4 5

5 6

6 7

Input Image Table for Rack N+1 Output Image Table for Rack N+1

00071017 00071017

M4ĆMSB

M1ĆILH M1ĆOLLM1ĆOLLM1ĆOLHM1ĆOLH

M1ĆIHHM1ĆIHH

M2ĆILHM2ĆILH

M2ĆIHHM2ĆIHH M7ĆILH

M3ĆILHM3ĆILH

M7ĆIHH

M3ĆIHH

M5ĆMSB

M1ĆILLM1ĆILL

M1ĆIHLM1ĆIHL

M6ĆIL

M2ĆILLM2ĆILL

M2ĆIHLM2ĆIHL

M7ĆILL

M3ĆILLM3ĆILL

M7ĆIHL

M3ĆIHLM3ĆIHL

I/O Group

00 11

11 22

22 33

33 44

44 55

55 66

66 77

M4ĆMCB

M0ĆOLH M0ĆOHH

M0ĆOLL

M0ĆOHL M5ĆMCB

M1ĆOHLM1ĆOHLM1ĆOHHM1ĆOHH M2ĆOLHM2ĆOLH M2ĆOHHM2ĆOHH

M7ĆOLH

M3ĆOLH M3ĆOHH

M7ĆOHH

Publication 1794ĆUM009D-EN-P - April 2004

M6ĆOL

M2ĆOLH M2ĆOHL

M7ĆOLL

M3ĆOLL

M3ĆOHL

M7ĆOHL

3–8 Communicating with FLEX I/O Modules

Compact Addressing

Use compact addressing when:

• you are not using combination modules

• you are using only digital input, digital output and analog

modules

• you don’t need all the features of digital FLEX I/O modules (You

can only access the input word on an input module, or the output word of an output module. Any status information/configuration information in the corresponding input/output word is not accessible.)

• you can locate equal numbers of input and output modules in a

single chassis

• you want more efficient use of the input/output data table

Compact Mode

Compact mode maximizes single chassis I/O image table usage when using either 8- or 16-point modules and block transfer modules.

Compact mode allows more than 1 module to occupy a single I/O group. How many modules depends on the density selected (16- or 8-point).

In compact mode, with 16-point density, 2 digital modules (1 input and 1 output module) can occupy 1 I/O group. In addition, 2 block transfer modules can occupy 1 I/O group. If higher density modules are used, only the lowest 16 bits will be available.

In compact mode, with 8-point density, 4 digital modules (2 input and 2 output modules) mounted in module pairs can occupy 1 I/O group. In addition, 2 block transfer modules can occupy 1 I/O group. If higher density modules are used, only the lowest 8 bits will be available.

Publication 1794ĆUM009D-EN-P - April 2004

3–9Communicating with FLEX I/O Modules

16Ćpoint Compact Addressing

Group 0 Group 1 Group 2 Group 3

Input Output Input Output Output InputAnalog Analog

Adapter

Compact 16Ćpoint Addressing Example

I/O Group 0 I/O Group 1 I/O Group 2 I/O Group 3

M0 M1 M2 M3 M4 M5 M6 M7

ASB/E

IL = Input Low Byte IH = Input High Byte OL = Output Low Byte

OH = Output High Byte

Note: Shaded areas represent unavailable data

IH IL IH IL

OH OL

IB16 IB16IB16

MCB = Module Control Byte (output data) MSB = Module Status Byte (input data)

Input modules and Output modules in pairs, or analog modules.

Eight terminal bases per adapter (maximum)

Each module represents 1/2 of an I/O group

2 modules represent 1 I/O group

8 modules = 1/2 I/O rack

- 8 modules = 1/2 logical rack = 4 I/O groups

OH OL

OB16

MSB MCB

IE8 IE8

Legal Module Placement in 16Ćpt Compact Addressing

A 16Ćpoint input module and a 16Ćpoint output module (or an empty slot) in an I/O group. A 16Ćpt output module and a 16Ćpt input module (or an empty slot) in an I/O group.

A block transfer module with another block transfer module (or an empty slot) in an I/O group.

An empty slot with any module, or another empty slot in an I/O group.

2 module positions = an I/O group

MSB

MCB

20128

IH IL

OH OL

OB16OB16

Input Image Table Output Image Table

I/O Group

0 1

2 3 4 5 6 7

Note: When using block transfer modules in 16Ćpt compact addressing, address module positions M0, M2, M4 and M6 as module 0" in a block transfer instruction block; address module positions M1, M3, M5 and M7 as module 1" in a block transfer instruction block.

M0ĆIH M2ĆIH

M5ĆMSB

M7ĆIH

M4ĆMSB

I/O groups 4-7 are available for another adapter.

00071017 00071017

M0ĆIL M2ĆIL

M7ĆIL

M1ĆOH M3ĆOH

M5ĆMCB

M6ĆOH

M1ĆOL M3ĆOL

M4ĆMCB

M6ĆOL

Publication 1794ĆUM009D-EN-P - April 2004

3–10 Communicating with FLEX I/O Modules

8Ćpoint Compact Addressing - Digital Modules

Input modules and Output modules in the same group.

Group 0 Group 1

Input Output Input Output Output Input

Adapter

Eight terminal bases per adapter (maximum)

Each module represents 1/4 of an I/O group

4 modules represent 1 I/O group

Compact 8Ćpoint Addressing Example - 8 digital modules = 1/4 logical rack

I/O Group 0 I/O Group 1

M0 M1 M2 M3 M4 M5 M6 M7

ASB/E

IL = Input Low Byte IH = Input High Byte OL = Output Low Byte

OH = Output High Byte

Note: Shaded areas represent unavailable data

IL IL

IA8 IA8IA8

OW8

Legal Module Placement in 8Ćpoint Compact Addressing

Two 8Ćpoint input modules and two 8Ćpoint output modules (or empty slots) in an I/O group. Module type must alternate within an I/O group: input, output, etc.

One block transfer module with 3 empty slots One block transfer module, followed by an empty slot, another

block transfer module and another empty slot.

4 module positions to an I/O group

OW8 IA8

InputOutput

20128

OA8OA8

I/O Group

0 1

2 3

4 5 6 7

Input Image Table Output Image Table

00071017 00071017

M2ĆIL M7ĆIL

I/O groups 2-7 are available to additional adapters.

M0ĆIL M5ĆIL

M3ĆOL M6ĆOL

M1ĆOL M4ĆOL

Publication 1794ĆUM009D-EN-P - April 2004

3–11Communicating with FLEX I/O Modules

8Ćpoint Compact Addressing - Analog Modules

Adapter

Analog Empty Analog Empty Analog Empty Analog Empty

Adapter

Group 0 Group 1

Each module and adjacent empty base represents 1/2 of an I/O group

Compact 8Ćpoint Addressing Example

I/O Group 0 I/O Group 1

M0 M1 M2 M3 M4 M5 M6 M7

ASB/C

MCB = Module Control Byte (output data) MSB = Module Status Byte (input data)

Note: Shaded areas represent unavailable data

MSB

MCB

IE8

Analog modules in the same group.

Eight terminal bases per adapter (maximum)

- 4 Analog modules = 1/4 logical rack = 2 I/O groups

MSB

MCB

IE8

Legal Module Placement in 16Ćpt Compact Addressing

A 16Ćpoint input module and a 16Ćpoint output module (or an empty slot) in an I/O group

A block transfer module and another block transfer module (or an empty slot) in an I/O group.

An empty slot and any module (or another empty slot) in an I/O grouop.

2 module positions = an I/O group

MSB MCB

IE8 IE8

20128

MSB MCB

I/O Group

0 1

2 3 4

5 6 7

Input Image Table Output Image Table

00071017 00071017

M2ĆMSB M6ĆMSB

Note: When using block transfer modules in 16Ćpt compact addressing, address module positions

M0, M2, M4 and M6 as module 0" in a block transfer instruction block; address module positions

M1, M3, M5 and M7 as module 1" in a block transfer instruction block.

M0ĆMSB M4ĆMSB

I/O groups 4-7 are available for another adapter.

M2ĆMCB M6ĆMCB

M0ĆMCB M4ĆMCB

Publication 1794ĆUM009D-EN-P - April 2004

3–12 Communicating with FLEX I/O Modules

Complementary Addressing Mode

Use complementary addressing when:

• you are not using combination modules

• you don’t need all the features of FLEX I/O modules

• you can locate equal numbers of input and output modules in

separate chassis

• you want more efficient use of the input/output image table

Complementary Mode - 16Ćpoint

Complementary mode maximizes 2 chassis I/O image table usage when input modules are installed in 1 chassis, and output modules are installed in another chassis. This mode allows 2 modules to occupy a single I/O group.

In complementary mode, with 16-point density, 1 digital input module in the primary chassis, and 1 digital output module in the complementary chassis, or vice versa, form an I/O group. In addition, analog modules can be complemented by another analog module or an empty base. If 32-pt modules are used, only the lowest 16 bits will be available.

16Ćpoint Complementary Addressing

Primary

Adapter Input

S1Ć1 OFF

Complementary

Adapter

S1Ć1 ON

Note: When programming block transfers, address analog modules as module 0 if switch S1Ć1 is on; module 1 if switch S1Ć1 is off.

Output Empty Analog

I/O Group 1 I/O Group 2 I/O Group 3 I/O Group 4 I/O Group 5 I/O Group 6 I/O Group 7I/O Group 0

Output Output Output

Any combination of digital or analog modules.

Empty

Complement of modules in primary chassis, or analog or empty for analog.

Eight terminal bases per adapter (maximum)

2 modules, 1 in primary and 1 in complement represent 1 I/O group

Analog

AnalogInput

Input

Output

Input

Output

20128

Publication 1794ĆUM009D-EN-P - April 2004

3–13Communicating with FLEX I/O Modules

Complementary 16Ćpoint Addressing Example

1 I/O Group

M0 M1 M2 M3 M4 M5 M6 M7

ASB/E

Primary

ASB/E Comp.

IL = Input Low Byte IH = Input High Byte OL = Output Low Byte

OH = Output High Byte

Note: Shaded areas represent unavailable data

IB16

CĆM0 CĆM1 CĆM2 CĆM3 CĆM4 CĆM5 CĆM6 CĆM7

OHILOL

OB16

I/O Group

IH IL

IB16

OH OL OH OL

OB16

MCB = Module Control Byte

MSB = Module Status Byte

Input Image Table Output Image Table

0 1

2 3 4 5 6 7

M0ĆIH M1ĆIH

M3ĆMSB

Empty

OB16

CĆM4ĆMSB

CĆM6ĆILCĆM6ĆIH

- Up to 16 modules = 1 logical rack

MSB

MCB

OE4

Empty

00071017 00071017

M0ĆIL M1ĆIL

M5ĆIL

M7ĆILM7ĆIH

MSB

MCB

IE8 IB16

MSB

MCB

IE8

Legal Module Placement in 16Ćpoint Complementary

Any module or empty slot in any I/O position of the primary chassis; input modules complemented by output modules, or empty slots; output modules complemented by input modules or empty slots; block transfer modules complemented by block transfer modules or empty slots; or empty slots complemented by input, output, or empty slots.

IH IL

OH OL

OB16

CĆM0ĆOH CĆM1ĆOH CĆM2ĆOH

M3ĆMCB M4ĆMCBM4ĆMSB

CĆM5ĆOHM5ĆIH

OH OL

OB16

IB16 OB16

CĆM0ĆOL CĆM1ĆOL CĆM2ĆOL

CĆM4ĆMCB

CĆM5ĆOL

M6ĆOLM6ĆOH

CĆM7ĆOLCĆM7ĆOH

IH IL

IB16

OH OL

Note: When programming block transfer instructions, address analog modules in the primary rack as module

1," and analog modules in the complementary rack as module 0."

Complementary Mode - 8Ćpoint

Complementary mode maximizes chassis I/O image table usage when input modules are installed in one chassis, and output modules are installed in a complementary chassis. This allows four modules to occupy a single I/O group.

In complementary mode, with 8-point density, 2 digital input modules in the primary chassis, and 2 digital output modules in the complementary chassis, or vice versa, form an I/O group. In addition, analog modules must be complemented by an empty base. If higher density modules are used, only the lowest 8 bits will be available.

Publication 1794ĆUM009D-EN-P - April 2004

3–14 Communicating with FLEX I/O Modules

8Ćpoint Complementary Addressing

Any combination of digital or analog modules.

Primary

Input

Adapter

Complementary

Output EmptyEmpty

Adapter

Output Output Output Output Output

Complement of modules in primary chassis, or empty for analog.

Four modules, 2 in the primary and 2 in the complement, represents 1 I/O group

Complementary 8Ćpoint Addressing Example

I/O Group 0

M0 M1 M2 M3 M4 M5 M6 M7

ASB/E

Primary

IA8

IL IL

IA8

AnalogAnalogInput Input Input Input Input

I/O Group 1 I/O Group 2 I/O Group 3I/O Group 0

Eight terminal bases per adapter (maximum)

- up to 16 digital or 8 analog modules = 1/2 logical rack

IA8

MSB MSB

MCB

IE8 IE8

MCB

OL OL

OA8

20128

OA8

CĆM0 CĆM1 CĆM2 CĆM3 CĆM4 CĆM5 CĆM6 CĆM7

ASB/E Comp.

IL = Input Low Byte IH = Input High Byte OL = Output Low Byte

OH = Output High Byte

Note: Shaded areas represent unavailable data

OA8

I/O Group

0 1

2 3 4

5 6 7

OL OL

OA8

MCB = Module Control Byte

MSB = Module Status Byte

Input Image Table Output Image Table

M1ĆIL M3ĆIL

M5ĆMSB

CĆM7ĆIL

OA8

M0ĆIL M2ĆIL

M4ĆMSB

CĆM6ĆIL

I/O groups 4-7 are available to additional adapters.

OA8

Legal Module Placement in 8Ćpoint Complementary

2 inputs in a group complemented by 2 outputs or empty slots 2 outputs in a group complemented by 2 inputs or empty slots 2 block transfer modules complemented by 2 empty slots 1 block transfer module and 1 input in a group complemented

by 1 empty slot and 1 output module Empty slots complemented by an empty slot, input or output slot

00071017 00071017

Empty Empty

CĆM1ĆOL CĆM3ĆOL

M5ĆMCB

M7ĆOL

IL IL

IA8 IA8

CĆM0ĆOL CĆM2ĆOL M4ĆMCB

M6ĆOL

Publication 1794ĆUM009D-EN-P - April 2004

3–15Communicating with FLEX I/O Modules

Complementary - 32 Addressing

Use complementary 32 point addressing when:

• you use 32 point modules in your system

• you need full FLEX I/O module functionality, such as delay time

selection on input modules, fuse-blown indication on the 1794-OB8EP, etc.

• using combination modules, such as the 1794-IB16XOB16 16

in/16 out module In complementary mode, each module position equals two I/O groups – 2 words of input image and 2 words of output image.

Complementary 32 Addressing Example - 16 modules = 2 logical racks, N, (N+1), NC and (N + 1)C

Rack N Rack (N + 1)

Group4&5 Group6&7

OHL

OLH OLL OL IHH IHL

OHH

OHL

Group0&1

MSB

MCB

Group2&3

MSB MCB

Rack NC Rack (N + 1)C

OH OL

Input 32

Empty

Analog Input 8

MSB

MCB

ASB/E

Primary

ASB/E Comp.

Group0&1

Group2&3

M0 M1 M2 M3 M4 M5 M6 M7

Input 32 Output 32 Empty

ILH ILL

IHH IHL

CĆM0 CĆM1 CĆM2 CĆM3 CĆM4 CĆM5 CĆM6 CĆM7

Output 32

OHH

OLH OLL IHH IHLILH ILL

OHL

OHH

OLH OLL OL

Input 32 Output 16

Group4&5 Group6&7

Output 8 Input 32Analog AnalogOutput 32

ILH ILL

Output 32

OHH

OLH OLLIHH IHLILH ILL

OHL

Eight terminal bases per adapter (maximum) 1 module in primary chassis, 1 module in complementary

chassis represents 2 I/O groups. ILL, OLL = Bits 0 thru 7 for input and output words of 32 point modules ILH, OLH = Bits 8 thru 15 for input and output words of 32 point modules

IHL, OHL = Bits 16 thru 23 for input and output words of 32 point modules IHH, OHH = Bits 24 thru 32 for input and output words of 32 point modules IL, OL = Bits 0 thru 7 for input and output words for 16 and 8 point modules

IH, OH = Bits 8 thru 15 for input and output words for 16 point modules

Note: Shaded areas represent unavailable data

Input Image Table for Rack N and NC Output Image Table for Rack N and NC

I/O Group

0 1

1 2

2 3

3 4

4 5

5 6

6 7

M0ĆILH

M0ĆIHH

M1ĆILH M1ĆOLLM1ĆOLLM1ĆOLHM1ĆOLH

CM1ĆILH

CM1ĆIHH

M1ĆIHHM1ĆIHH

CM3ĆILH

M3ĆILHM3ĆILH

CM3ĆIHH

M3ĆIHH

M0ĆILL

M0ĆILLM0ĆILL M0ĆIHLM0ĆIHL

M1ĆILLM1ĆILL

CM1ĆILL

CM1ĆIHL

M1ĆIHLM1ĆIHL

CM3ĆILL

M3ĆILLM3ĆILL

CM3ĆIHL

M3ĆIHLM3ĆIHL

00071017 00071017

Input Image Table for Rack N+1 and (N+1)C

I/O Group

0 1

1 2

2 3

3 4

4 5

5 6

6 7

M4ĆMSB

M5ĆMSB

M1ĆILH

M7ĆILH

M3ĆILHM3ĆILH

M7ĆIHH

M3ĆIHH

CM5ĆMSB

M1ĆILLM1ĆILL

CM6ĆIL M6ĆOL

M2ĆILLM2ĆILL

M3ĆILLM3ĆILL

M3ĆIHLM3ĆIHL

00071017

M7ĆILL M7ĆIHL

Legal Module Placement in 32Ćpoint Complementary

Any module in any slot in primary chassis. Complement of primary chassis module in complementary chassis slot. Any input module complemented by an output module or empty slot. Any output module complemented by an input module or empty slot. Any block transfer module complemented with a block transfer module or empty slot.

An empty slot complemented by an empty slot, input or output module

I/O GroupI/O Group

00 11

11 22

22 33

33 44

44 55

55 66

66 77

CM0ĆOLH

M0ĆOLH

CM0ĆOHH

M0ĆOHH M1ĆOLH

M1ĆOHH M2ĆOLHM2ĆOLH

CM2ĆOH

M2ĆOHHM2ĆOHH M3ĆOLH

M3ĆOLH M3ĆOHH

M3ĆOHH

CM0ĆOLL

M0ĆOLL

CM0ĆOHL

M0ĆOHL

M1ĆOLL

M1ĆOHL

M1ĆOHLM1ĆOHLM1ĆOHHM1ĆOHH

CM2ĆOL

M2ĆOLH M2ĆOHL

M3ĆOLL

M3ĆOHL

Output Image Table for Rack N+1 and (N+1)C

I/O Group

0 1

1 2

2 3

3 4

4 5

5 6

6 7

M4ĆMCB

M5ĆMCB

CM7ĆOLH

M3ĆILHM3ĆILH

CM7ĆOHH

M3ĆIHH

CM5ĆMCB

M1ĆIHLM1ĆIHL

M2ĆILLM2ĆILL

CM7ĆOLL

M3ĆILLM3ĆILL

CM7ĆOHL

M3ĆIHLM3ĆIHL

00071017

Publication 1794ĆUM009D-EN-P - April 2004

3–16 Communicating with FLEX I/O Modules

Mapping Data into the Image Tables

After the rack size has been determined by the remote I/O adapter, the data from the modules must be mapped into the data tables. Data associated with digital modules is mapped into the input and output image table.

Data transfer to and from the remote I/O adapter and digital modules occurs every flexbus scan. This data is mapped into the input/output image table.

The switch settings on the adapter module

IMPORTAN

For analog modules, only the MSB and MCB block transfer bytes are mapped into the input and output image table. The remote I/O adapter transfers data to analog I/O modules (block transfer write) and from analog I/O modules (block transfer read) using BTW and BTR instructions in your ladder diagram program. This data is mapped to the data files selected in the ladder logic block transfer instructions.

The adapter identifies the type of module in each base unit when the module is added, and stores this information for later use, if necessary.

determine whether both the input and output bits are transferred. Standard addressing is the only mode that maps both input and output bits for each module.

Determining Rack Size

If you are changing your configuration, you

IMPORTANT

ATTENTION

After the remote I/O adapter has identified the modules present in its system, it creates a “rack image” so data transfer can take place using the remote I/O protocol.

Building a rack image consists of:

must power down, then power back up after changing a module type in a terminal base unit.

In Standard Addressing Mode, FLEX I/O modules do not support complementary I/O. Do not attempt to use the complementary image table word of a module in Standard Addressing Mode. The complementary word is reserved for use by the module.

• mapping each module to an I/O group (16 bits of input and 16

bits of output)

• determining rack size – all empty terminal bases are counted

unless they occur at the end of the rack

• automatically sizing the rack image, based upon the mode switch

setting

Publication 1794ĆUM009D-EN-P - April 2004

• smallest rack size is 1/4, regardless of the mode switch settings

Some examples of rack definition are shown below.

Example 1-8Terminal Bases, 8 Modules

Adapter

= 2 Logical Racks in Standard 32 mode, any density or analog module mix = 1 Logical Rack in Standard mode, any density or analog module mix

= 1/4 Rack in Compact mode with 8Ćpt modules; 1/2 Rack in Compact mode (with 16Ćpt modules)

Module Module Module Module

Example 2 - 16 Terminal Bases, 16 Modules, Complementary Mode

PrimaryĆ

Adapter

Module Module Module Module

3–17Communicating with FLEX I/O Modules

Complement

Adapter

Module Module Module Module Module Module Module Module

= 2 Logical Racks in Complementary 32 mode (16 modules total, any density), = 1 Logical Rack in Complementary mode (16 16Ćpt modules), primary input modules - complement

output modules and vice versa; analog complemented with another analog module or an empty slot

= 1/2 Rack in Complementary mode (16 8Ćpt modules), primary input modules - complement output

modules and vice versa; analog complemented with an empty slot

Last

Module

Position

0 1/4 rack 1/4 rack 1/4 rack 1/4 rack 1/4 rack 1/4 rack 1/4 rack

1 1/2 rack 1/4 rack 1/4 rack 1/4 rack 1/2 rack 1/4 rack 1/4 rack

2 3/4 rack 1/2 rack 1/4 rack 1/4 rack 3/4 rack 1/2 rack 1/4 rack

3 Full rack 1/2 rack 1/4 rack 1/4 rack Full rack 1/2 rack 1/4 rack

4 1-1/4 rack 3/4 rack 1/2 rack 1/4 rack 1-1/4 rack 3/4 rack 1/2 rack

Standard32Standard Compact16Compact8Complement32Complement16Complement 8

Rack Size for each Addressing Mode

5 1-1/2 rack 3/4 rack 1/2 rack 1/4 rack 1-1/2 rack 3/4 rack 1/2 rack

6 1-3/4 rack Full rack 1/2 rack 1/4 rack 1-3/4 rack Full rack 1/2 rack

7 2 Full racks Full rack 1/2 rack 1/4 rack 2 Full racks Full rack 1/2 rack

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3–18 Communicating with FLEX I/O Modules

If a rack size offset by the selected quarter results in more than a full rack, the adapter will declare a rack fault and error as indicated.

In 32 point mode, the starting quarter should always be 0 (switches S1–8 and S1–7 on).

Operating Modes

ATTENTION

Most reset commands are issued by the processor when it is placed in the PROG mode. However, the processor automatically issues a special command to any rack declared faulted regardless of the processor mode.

When this special command is received by the faulted remote I/O adapter, and processor restart lockout (PRL) has not been selected, the adapter will:

Do not use the auto-config feature of 6200 software when using a PLC-3 processor with 1775-S4A or 1775-S4B scanner modules. If you do an auto-config for a scanner channel containing 1 or more 1794-ASB adapters with that configuration, the adapters may not show up in the scan list for that scanner channel. Manually insert these adapters into the scan list for the scanner.

• continue to read output image data from the link, and queue block

transfers if MCBs are detected

• reset all bits in the output words of digital modules

• reset all bits in the write words of analog modules up to but not

including the write words of the safe state values

• assigns safe state values to outputs of analog modules

• issue a reply command

If processor restart lockout (PRL) has been selected, the adapter does not update data, does not issue a reply command, and does not clear the fault.

Chapter Summary

Publication 1794ĆUM009D-EN-P - April 2004

In this chapter, you learned how to address your I/O, how to determine rack size, and how the modules are mapped

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Chapter Objectives

Fault Conditions

In this chapter, we tell you:

• about the indicators on the module front plate

• how to use the indicators for troubleshooting the module

Three conditions can cause the remote I/O adapter to declare a communication fault.

• no remote I/O (link) communication for more than 100ms

• no commands issued to this address over the remote I/O link

within the last 255 link transactions

• communication is lost to a module when Rack Fault Select is

enabled

When any of these conditions exist, the adapter will:

• reset all digital outputs or leave them in their last state (depending

on the position of the last state switch, S2-1). Refer to page 2–9 for an explanation of analog module responses.

A communication fault will be automatically cleared by a command from the processor if PRL (processor restart lockout) is not selected, or by pressing the reset switch on the front of the module if PRL is selected.

Troubleshooting with the Indicator Lights

ADAPTER

FAULT

LOCAL



FAULT

Local Fault

Adapter Fault

Adapter Active

Power ON/OFF

Reset Switch

PWR

ACTIVE

Important: Cycling power to the adapter will also reset faults.

However, any queued block transfers will be lost, and all outputs will turn off, regardless of the position of the last state switch.

The module has indicators on the front plate as shown below. Use these indicators for troubleshooting the module. The following tables describes problems that may occur, probable causes, and recommended courses of action.

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4–2 Troubleshooting

Possibly module removed

All other modules: Outputs active

Adapter Fault

Adapter Active

Local Fault

Table 4.A Remote I/O System Troubleshooting Guide

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ADAPTER

ACTIVE

FAULT

LOCAL

FAULT

PWR

Communication States and Module Display

Local

Fault

Off Off On Normal Communications

Adapter

Fault

Adapter

Active

Operating State Actions Fault Reset

Outputs enabled. Communicating with scanner

Outputs disabled

Off Off Blinking Program or Test mode

Communicating with scanner Sending current input status back to scanner.

All modules; digital outputs in the

Off Off Off

Communication (lack of communications)

rack follow HLS setting. Refer to page 2-9 for analog output action.

Off Blinking alternately

Processor lockout in effect during communications by scanner

Outputs follow last state switch setting. No replies sent to scanner

Module Faults

Local

Fault

Adapter

Fault

Adapter

Active

Fault Condition Actions Fault Reset

On On Off Noise problems on I/O bus All outputs off. Communications off.

Following

On Off

Link

Status

Blinking Off On

Processor in RUN mode

Rack Fault Select NOT enabled

Different module installed replacing removed module.

Module not responding.

under power. Only module removed is affected.

Old inputs maintained. Outputs set to zero.

Module not responding: Old inputs maintained. Outputs set to zero.

(enabled). Sending current input status back to scanner.

Not applicable

Resume proper communications (if no processor restart lockout)

Press Reset button on front of adapter module (or cycle power) and resume proper communication.

Cycle power. (This fault is a fatal fault.)

AutoĆreset when incorrect module is removed; or cycle power to establish new identification for module.

Replace same module; or cycle power to establish new identification for module.

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Local

Possibly module removed

All other modules: Outputs

Possibly module removed

Not applicable. SW2

)

correct fault.)

Fault

Blinking OFF Blinking

Processor in PROG/TEST mode

Rack Fault Select NOT enabled

Adapter

Fault

Adapter

Active

Module not responding.

under power. Only module removed is affected.

Module Faults

Module not responding: Old inputs maintained. Outputs set to to zero.

disabled. Sending current input status back to scanner.

4–3Troubleshooting

Fault ResetActionsFault Condition

Replace same module; or cycle power to establish new identification for module.

Blinking Off Blinking

Processor in RUN/PROG/TEST

Rack Fault Select enabled

Local

Fault

Off Blinking in unison Incorrect starting I/O group number.

On On On Incorrect baud rate setting.

Blinking On Off

Local Fault

Off On Off

Adapter

Fault

Blinking in sequence

Adapter

Fault

Adapter

Active

Adapter

Active

Module not responding.

under power. Only module removed is affected.

Configuration Faults

Fault Condition Actions Fault Reset

Another adapter on the link has the same address.

Illegal module placement - compact addressing mode selected.

Additional Faults and Module Displays

Fault Condition Actions Fault Reset

Random Access Memory fault.

Read Only Memory fault (on powerup only).

Internal watchdog timer timed out.

Module not responding. All outputs set to 0. All other modules; digital outputs in the rack follow HLS setting. Refer to page 2-9 for analog output action. No replies sent to scanner.

Not applicable.

Reset outputs. Stop communicating on remote I/O link.

Outputs remain reset. Communication never starts.

Try to reset outputs. Stops communicating on the remote I/O link.

Replace same module; or cycle power to establish new identification for module.

Turn power off. Set SW1 and

correctly.Turn power on.

Correct module placement and cycle power.

Cycle power. (This may not correct fault. If this does not correct the fault, replace the module with a known goodmodule, andreturntheba module to the factory for repair.

Chapter Summary

In this chapter you learned how to use the indicators on the front of the module to troubleshoot your module.

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4–4 Troubleshooting

Publication 1794ĆUM009D-EN-P - April 2004

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1794ĆASB Series E Specifications

Note: This adapter cannot be used with PLCĆ2 processors This adapter can communicate with FLEX Integra analog

modules and 32-point FLEX modules.

I/O Capacity 8 modules

Power Supply Note: In order to comply with CE Low Voltage Directives, you must use a Safety

Input Voltage Rating 24V dc nominal

Input Voltage Range 11.0V to 31.2V dc (includes 5% ac ripple)

Communication Rate 57.6k bps

Indicators Power - green

Flexbus Output Current 640mA maximum

Isolation Voltage 500V ac between user power and flexbus

Power Consumption 330mA at 24V; 730mA at 12V

Power Dissipation 4.6W maximum @ 31.2V dc

Thermal Dissipation 15.7 BTU/hr @ 31.2V dc

Environmental Conditions

Operating Temperature

Storage Temperature IEC 60068-2-1 (Test Ab, Unpackaged, Nonoperating Cold)

Relative Humidity IEC 60068-2-30 (Test Db, Unpackaged, Nonoperating Damp Heat)

Shock

Operating Nonoperating

Vibration IEC 60068-2-6 (Test Fc, Operating)

ESD Immunity IEC 61000-4-2

Radiated RF Immunity IEC 61000-4-3

EFT/B Immunity IEC 61000-4-4

Specifications continued on next page

Extra Low Voltage (SELV) or a Protected Extra Low Voltage (PELV) power supply to power this adapter.

115.2k bps

230.4k bps

Adapter Active - green Adapter fault - red Local fault - red

IEC 60068-2-1 (Test Ad, Operating Cold) IEC 60068-2-2 (Test Bd, Operating Dry Heat) IEC 60068-2-14 (Test Nb, Operating Thermal Shock)

32 to 131°F(0to55°C)

IEC 60068-2-2 (Test Bb, Unpackaged, Nonoperating Dry Heat) IEC 60068-2-14 (Test Na, Unpackaged, Nonoperating Thermal Shock)

-40 to 185°F (-40 to 85°C)

5 to 95%, noncondensing

IEC 60068-2-27 (Test Ea, Unpackaged Shock) 30g 50g

5g @ 10-500Hz

4kV contact discharges 8kV air discharges

10V/m with 1kHz sine-wave 80% AM from 30MHz to 2000MHz

+4kV @ 2.5kHz on power ports

2kV @ 5kHz on communications ports

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Publication 1794ĆĆUM009D-EN-P - April 2004

Specifications A–2

1794ĆASB Series E Specifications

Surge Transient Immunity IEC 61000-4-5

1kV line-line (DM) and +2kV line-earth (CM) on signal ports

Conducted RF Immunity IEC 61000-4-6

10V rms with 1kHz sine wave 80% AM from 150kHz to 80MHz

Emissions CISPR 11

Group 1, Class A (with appropriate enclosure)

Enclosure Type Rating None (open-style)

Remote I/O Cable Belden 9463 or equivalent as specified in publication ICCGĆ2.2

Remote I/O Connector Plug Part Number 942029-03

Power Conductors

Wire Size

Rockwell Automation 1794-ASBE User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual