Allen-Bradley Series B User manual

User
Manual
DeviceNet
Adapter Module
(Cat. No. 1794ADN Series B)
AllenBradley

Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this control
equipment 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.
The illustrations, charts, sample programs and layout examples shown in
this guide are intended solely for example. Since there are many
variables and requirements associated with any particular installation,
Allen-Bradley 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 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.
Reproduction of the contents of this copyrighted publication, in whole or
in part, without written permission of Allen–Bradley Company, Inc.
is prohibited.
Throughout this manual we make notes to alert you to possible injury to
people or damage to equipment under specific circumstances.
!ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death,
property damage, or economic loss.
Attention helps you:
•identify a hazard
•avoid the hazard
•recognize the consequences
Important: Identifies information that is especially important for
successful application and understanding of the product.
Important: We recommend you frequently backup your application
programs on appropriate storage medium to avoid possible
data loss.
DeviceNet, DeviceNetManager, and RediSTATION are trademarks of Allen-Bradley Company, Inc.
PLC, PLC–2, PLC–3, and PLC–5 are registered trademarks of Allen-Bradley Company, Inc.
Windows is a trademark of Microsoft.
Microsoft is a registered trademark of Microsoft
IBM is a registered trademark of International Business Machines, Incorporated.
All other brand and product names are trademarks or registered trademarks of their respective companies.
Important User Information

Publication 17946.5.5 - October 1996
Summary of Changes
This publication contains new and revised information not included
in the last release.
New Information
Additional Flex I/O Modules
The following modules have been added to this publication:
•8 Electronically Fused Output Module, cat. no. 1794-OB8EP
•10 Input/6 Output Module, cat. no. 1794-IB10XOB6
•SCANport Module, cat. no. 1203-FM1
Revised Information
All screens for selection and configuration of the Flex I/O adapter
and modules have been updated. New buttons have been added to the
screens for ease of movement between screens.
The “Set to Defaults” button has been changed to “Set to I/O Only.”
This applies the real time values for I/O (optimal settings) to the
module.
A “Memory” button has been added to the individual configuration
screen for each module. If you change your mind about any settings
you have made while you are on the configuration screen, clicking
on the “Memory” button returns you to the original settings.
The “Save to Flex I/O” no longer both saves and exits you. You must
click on the “Close” button to exit.
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.

Summary of Changes -1. . . . . . . . . . . . . . . . . . . . . . . . . . . .
New Information -1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Additional
Flex I/O Modules -1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Revised
Information -1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Change Bars -1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About This Manual P-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Purpose P-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audience P-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Vocabulary P-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
What This Manual Contains P-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Conventions P-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Related
Publications P-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installing Y our DeviceNet Adapter Module 1-1. . . . . . . . . . . . .
Chapter Objectives 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compliance to European Union Directives 1-1
. . . . . . . . . . . . . . . . . .
EMC Directive 1-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low V
oltage Directive 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
The
FLEX I/O System 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DeviceNet Adapter Components 1-2
. . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Indicators 1-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements 1-3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting the DeviceNet Adapter 1-3
. . . . . . . . . . . . . . . . . . . . . . . . .
Mounting
on the DIN Rail 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mounting on a Wall or Panel 1-4
. . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Network Address Switch 1-6
. . . . . . . . . . . . . . . . . . . . . . .
Wiring 1-7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 1-8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Communication T akes Place and I/O Image
Table Mapping 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication Over the Flex I/O Backplane 2-1
. . . . . . . . . . . . . . . .
I/O Structure 2-2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Input Status Word 2-3
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Communication Choices 2-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents

Table of Contentsii
Mapping Data into the Image T able 2-4. . . . . . . . . . . . . . . . . . . . . . .
16point Discrete Input Module (1794IB16) Image Table Mapping 2-5
Memory Map of 16Point Discrete Input Module
Image T able - 1794IB16 2-5. . . . . . . . . . . . . . . . . . . . . . . .
Input Delay Times for the 1794IB16 Input Module 2-5
. . . . . . . . .
16point Discrete Output Module (1794OB16) Image
Table Mapping 2-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Map of 16Point Discrete Output Module Image
Table - 1794OB16 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . .
16point
Discrete Input/Output Module Image T able Mapping -
1794IB10XOB6 2-6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory
Map of 16Point Discrete Input/Output Module
Image T able - 1794IB10XOB6 2-6. . . . . . . . . . . . . . . . . . .
8point Discrete Electronically Fused Output Module
(1794OB8EP) Image Table Mapping 2-7. . . . . . . . . . . . . . . . .
Memory Map of 8Point Discrete Electronically Fused
Output Module Image T able - 1794OB8EP 2-7. . . . . . . . . .
8point Discrete Sensor Input Module (1794IB8S) Image
Table Mapping 2-8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Map of 8Point Discrete Sensor Input Module
Image T able - 1794IB8S 2-8. . . . . . . . . . . . . . . . . . . . . . .
Input Delay Times for the 1794IB8S Input Module 2-8
. . . . . . . .
8point Discrete Input Module (1794IA8) Image Table Mapping 2-9
.
Memory Map of 8point Discrete Input Module Image
Table - 1794IA8 2-9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Delay Times for the 1794IA8 Input Module 2-9
. . . . . . . . .
8point Discrete Output Module (1794OA8) Image Table Mapping 2-10
Memory Map of 8point Discrete Output Module Image
Table - 1794OA8 2-10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8point Discrete Relay Output Module (1794OW8) Image
Table Mapping 2-10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Memory Map of 8Point Discrete Relay Output Image Table -
1794OW8 2-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8 Input Analog Module (Cat. No. 1794IE8) Image Table Mapping 2-11
Memory Map of Analog Input Module Image Table - 1794IE8 2-11
Range Selection Bits for the 1794IE8 Analog Input Module 2-12. .
Word/Bit Descriptions for the 1794IE8 Analog Input
Module Write 2-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Output Analog Module (1794OE4) Image Table Mapping 2-13
. . . .
Memory
Map of Analog Output Module Image
Table - 1794OE4 2-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Range Selection Bits for the 1794OE4 Analog Output
Module (Write Word 6) 2-14
. . . . . . . . . . . . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794OE4 Analog Output Module 2-14
Analog Combo Module (1794IE4XOE2) Image Table Mapping 2-16.
Memory Map of Analog Combo Module Image
Table - 1794IE4XOE2 2-16. . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents iii
Range Selection Bits for the 1794IE4XOE2 Analog
Combo Module 2-17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794IE4XOE2 Analog
Combo Module 2-17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RTD Input Analog Module (1794IR8) Image Table Mapping 2-19
. . .
RTD Analog Input Module (1794IR8) Read 2-19
. . . . . . . . . . . . .
RTD Analog Input Module (1794IR8) Write 2-20
. . . . . . . . . . . . . . .
Word/Bit Descriptions for the 1794IR8 RTD Analog
Input Module 2-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermocouple Input Module (1794IT8) Image Table Mapping 2-23
. .
Thermocouple Input Module (1794IT8) Read 2-23
. . . . . . . . . . . .
Thermocouple Input Module (1794IT8) Write 2-24
. . . . . . . . . . . .
Word/Bit Descriptions for the 1794IT8 Thermocouple
Input Module 2-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SCANport Module (1203FM) Image Table Mapping 2-27
. . . . . . . . .
Memory Map of SCANport Module Image Table - 1203FM 2-27
. .
Defaults 2-28
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Y our DeviceNet Adapter Offline 3-1. . . . . . . . . . .
Chapter Objectives 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About DeviceNet Manager 3-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adding Your Flex I/O DeviceNet Adapter to the Network 3-1
. . . . . . . .
Configuring Your Flex I/O Adapter and System Offline 3-3
. . . . . . . . . .
Configuring Your Adapter'
s Flex I/O System 3-5. . . . . . . . . . . . . . .
Configure
Slot 0 3-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 1 3-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 2 3-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 3 3-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 4 3-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 5 3-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 6 3-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 7 3-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration for 1794OW8 Relay output module 3-14
. . . . . . . . . . .
Configuration for the 1794OE4 Analog Output module 3-15
. . . . . . .
Configuration for the 1794IT8 Thermocouple Input module 3-16
. . . .
Configuration for the 1794IB10XOB6 10 Input/6 Output Module 3-17
.
Configuration for the 1794OB8EP Electronically Fused
Output Module 3-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration for the 1203FM1 SCANport Module 3-19
. . . . . . . . . .
Configuring the Adapter 3-20
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Viewing the Mapping Summaries 3-21
. . . . . . . . . . . . . . . . . . . . . . .

Table of Contentsiv
Configuring Y our DeviceNet Adapter Online 4-1. . . . . . . . . . .
Chapter Objectives 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About DeviceNet Manager 4-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Your Flex I/O Adapter and System Online 4-1
. . . . . . . . . .
The Configuration Screen 4-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load from Device 4-4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load
from a File 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Entering Configuration Information into the Configuration Screen 4-7
Configuring Your Adapter' s Flex I/O System 4-8. . . . . . . . . . . . . . .
Configure
Slot 0 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure Slot 1 and 2 4-10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 3 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 4 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure Slots 5 and 6 4-11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configure
Slot 7 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Applying
Configuration Information to the Adapter 4-13. . . . . . . . . . .
Viewing the Mapping Summaries 4-14
. . . . . . . . . . . . . . . . . . . . . . .
Using Mini Who and Network Who 4-16
. . . . . . . . . . . . . . . . . . . . . . . .
Using Mini Who 4-16
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Using Network Who 4-17
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Objectives 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting With the Indicators 5-1
. . . . . . . . . . . . . . . . . . . . . . .
Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Support Services 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Support 5-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Engineering and Field Services 5-1
. . . . . . . . . . . . . . . . . . . . . . . .
Technical Training 5-1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair and Exchange Services 5-1
. . . . . . . . . . . . . . . . . . . . . . . .

Preface
17946.5.5 - October 1996
About This Manual
Use this manual to install and configure your Flex I/O DeviceNetTM
Adapter, cat. no. 1794-ADN Series B.
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 addition, you must be familiar with:
•DeviceNet Manager Software, cat. no. 1787-MGR
•Microsoft WindowsTM
•Flex I/O system components
In this manual, we refer to:
•the individual DeviceNet adapter module as the “adapter.”
•the programmable controller as the “controller” or the
“processor.”
The contents of this manual are as follows:
Chapter Title What's Covered
1Overview of Flex I/O and Your
DeviceNet Adapter
Describes features, capabilities, and hardware
components.
2How Communication Takes Place
and I/O Mapping
Describes communication over the I/O backplane
between the modules and the adapter, and how data is
mapped into the image table.
3Configuring Your DeviceNet Adapter
Offline
Describes how to configure the adapter when in the
offline mode.
4Configuring Your DeviceNet Adapter
Online
Describes how to configure the adapter when in the
online mode.
5 Troubleshooting Explains how to use the indicators for troubleshooting.
Appendix
A Specifications Adapter specifications
Purpose
Audience
Vocabulary
What This Manual
Contains

SP–2 About This Manual
17946.5.5 - October 1996
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 on planning and installing your
DeviceNet system, and Flex I/O modules, see the following
publications:
Publication Publication Number
DeviceNet Manager Software User Manual 17876.5.3
Scanner Configuration Manual (cat. no. 1771SDN) 17716.5.118
Industrial Automation Wiring and Grounding Guidelines 17704.1
Flex I/O Product Data 17942.1
16 Source Output Module, Cat. No. 1794OB16 17945.3
16 Sink Input Module, Cat. No. 1794IB16 17945.4
4 Output Analog Module, Cat. No. 1794OE4 17945.5
8 Input Analog Module, Cat. No. 1794IE8 17945.6
8 Sensor Input Module, Cat. No. 1794IB8S 17945.7
8 Input Module, Cat. No. 1794IA8 17945.9
8 Output Module, Cat. No. 1794OA8 17945.10
4 in/2 out Analog Combo Module, Cat. No. 1794IE4XOE2 17945.15
8 Relay Output Module, Cat. No. 1794OW8 17945.19
Thermocouple/mV Input Module, Cat. No. 1794IT8 17945.21
10 Input/6 Output Module, Cat. No. 1794IB10XOB6 17945.24
RTD 8 Input Analog Module, Cat. No. 1794IR8 17945.22
SCANport Module, Cat. No. 1203FM1 12035.8
Conventions
Related Publications

Chapter 1
Publication 17946.5.5 - October 1996
Installing Your DeviceNet
Adapter Module
This chapter describes the FLEX I/O system, the DeviceNet Adapter
and the procedures for installing your DeviceNet adapter module.
These include:
•European Union Directives
•the FLEX I/O system
•power requirements
•mounting the remote I/O adapter
•setting the module switches
•connecting the wiring
If this product has the CE mark it is approved for installation within
the European Union and EEA regions. It has been designed and
tested to meet the following directives.
EMC Directive
This product is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and the following standards,
in whole or in part, documented in a technical construction file:
•EN 50081-2EMC – Generic Emission Standard, Part 2 –
Industrial Environment
•EN 50082-2EMC – Generic Immunity Standard, Part 2 –
Industrial Environment
This product is intended for use in an industrial environment.
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC
Low Voltage, by applying the safety requirements of EN 61131–2
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
•Automation Systems Catalog, publication B111
Chapter Objectives
Compliance to
European Union Directives

1–2 Installing Your DeviceNet Adapter Module
Publication 17946.5.5 - October 1996
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 as shown
below:
Adapter/Power Supply Terminal Base I/O Module
20125
•DeviceNet 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
For information on how communication occurs on the Flex I/O
system backplane, refer to Chapter 2.
The adapter module consists of the following major components:
•diagnostic indicators
•DeviceNet wiring connections
•24V dc power wiring connections
•Node address switch
I/O Status Indicator
Mod/Net Status Indicator
DeviceNet Connector
DeviceNet Wiring Diagram
Node Address
Thumbwheel Switch
+24V dc Wiring
Connections
24V dc Common
Wiring Connections
Power Indicator
The FLEX I/O System
DeviceNet Adapter
Components

1–3 Installing Your DeviceNet Adapter Module
Publication 17946.5.5 - October 1996
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:
Mod/Net status
I/O status
A complete description of the diagnostic indicators and how to use
them for troubleshooting is explained in Chapter 5.
The DeviceNet adapter module requires a current of 400mA at
24V dc from an external power supply for Flex bus operation This is
sufficient to support one logical rack (8 modules). Remember to add
this amount to current requirements for other modules using the
same 24V supply.
The DeviceNet adapter module can be DIN rail or wall/panel
mounted. Refer to the specific method of mounting below.
Mounting on the DIN Rail
B
C
A
1. Position the 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.
Power Requirements
Mounting the DeviceNet
Adapter

1–4 Installing Your DeviceNet Adapter Module
Publication 17946.5.5 - October 1996
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.
4. 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.
5. Connect the adapter wiring as shown under “Wiring” later in this
document.
Important: Make certain that the DIN rail is properly grounded to
the panel. Refer to “Industrial Automation Wiring and
Grounding Guidelines,” publication 1770-4.1.
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.
1.4
(35)
Inches
(Millimeters)
3.4
(87)
3.2
(80)
2.7
(68) 3.7
(94)
3.2
(80)
3.7
(94)
1794 Terminal Base Units
3.7H x 3.7W x 2.7D
(94H x 94W x 69D)
.83 (21)
0.9
(23)
2.3
(59)
1794 Adapters
3.4H x 2.7W x 2.7D
(87H x 68W x 69D)
1.4
(35)
3.7
(94)
2.0
(50)
1.2
(30)
A
A= Mounting hole dimensions for optional
mounting kit
More

1–5 Installing Your DeviceNet Adapter Module
Publication 17946.5.5 - October 1996
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).
Important: Make certain that the mounting plate is properly
grounded to the panel. Refer to “Industrial Automation
Wiring and Grounding Guidelines,” publication
1770-4.1.
1.4
(35.5)
1- Adapter Mounting Plate
2- DeviceNet 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.
5. Press the module down flush with the panel until the locking
lever locks.
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.
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.
More

1–6 Installing Your DeviceNet Adapter Module
Publication 17946.5.5 - October 1996
Set the network address using the 2-position thumbwheel switch.
Valid settings range from 00 to 63. Press either the + or – buttons to
change the number.
Network Address Switches
Note: The baud rate for the adapter is set by way of “baud detection”
at power-up.
The setting of the network address cannot be changed using the
DeviceNet configuration software (DeviceNet Manager).
Setting the Network
Address Switch

1–7 Installing Your DeviceNet Adapter Module
Publication 17946.5.5 - October 1996
Connect external wiring to the DeviceNet adapter as shown below.
DF
G
E
20131
24V
COM
DeviceNet Connector
1. Connect the DeviceNet cable to the removable connector as
shown.
Connect To
BLK Wire -V
BLU Wire CAN* Low
Bare Wire Drain
WHT Wire CAN High
RED Wire +V
CAN = Controller Area Network
NOTE: Cable colors are shown on the wiring label on the front of the
module.
2. Insert connector into mating connector on DeviceNet adapter
module.
3. Connect +24V dc input to the left side of the lower connector E.
4. Connect 24V common to the left side of the upper connector D.
5. Connections Gand Fare used to pass 24V dc power (G) and 24V
common (F) to the next module in the series (if required).
For example:
Wiring when total current draw is less than 10A
Daisychaining
24V dc
Wiring

1–8 Installing Your DeviceNet Adapter Module
Publication 17946.5.5 - October 1996
In this chapter you learned about the FLEX I/O system, how to
install your DeviceNet adapter module and set your switches.
Chapter 2 tells you how to communicate with your system.
Chapter Summary

Chapter 2
Publication 17946.5.5 - October 1996
How Communication Takes
Place and I/O Image Table
Mapping
In this chapter, you will learn about:
•communication over the Flex I/O backplane (between the
DeviceNet adapter and the I/O modules)
•how data is mapped into the I/O image table
One 1794-ADN DeviceNet adapter can interface with up to eight
terminal base units with installed Flex I/O modules, forming a Flex
I/O system of up to eight slots. The adapter communicates to other
network system components (typically one or more controllers or
scanners, and/or programming terminals) over the DeviceNet
network. The adapter communicates with its I/O modules over the
backplane.
Inputs
Status
Outputs
Configuration
Slot 0
I/O Module
Read
Words
Write
Words
0
15
Read
Write
DeviceNet
Adapter
Inputs
Status
Outputs
Configuration
Slot 1
I/O Module
Inputs
Status
Outputs
Configuration
Slot 7
I/O Module
Network
The I/O map for a module is divided into read words and write
words. Read words consist of input and status words, and write
words consist of output and configuration words. The number of
read words or write words can be 0 or more. The length of each I/O
module’s read words and write words vary in size depending on
module complexity. Each I/O module will support at least 1 input
word or 1 output word. Status and configuration are optional,
depending on the module.
Chapter Objectives
Communication Over the
Flex I/O Backplane

2–2 How Communication Takes Place and I/O Image Table Mapping
Publication 17946.5.5 - October 1996
For example, a 16 point discrete input module will have up to 2 read
words and 1 write word.
Module Image
Inputs
Delay
Time
Input Size
Output Size
1 or 2 W ords
0 or 1 W ord
I/O Image
Not used
16point Discrete Input Module
Delay
Time
Not used
Check the I/O map for each module for the exact mapping.
Output data is received by the adapter in the order of the installed
I/O modules. The Output data for Slot 0 is received first, followed
by the Output data for Slot 1, and so on up to slot 7.
The first word of input data sent by the adapter is the Adapter Status
Word. This is followed by the input data from each slot, in the order
of the installed I/O modules. The Input data from Slot 0 is first after
the status word, followed by Input data from Slot 2, and so on up to
slot 7.
Adapter Status
Slot 0 Input Data
Slot 1 Input Data
Slot 7 Input Data
Slot 0 Output Data
Slot 1 Output Data
Slot 7 Output Data
Read Data
Write Data
Network READ
Network WRITE
DeviceNet Adapter
Slot 0
I/O Module
Read
Write Slot 1
I/O Module
Slot 7
I/O Module
...
... ...
... ...
I/O Structure

2–3 How Communication Takes Place and I/O Image Table Mapping
Publication 17946.5.5 - October 1996
Adapter Input Status Word
The input status word consists of:
•I/O module fault bits – 1 status bit for each slot
•node address changed – 1 bit
•I/O status – 1 bit
15Bit: 01234567810 through 15
I/O Module Fault Bits
Node Address Changed Bit
Slot 0 Slot 1 Slot 2 Slot 3 Slot 4 Slot 5 Slot 6 Slot 7
9
I/O State Bit
Not Used
The adapter input status word bit descriptions are shown in the
following table.
Bit Description Bit Explanation
0This bit is set (1) when an error is detected in slot position 0.
1 This bit is set (1) when an error is detected in slot position 1.
2 This bit is set (1) when an error is detected in slot position 2.
I/O Module Fault
3 This bit is set (1) when an error is detected in slot position 3.
I/O Module Fault 4This bit is set (1) when an error is detected in slot position 4.
5 This bit is set (1) when an error is detected in slot position 5.
6 This bit is set (1) when an error is detected in slot position 6.
7 This bit is set (1) when an error is detected in slot position 7.
Node Address Changed 8 This bit is set (1) when the node address switch setting has been
changed since power up.
I/O State 9 Bit = 0 - idle
Bit = 1 - run
10 thru 15 Not used - sent as zeroes.
Possible causes for an I/O Module Fault are:
•transmission errors on the Flex I/O backplane
•a failed module
•a module removed from its terminal base
•incorrect module inserted in a slot position
•the slot is empty
The node address changed bit is set when the node address switch
setting has been changed since power up. The new node address does
not take affect until the adapter has been powered down and then
powered back up.