User Manual
Table Of Contents
- 1756-UM532A-EN-P
- Important User Information
- Table of Contents
- Purpose of This Manual
- Preface
- 1756-DH485 Module Overview
- Overview of the DH-485 Network
- Introduction
- DH-485 Network Description
- DH-485 Network Protocol
- DH-485 Token Rotation
- DH-485 Network Initialization
- Devices that Use the DH-485 Network
- 1747-AIC Isolated Link Coupler for DH-485
- 1761-NET-AIC Advanced Interface Converter Product Overview
- Operating Modes
- Device Compatibility
- Misconception about the 1761-NET-AIC Converter
- 1747-UIC USB to DH-485 Interface Converter
- Example System Configuration
- Important Planning Considerations
- Additional Resources
- Use Data Highway 485 Network
- Use RSLinx Software to Create a Routing Table
- Communicate from an SLC 5/03 Controller to a Logix Controller over a DH-485 Network
- Communicate Between SLC Controllers over DH+ and DH485 Networks
- Communicate Between a PLC-5 Controller and a Remote SLC 5/03 Controller over Multiple DH-485 Networks
- Communicate from an SLC 5/05 Controller to an SLC 5/03 Controller over an EtherNet/IP Network
- Communicate to a SLC 5/03 Controller on a DH-485 Network
- Communicate from a Logix Controller to an SLC 5/03 Controller over EtherNet/IP and DH-485 Networks
- Specifications
- Troubleshoot the 1756-DH485 Module
- Index
- How Are We Doing?
- Rockwell Automation Support
- Backcover

Publication 1756-UM532A-EN-P - May 2006
Use Data Highway 485 Network 3-7
The message originates on the source network. The destination network is the
message’s target network. This applies to all source and destination networks,
including DH-485, ControlNet, EtherNet/IP, and a ControlLogix chassis
backplane.
Routing Tables in Remote DH-485 Messaging
The 1756-DH485 module contains a routing table that you define for your
application. The routing table contains information used to steer Remote
DH-485 Messages through the system to remote nodes located on separate
networks. By using the routing table, the 1756-DH485 module lets existing
devices, such as an SLC controller, to use DH-485 Remote Addressing for
messaging.
You must use RSLinx software to configure your routing table. Refer to Use
RSLinx Software to Create a Routing Table on page 4-2, for more information.
IMPORTANT
For remote DH-485 messaging, the ControlLogix chassis
backplane should be considered a separate, independent
network. Therefore, a system of 1 DH-485 network and
one ControlLogix chassis is a two-link system.
The ControlLogix chassis backplane is required to be a
separate, independent link for DH-485 messaging if there
is more than one message target ControlLogix controller in
a ControlLogix chassis.