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

1 Publication 1756-UM532A-EN-P - May 2006
Chapter
3
Use Data Highway 485 Network
Introduction
This chapter describes the basics of the Data Highway 485 system and the
operation of a DH-485 network.
What Is Data Highway 485?
On the most basic level, Data Highway 485 is a wire or cable and a protocol
that connects computers and peripheral devices so that they can communicate.
The wire used for a network is called the network medium.
A DH-485 link transfers data between ControlLogix controllers, SLC
controllers, and other devices that use the DH-485 network. These devices are
called stations. You can connect a maximum of 32 stations to a single DH-485
link.
For See
What Is Data Highway 485? 3-1
Two Methods of Communication Over a DH-485 Network 3-2
Use DH-485 Messaging 3-3
Configuration Information in DH-485 Messaging 3-11
Application Timeout 3-12
Example DH-485 Network Routing Configuration 3-13
Use the Common Industrial Protocol (CIP) Messaging 3-14