Rockwell Automation 1756-DH485 ControlLogix DH-485 Communication Module User Manual - Manual (Page 34)

Publication 1756-UM532A-EN-P - May 2006
3-2 Use Data Highway 485 Network
Link Design
When you design your DH-485 link, you should use good design practices,
including laying out the link before installation. We also recommend you
consider the following when designing your DH-485 link:
• All performance requirements
• Maintenance
• Possible future changes to the link
Use a Belden 9842 or a Belden 3106A cable to connect your module to
DH-485. Only connect a DH-485 network using a daisy-chain configuration.
If you need to know how to install a DH-485 network, refer to publication
1747-UM011, SLC 500 Modular Hardware Style User Manual.
Two Methods of
Communication Over a
DH-485 Network The 1756-DH485 module acts as a bridge for two methods of communication.
These methods are:
• DH-485 Messaging
• Common Industrial Protocol (CIP) Messaging
The table Types of Communication on the 1756-DH485 Module lists the
devices that support each communication method.
Types of Communication on the 1756-DH485 Module
Type of Communication Devices and Software Support
DH-485 messaging SLC-500 -5/05, 5/04, 5/03, 5/02, 5/01, MicroLogix
Logix controllers
RSLinx and RSLogix 500 software
Common Industrial Protocol
(CIP) messaging Logix controllers
RSLogix 5000 and RSLinx software