Rockwell Automation 1756-DH485 ControlLogix DH-485 Communication Module User Manual - Manual (Page 38)

Publication 1756-UM532A-EN-P - May 2006
3-6 Use Data Highway 485 Network
This figure shows an example of remote DH-485 messaging between SLC/03
(or later) controller A and SLC 5/03 (or later) controller B. In this example, the
following information must be included in the remote DH-485 message
routing message instruction:
• Local DH-485 node = 020
• Destination link ID = 2
• Remote DH-485 node = 030
Remote DH-485 Messaging Between
SLC 5/03 Controller A and SLC 5/03 Controller B
Link IDs
To use remote DH-485 messaging, each network that is an originating network
or target network must have a unique link ID. The 1756-DH485 module
requires these link IDs to be decimal values between 1-199. Each DH-485
channel on a 1756-DH485 module must have its own unique link ID.
TE RM T T A A A A B B
ControlLogix Chassis
SLC 5/03 Controller A
Link ID 1
SLC 5/03 Controller B
Link ID 2
Channel A - Node: 020
Channel B - Node: 025
1756-DH485 Module
44053
AIC+
AIC
AIC+
AIC
Node: 030