Rockwell Automation 1756-DH485 ControlLogix DH-485 Communication Module User Manual - Manual (Page 50)

Publication 1756-UM532A-EN-P - May 2006
4-4 Use RSLinx Software to Create a Routing Table
5. Select the DH-485 Routing Table tab.
You must build the routing table based on the 1756-DH485 modules in
the ControlLogix chassis. Each link ID (for example: chassis backplane,
channels A and B of any 1756-DH485 module in the chassis) is initially
undefined.