Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module - Manual (Page 57)

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 57
Using Programming Software in DH+ Applications Chapter 4
RSLogix 500 DH+ Application Example
The following figure shows an example DH+ application that includes SLC-5
processors using the 1756-DHRIO and 1756-DHRIOXT modules to write
message instructions.
ControlLogix Chassis
1756-DHRIO
SLC 5/04 controller A
Node Number: 015
DH+ Link
Link ID 1
SLC 5/04 controller B
Node Number: 025
19765
1756-DHRIO
DH+ Link
Link ID 2
Channel B
Node Number: 020
Channel B
Node Number: 030