Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module - Manual (Page 69)

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 69
Messaging Between PLC-5 and SLC 5/04 Controllers Chapter 5
Configure Message Instructions
Use RSLogix 5 to configure the remote PLC-5 message instructions being sent to
ControlLogix controller B. The following figure shows message instruction for
this example.