Rockwell Automation 1756-DHRIO_DHRIOXT ControlLogix Data Highway Plus-Remote I/O Communication Interface Module - Manual (Page 81)

Rockwell Automation Publication 1756-UM514C-EN-P - June 2014 81
Messaging Between PLC-5 or SLC 5/04 Controllers and ControlLogix Controllers Chapter 6
Configure the Module Switches
In this example, Channel A on the 1756-DHRIO and 1756-DHRIOXT
modules must be set for DH+.
Configure a Controller Slot for the 1756-DHRIO Module
In this example, the controller is not in the default slot (slot 0) of the
ControlLogix chassis. You must use RSLinx software to configure a controller
slot for the 1756-DHRIO and 1756-DHRIOXT modules as shown in the
following figure.
IMPORTANT Controller slot values for the other channel, if it is configured for DH+, are
applied or restored to default values. In this example, controller values
applied to the channel not used for DH+ messaging do not matter, but
failure to enter a value generates a configuration fault for that channel.