Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 31)

Publication 1747-RM623D-EN-P - June 2006
Prepare to Use the ControlNet Scanner 2-11
CIP Client Request Transfer
The scanner provides some limited CIP client messaging capability.
Using ladder programming, you can manually build a message request
for up to approximately 240 words of in and approximately 240 words
of out data, to let configuration and other limited messaging to remote
devices.
The CIP client message management is detailed in CIP Client
Management.
SLC 5/03, 5/04, and 5/05 processors at OS firmware level, series C,
FRN 10, or later, include ControlNet explicit message (CEM)
instruction capability. The CEM instruction uses the CIP client message
capability of the scanner. See Work with the ControlNet Explicit
Message Instruction section for details.