Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 35)

1 Publication 1747-RM623D-EN-P - June 2006
Chapter
4
Work with the ControlNet Explicit Message
Instruction
What This Chapter Contains The following table describes what this chapter contains.
Understand the ControlNet
Explicit Message (CEM)
Instruction The CEM instruction lets generic Common Industrial Protocol (CIP)
commands be initiated to devices, such as drives, communicating on
ControlNet networks. This instruction requires RSLogix 500 software,
version 7.10 or later, for programming.
The CEM instruction uses the explicit message capability built into the
1747-SCNR ControlNet scanner.
While not adding any additional capability over what already exists in
the scanner, the CEM instruction simplifies the programming,
configuration, monitoring, and troubleshooting of explicit messages
on the ControlNet network.
Unlike I/O configured in the scanner’s scan list, which is updated on a
continual basis, explicit messages let data be sent and received on an
as-needed basis, minimizing network traffic. For instance, you may
want to write configuration parameters to a drive once at machine
start-up time.
The CEM instruction can be used with any SLC 5/03, 5/04, or 5/05
processor that is at OS firmware level Series C, FRN 10, or later.
For Information About See Page
ControlNet Explicit Message (CEM) Instruction Overview 4-1
How to Work with the Explicit Message Instruction 4-2
How to Work with the CEM Instruction Parameters 4-2
How to Work with the CEM Instruction Setup Screen Paramter 4-3