Rockwell Automation 1747-SCNR ControlNet Scanner Module Reference Manual - Manual (Page 36)

Publication 1747-RM623D-EN-P - June 2006
4-2 Work with the ControlNet Explicit Message Instruction
The CEM instruction uses an integer control block for storing the
instruction parameters and a configuration setup screen, similar to the
MSG instruction. The CIP commands consist of a Service Code; the
object Class, Instance, and Attribute; and Send and Receive Data (if
required for the selected Service Code). The setup screen provides a
list of standard CIP Services to select from, including:
• Read Assembly.
• Write Assembly.
• Read Parameter.
• Write Parameter.
• Generic Get Attribute Single.
• Generic Set Attribute Single.
In addition, a Custom setting lets you enter any Service Code. Send
data and receive data are stored in separate data table files.
Work with ControlNet
Explicit Message (CEM) This is an output instruction that lets you initiate unconnected CIP
Generic messages via a 1747-SCNR ControlNet scanner installed in the
local chassis.
These messages can be initiated to any nodes on the same ControlNet
network as the 1747-SCNR module, regardless of whether the
destination node is in the scanner’s scan list or not, and regardless of
whether the scanner is in Run mode or Idle mode.
Each scanner can process only one CEM instruction at a time. The
instruction is similar in operation to a standard MSG instruction.
Output Instruction
Fixed SLC
5/01
SLC
5/02 SLC
5/03 SLC
5/04 SLC
5/05
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