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Rockwell Automation Publication 1420-UM001D-EN-P - September 2013 37
Communication Chapter 4
We assume that you are familiar with basic message programming in a Logix
controller. Once you have set up the logic, message tag, destination tag, and
message instruction, follow these steps to configure the message. This example
uses a CompactLogix controller, revision 20.
1. Choose the appropriate parameters in the Message Configuration window.
Parameter Choice
Message Type Choose message type CIP Generic.
Service Type Read: Select service type Get Attribute Single (E hex)
Instance Refer to Appendix A
for the CIP Instance of the data table to read. In this example, the power
monitor's Real-time Metering Values (Voltage and Current) data table is instance 101 (decimal).
Class 4 hex
Attribute 3 hex
Destination Get Attribute Single - This is the first element of the controller tag that stores the data being
read. The tag is an array of the applicable data type the same length as the assembly instance; in
this example, 12 REAL elements.
Source Element Not applicable to a Read
Source Length Not applicable to a Read