Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 128)

128 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013
Chapter 6 CGCM Unit Software Interface
Configuration Step 2
The Unscheduled Message tag permits gains and certain other configuration
parameters to be changed with excitation enabled. The user program must
include logic to write the Unscheduled Message tag whenever necessary.
When the ConfigRcvd bit is asserted and the UnschWrRcvd bit is unasserted,
the user program initiates a message instruction to transfer the Unscheduled
Message tag to the CGCM. The user program can also write this tag at any other
time that the ConfigRcvd bit is asserted, whether or not excitation is enabled.
The CGCM unit checks that all parameters in the Unscheduled Write message
are within range and if they are, it accepts the message and asserts the
UnschWrRcvd
bit.
When the UnschWrRcvd bit is asserted, the CGCM unit begins processing
Scheduled Write (Output) data and is ready for normal operation based on the
configuration received. The CGCM unit ignores any Scheduled Write (Output)
data if the UnschWrRcvd bit is not asserted.
Configuration Summary
These are the configuration changes to the CGCM unit.:
• The CGCM unit accepts only Configuration data when excitation is
disabled and all the configuration data is within range.
• The CGCM unit accepts Unscheduled Write data regardless of the
excitation state provided that all Unscheduled Write data is within range.