Allen-Bradley Micro800

Communication instructions Chapter 9
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 201
MSG_MODBUS message triggering
A Modbus message can be triggered periodically by setting a non-zero value to the
TriggerType parameter. The following table describes what happens when the
TriggerType parameter is used with the MSG_MODBUS function block.
Action Results
Message is enabled Trigger timer starts
Trigger timer expires before the message
completes
Message is immediately triggered in the next ladder
scan cycle.
Message completes before the trigger time
expires
Message is triggered when the trigger time expires.
Example: message triggering
In the following example, the TriggerType value is set to 100.