Allen-Bradley Micro800 General Instructions Manual page 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
Message is enabled
Trigger timer expires before the message
completes
Message completes before the trigger time
expires
Example: message triggering
In the following example, the TriggerType value is set to 100.
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Communication instructions
Results
Trigger timer starts
Message is immediately triggered in the next ladder
scan cycle.
Message is triggered when the trigger time expires.
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