Rockwell Automation Logix5000 Controllers Tasks, Programs, and Routines Programming Manual - Manual (Page 59)

Manage event tasks Chapter 2
Synchronize multiple controllers
You can also use the produced/consumed tag relationship to synchronize
controllers. In this case, the produced/consumed tag serves only as a triggering
mechanism.
Description
The first controller runs an action with which other controllers need to stay synchronized.
When the action is done, the controller runs an IOT instruction. The IOT instruction uses a produced tag as
its target.
When controller A receives the produced tag, it runs its event task.
When controller B receives the produced tag, it runs its event task.
Checklist for the producer controller
For This Make Sure You
1. Buffer of data If you want to send a complete image of data at one instance in time, then produce a copy of the data, as shown in the following
illustration.
Rockwell Automation Publication 1756-PM005-EN-P - October 2014 59