Publication 1756-UM523F-EN-P - December 2006
Design the System 41
Additional Design
Considerations
Keep these things in mind as you design your system.
Additional Design Considerations
Switchover always triggers an event
task in a remote, nonredundant
controller.
A switchover triggers an event task under this combination of circumstances:
• The event task is in a nonredundant controller. An event task is not permitted in a redundant
controller.
• A redundant controller triggers the event task via a produced tag.
This occurs regardless of how you configure the produced tag.
Simultaneous branch delays the
execution of a higher priority task.
Both configurations always trigger an
event task during a switchover.
In an SFC, each path of a simultaneous branch delays
the execution of a higher priority task by up to 25 μs.
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