Crossloads, Synchronization, and Switchovers for Standard Tasks
IMPORTANT:
The safety task in Logix SIS uses concurrent execution on both controllers and does not operate the same as standard tasks.
However, like standard tasks, the safety task executes slower in a redundant chassis pair due to cross-compare diagnostics.
Synchronization points are points where the primary controller transfers, or crossloads, data to the secondary controller. This process enables the secondary controller to assume control if a switchover is required. Before you program your redundant controller, understand how this process impacts the execution of a task or program after a switchover.
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