Which of the following is the backup system in the control architecture?

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Multiple Choice

Which of the following is the backup system in the control architecture?

Explanation:
In a control system, the backup path is the redundant channel that takes over if the main control path fails, keeping the plant operating safely. RS-4 is designated as this backup route, so it provides the alternate, failover capability that steps in automatically when the primary control path encounters a fault. The other designations in the same architecture typically serve different roles—primary control, monitoring, or interlock/auxiliary functions—so they aren’t the designated failover path.

In a control system, the backup path is the redundant channel that takes over if the main control path fails, keeping the plant operating safely. RS-4 is designated as this backup route, so it provides the alternate, failover capability that steps in automatically when the primary control path encounters a fault. The other designations in the same architecture typically serve different roles—primary control, monitoring, or interlock/auxiliary functions—so they aren’t the designated failover path.

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