When both transmitters are healthy, operator can select any transmitter or
average value for control (on Auto).When one transmitter fails, the control
shall changeover to the other healthy transmitter and the alarm (failure)
status to be notified to the operator. When both transmitters are faulty OR
there is a deviation between the two transmitter readings (beyond specified
margin), the control loop shall be forced to Manual and Failure to be alarmed
to operator including forced manual status.Force the controller to
Manual mode, if there is no redundancy
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