Why are Alarm Annunciators separate devices?

The purpose of an alarm annunciator is to provide a reliable indication to the operator of the state of critical aspects of the process under any failure condition. Alarm Annunciators need to be relied upon to always alert the operator when any abnormal condition occurs that can affect safety, including the failure of the control system. The alarm annunciator is considered an additional and independent "layer of protection", and is vital when considering the overall safety of the plant

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