UFC760BE43 3BHE004573R0043 DCS / PLC system module ABB Control

UFC760BE43 3BHE004573R0043 DCS / PLC system module ABB Control

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• The functional relationship between process inputs and outputs, including

logic, mathematical functions and any required permissive.

• Requirements for manual shutdown when applicable.

• Requirements related to energize or de-energize to trip.

• Requirements for resetting the SIS after shutdown.

• The maximum spurious trip rate shall be specified.

• Failure modes and desired response of the Safety Instrumented System.

• Any specific requirements related to starting up and restarting the SIS.

• All interfaces between the SIS and any other system as well as operators.

• The modes of operation of the plant and identification of the safety

instrumented functions required to operate within each mode.

• The application software safety requirements as listed in Application Safety

Requirement Specification on page 75.

• Requirements for overrides, inhibits and bypasses.

• Any action necessary to achieve or maintain a safe state in the event of fault(s)

being detected in the SIS, taking account for all relevant human factors.

• The mean time to repair that is feasible for the SIS.

• Potential dangerous combinations of output states of the SIS.

• The extremes of all environmental conditions likely to be encountered by the

SIS.

• Normal and Abnormal modes of Plant operation.

• Requirements for any SIF necessary to survive a major accident event.