UFC760BE43 3BHE004573R0043 DCS / PLC system module ABB Control

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.