OCAHG 492838402 ABB Automatic card DCS / PLC system circuit board

OCAHG 492838402 ABB Automatic card DCS / PLC system circuit board

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In order to maintain the safety integrity level of the safety system during the

operation period, it is of vital importance that proper procedures for modifications

are established and implemented.

Such procedures shall secure that all modifications to the SIS are properly planned,

reviewed and approved prior to implementing the change.

The following list is intended as items to consider when establishing procedures for

modification during operation:

• Impact analysis to identify all influenced parts of the system

• Properly trained and qualified personnel

• Guidelines described in System Design and Engineering on page 59

• Guidelines described in Application Software on page 74

• Guidelines described in Modification Testing on page 115

• Will the modification be implemented while the process is running?

– Evaluate the need for temporary measures to maintain safety integrity

during the implementation.

– Evaluate the need for temporary measures to avoid process upsets during

the implementation.

• Procedure Program Download and Startup on page 117

If the system is configured as a combined BPCS and SIS, changes can be done to

the BPCS part without affecting the SIS.