What are the management of change requirements for SIS modifications?

SIS Management of Change (MOC): all SIS changes require formal assessment regardless of size, evaluate impact on SIL (does change affect PFDavg, response time, or systematic integrity), update SRS and other lifecycle documentation, verify modified system meets requirements (revalidation), update drawings, configuration, and maintenance procedures, train affected personnel, and maintain change records for audit trail. Changes requiring assessment: setpoint changes, logic modifications, hardware replacements with different components, proof test interval changes, and bypass procedure changes. Use pre-defined change categories with appropriate review levels. Minor changes may follow simplified process; significant changes require full lifecycle review.