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Safety Instrumented Systems (SIS) play a vital role in providing the protective layer functionality in many industrial process and automation systems. These systems may also be referred to as Emergency Shutdown Systems (ESD) or Process Shutdown Systems (PSD).
Today SIS Safety Instrumented Systems play an increasingly important role in many process plants. Safety standards such as IEC 61508, IEC 61511 and ISA S84.01 are creating more stringent safety requirements for process plants.
Depending on application use, other names used for SIS Safety Instrumented Systems are: Emergency Shutdown Systems (ESD), Burner Management Systems (BMS), Fire and Gas Systems (F&G), Critical Turbo machinery Control, Railway Switching, Semiconductor Life Safety Systems (SEMI S2), Nuclear 1E Safety Systems, High Integrity Protection Systems (HIPS), High Integrity Pressure Protection System (HIPPS).
Safety Methods employed to protect against or mitigate harm/damage to personnel, plant and the environment, and reduce risk include: