NOTE -THIS CLAUSE IS PART OF THIS STANDARD AND CONTAINS MANDATORY REQUIREMENTS. This standard addresses Electrical/Electronic/Programmable Electronic System (E/E/PES)@ associated sensors@ final elements@ and interfaces used in automated Safety Instrumented Systems (SIS) for the process industries (Reference C.6). Examples of the E/E/PES technologies are a) electromechanical relays; b) solid state logic; c) PES; d) motor-driven timers; e) solid state relays and timers; f) hard-wired logic; and g) combinations of the above. Boundaries of the Safety Instrumented System (SIS) The SIS includes all elements from the sensor to the final element@ including inputs@ outputs@ power supply@ and logic solvers. SIS user interface may be in the SIS. Other interfaces to the SIS are considered a part of the SIS if they have potential impact on its safety function.
ISA S84.01-1996 history
1996ISA S84.01-1996 Application of Safety Instrumented Systems for the Process Industries.