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INVENSYS TRICONEX 3511 INPUT MODEL PULSE CIRCUIT BOARD

ANSI/ISA S84.01-1996 is the United States standard for safety systems in the process industry. The SIL classes from IEC 61508 are used and the DIN V 19250 relationships are maintained. ANSI/ISA S84.01-1996 does not include the highest SIL class, SIL 4. The S84 Committee determined that SIL 4 is applicable for medical and transit systems in which the only layer of protection is the safety-instrumented layer. In contrast, the process industry can integrate many layers of protection in the process design. The overall risk reduction from these layers of protection is equal to or greater than that of other industries.

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