Safety instrumented system and ProSafe diagnostic functions

摘要

In April 1997, Yokogawa extended its business to the safety domain with FTS concept. ProSafe series, developed by Yokogawa Industrial Safety Systems B.V., have a certain function intended to stop a process to the safety side as '1Safety Instrumented System: SIS". SIS's "Safety function" is defined in DIN V 19250 and brand-new IEC61508 as well. IEC61508 classifies safety functionality to four levels of "SIL: Safety Integrity Level". It is not allowed to build a safety system by relays or DCS considered with SIL as a safety system. ProSafe-DSP SLS is certified as the most safety system because of its "inherent fail-safe" functionality. This function is realized by its unique technology called as "Magnetic Core Logic" or "SLS Pulse Logic". "SLS Pulse" circuit is totally self-checking and does not need any additional diagnostic circuit or test function. ProSafe-PLC has a high performance of availability as well as safety with loo2D configuration. Because ProSafe-PLC eliminates any common parts and does a dynamic and exhaustive diagnostics.