Yokogawa - Model ProSafe-SLS -Solid State Process Safety System (SIS)

The ProSafe-SLS is a Safety Instrumented System that was designed for applications, which require the highest Safety Integrity Levels (SIL 3 & 4). It employs solid-state elements to process the functional logic. This technology is capable of executing all typical Safety tasks, as well as the related supplementary Non-Safety-Critical functions. This comprises interfacing with a Human Machine Interface, Process Control System, Sequence of Event Recording system, SCADA system, etc. The sophisticated design and superior Safety performance have created the Safety reference standard for solid-state Safety Instrumented Systems. A radical Safety achievement, is the elimination of software for an operating system and for self-diagnostics. Instead, a unique inherent self-test technology is employed, throughout all Safety-related parts of the ProSafe-SLS system.

The modules that are used to build a system solution are a grouped in various categories as summarized below:

• Input modules
• Logic & Timer modules
• Output modules
• Power & Clock modules
• Auxiliary modules
• Communication & Interface modules

Interconnection wiring actually programs the application into the system.