Programming the CLEARSY Safety Platform
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The CLEARSY Safety Platform is a generic PLC able to perform command and control over inputs and outputs. For safety critical applications, the PLC has to be able to determine whether it is fully functional or not. In case of failure, the PLC should move to restrictive mode where all the outputs are deactivated. The stronger the risk of harming people in case of failure, the higher the Safety Integrity Level. For SIL3 and SIL4, the computations have to be performed by a minimum of two processors and checked with a voting system.