For emergency stop, switch, sensing mat/edges or safety light curtain monitoring. Safety modules XPSAK meet the requirements of Performance Level PL e/Category 4 conforming to standard EN/ISO 13849-1. They are used to monitor Emergency Stop circuits conforming to standards EN/ISO 13850 and EN/IEC 60204-1; for electrical monitoring of switches activated by protection devices, with optional selection of synchronisation time between signals; for monitoring 4-wire sensing mats or edges; to monitor type 4 light curtains conforming to EN/IEC 61496-1 that have solid-state safety outputs with test function (light curtains XUSL).These XPSAK modules incorporate 3 N/O safety outputs, a relay output and 4 solid-state outputs for PLC signalling and 4 LEDs to provide information on the monitoring circuit status. The Start button monitoring function is configurable depending on the wiring.