Safety control unit SB4-OR-4CP-4C Evaluation device for safety thru-beam sensors SLA12 and SLA29 and for 2 channel safety devices (emergency off) 8 sensor channels Self-monitoring (type 4 according to IEC/EN 61496-1) Operating mode can be selected by means of DIP switches Start/Restart disable Relay monitor Pre-fault indication Clearly visible LED functional display 7-segment diagnostic display Safety outputs OSSD, external status displays OSSD