32 In Out Relays Interface 8Rx4 is a modular relays interface; convert 'open-collector' or 'close-to-ground' outputs to 'clean contact' outputs (with 'normally open' and 'normally-closed' contacts) for a galvanic isolation between zones. From 1 up to 4 modules of 8 inputs in Rack 1U as followings: redundancy PSU 230Vac, switch-able on operation (N.02 PSU 230VAC-5VDC 15÷18VA) N.2 PSU status leds N.8 'close-to-ground' inputs on DB9 female N.8 NO and NC 'clean contacts' 2A-30VDC...