The Apollo Marine DIN-Rail 5500-774MAR is a Input/Output unit that provides a voltage-free, single pole, changeover relay output, a single monitored switch input and an unmonitored non-polarised opto-coupled input.
The Apollo 55000-774MAR supervises one or more normally-open switches that are connected to a single pair of cables. The 55000-774MAR is set to return an analogue value of 4 in the event of an open or short-circuit fault and 16 during normal operation. The status of the inputs is reported by means of two input bits. The changeover contact is operated by a software command from the panel.