MTL830 Series multiplexers with Modbus® outputs provide a cost-effective alternative to single-loop isolation. The cost of installed wiring is reduced by up to 50% by communicating the input of multiple hazardous-area sensors over dual-redundant data highways. Further savings are achieved by reducing the number of inputs to the host, cabinet space and weight.
A multiplexer transmitter, mounted in the hazardous area, caters for thermocouple, RTD and mV analogue inputs. A compatible safe-area receiver provides serial Modbus® outputs for feeding to host PLC, PC or DCS controllers.
Dual-redundant data highways between the transmitter and the receiver allow continuous normal operation with only one highway connected. The highway cable, a simple twisted pair or a pair of wires within an IS multi-core cable, carries both power and data, over distances up to 2km. If the multiplexer transmitter is located in the hazardous area, each data highway must be protected by an MTL3052 digital isolator