microNCS Modbus remote terminal unit

The microNCS Modbus remote terminal unit (RTU) master and distributed input/output (I/O) system sends process signals between the field or factory floor and a control system. One or both Modbus RTU ports can be configured to poll other Modbus RTU slaves with all of the network polling functions of a typical Modbus master. This includes polling of up to 32 (without repeaters) microNCS stations. The unit can handle up to 64 slave devices when both Modbus RTU ports are in use. It concentrates data from four or eight fully isolated analog inputs and four discrete (contact closure) inputs, and then transmits the data long distances back to one or more host distributed control system (DCS), programmable logic controller (PLC) or personal computer (PC)-based control systems. Its industry-standard open connectivity (OPC) interface delivers plug-and-play integration with popular PC-based human-machine interface (HMI) and supervisory control and data acquisition (SCADA) software packages.