A variety of on-off-auto relay modules are available from various suppliers (including Emphatec) but the SIGNEXT module allows the user to use any relay or contactor and has the unique feature of providing digital outputs that tell the host PLC or DCS the status of the relay i.e. whether it is under system control or being operated manually. The module is compact, DIN rail mounted and CULUS Listed. (picture On-Off_Switch –Module)
