Remote terminal unit
Videos
A remote terminal unit is a microprocessor-controlled electronic device that interfaces objects in the physical world to a distributed control system or supervisory control and data acquisition system
Remote Terminal Unit Modular
Current loop
Videos
In electrical signalling an analog current loop is used where a device must be monitored or controlled remotely over a pair of conductors. Only one current level can be present at any time.
Control valve with pneumatic diaphragm actuator and "smart" 4–20 mA positioner which will also feed back the actual valve position and status over the current loop
