Common industrial network protocol – HART

The Highway Addressable Remote Transducer (HART) protocol is the world standard protocol and provides data exchange between smart/intelligent field devices and a controller (PLC, DCS, and so on) or handheld communicator. You can control and monitor HART-enabled field devices (sensors, transmitters, and actuators) with the HART protocol. In HART communication, a digital signal is superimposed on the traditional 4-20mA analog signal, allowing the 4-20mA analog signal to co-exist with the digital signal on the same two-wire loop without distortion. Hence, two signals are transmitted simultaneously – that is, the 4-20mA signal and the digital signal. The 4-20mA analog signal represents the measured variable regarding the temperature, pressure, level, or flow while the digital signals carry other device details, such as the device’s health, status, diagnostics alerts, and more.

Each sensor/transmitter and actuator (transducer...