Signals & Analog
HART
Highway Addressable Remote Transducer
Definition
A digital protocol superimposed on a 4-20 mA loop, carrying device configuration, diagnostics, and secondary variables without disturbing the analog value.
Because the digital signal averages to zero current, a HART transmitter delivers a conventional analog reading to the PLC and a digital channel to a handheld communicator at the same time.
It needs a minimum loop resistance, typically around 230 ohms, which the standard 250 ohm input satisfies.
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