What is Hart Network?
The Protocol HART (Highway Addressable Remote Transducer) enables two-way digital communication on intelligent field instruments, without interfering with the 4-20mA analog signal. The standard provides two simultaneous communication channels: an analog signal of 4-20mA and a digital signal.
Communication [Analog / Digital]
The primary variable and control signal information can be transmitted by 4-20mA, while additional measurements, process parameters, instrument configuration, calibration and diagnostic information are available in the same wiring at the same time.
The HART Protocol uses frequency shift so-keying (FSK) to overrun digital communication signals over 4-20mA.
Logic “1” is represented by a frequency of 1200Hz and the logic “0” is represented by a frequency of 2200Hz.
Features and benefits of the protocol
The protocol operates as the Master-Slave pattern, where the slave will only transmit a message if there is a request from the master, that is, the field instrument (slave) will only send information when it receives a request from the control system (master).
- Simple design, easy operation and maintenance;
- Compatibility with analog instrumentation (valve positioners);
- Fully open with several suppliers;
In version 7 of the protocol, the wireless model was implemented, wirelessHART which brought even more benefits to the industrial plants of today.
Observation
Every Hart device is accompanied by a Device Description (DD) file that describes all parameters and functions of the device;
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