In this note, we are going to know about a topic called “What is HART Communication Protocol?“, and About its architecture, and applications etc. Welcome to Poly Notes Hub, a leading destination for engineering notes for diploma and degree engineering students.
Author Name: Arun Paul.
What is HART Communication Protocol?
The HART (Highway Addressable Remote Transducer) communication protocol is a hybrid analog/digital communication protocol commonly used in industrial automation and process control systems. It enables digital communication using classic 4-20 mA analog wiring, making it compatible with older systems while also introducing new features.
HART Communication Protocol Specifications
- It sends digital signals superimposed on the usual 4-20 mA analog signal.
- HART allows you to read and write configurations to field equipment such as transmitters, valves, and sensors.
- It’s “Multidrop mode” allows you to connect up to 15 devices to a single pair of wires.
- It provides access to device diagnostics, calibration data, and settings without disrupting operations.
- Many instrument manufacturers provide widespread support.
Architecture or Block Diagram of HART Communication Protocol
Explanation of the above Block Diagram –
- Control System (PLC, DCS, or Host PC): This system handles process control and communicates with field devices.
- HART Modem or Interface: Converts digital data to FSK (Frequency Shift Keying), and vice versa. It could be built into the host or external.
- Field Instrument (Transmitter/Actuator): A smart device that can provide both analog signals (pressure, temperature) and digital data (device status, diagnostics).
- Sensor/Transducer: Measures the real physical parameter and transfers it to the field instrument.
Application of HART Communication Protocol
Here we have listed some HART Communication Protocol Applications –
- Field Device Configuration & Calibration
- Device Diagnostics & Troubleshooting
- Multivariable Communication
- Asset Management Systems (AMS)
- Remote Monitoring & Control