Everything You Need to Know About HART Communication Protocol

Today, HART protocol has become an industry standard for industrial automation. The pressure transmitters are configured to HART communicator for achieving desired performance. This post analyzes HART protocol, its working, benefits, and everything else you want to know about it.

1. Everything You Need to Know About HART Communication Protocol By The Transmitter Shop Inc.

2. Overview of HART Communication Protocol In Industrial Automation systems various types of Smart Field Devices are used. These smart devices help in monitoring every device installed in the factory. These devices also enable transmission of data between connected devices, both inside and outside of the factory. This data is used to streamline factory automation and process control. The data communication was accomplished through 4-20 mA loop transmitters. The only drawback of this system is that it can only monitor one process variable at any time. This is where HART-enabled smart devices such as  HART transmitters  can make a difference. Today, HART protocol has become an industry standard for industrial automation.

3. What is HART Technology? HART or Highway Addressable Remote Transducer was first introduced in 1980s. The HART Protocol facilitates digital data or signal transfer over analog wiring systems. More than 300 million devices across the world are powered by HART protocol HART protocol has become an industry standard for establishing communication between host systems and smart field devices.  the HART technology is a bi-directional communication protocol.

4. Working Principle of HART Communication Protocol HART Technology is built on 202 Standards and works on frequent shift keying (FSK) principle. It is made of 2 Frequencies – 12oo Hz and 2200 Hz The 1,200 Hz signal represents bit 1 and the 2,200 Hz signal represents bit 0.  The HART protocol supports two communication channels at a time –4-20 mA analog signal and digital signals. The digital signals can be any information such as the operational status of the device, diagnostics, any measured value, and so on.

5. Modes of HART Communication Protocol Point-to-Point – In this type of configuration, the traditional signal is used to define one variable, while the other important process variables are communicated through digital signals over HART Protocol. Multidrop – In this type only one slave device is used to broadcast a HART reply message. It uses only a pair of wires.

6. Benefits of Using HART Protocol for Industrial Automation Optimizes operational capabilities of device data It identifies the potential problems before they occur and minimizes the downtime due to equipment failure. Reduces device maintenance and inventory costs. Reduces wait times problem identification and resolution. Improves Safety Integrity Levels through advanced diagnostics. Automates record keeping.

7. Conclusion Due to its increasing popularity, the protocol has been updated several times since the introduction. HART-enabled transmitters, especially HART pressure transmitters are widely used in various process industries for pressure measurement. The pressure transmitters are configured to HART communicator for achieving desired performance. Rosemount and Foxboro are two prominent brands offering HART pressure transmitters.

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