Hart (Highway Addressable Remote Transmitter)

Hart (Highway Addressable Remote Transmitter)

1. Benefits

   • Leverage the capabilities of a full set of intelligent device data for operational improvements.
   • Improve regulatory compliance
   • Reduce Maintenance Costs
   • Increase Plant Availability

2. Drawbacks

   • A potential problem with trying to use conventional Master software in this telephone application is the delays in the telephone network

3. Relevant application areas

   • Intrinsically safe communication in hazardous areas

4. Operation priciple

   • HART employs Frequency-Shift Keying (FSK) technology to transmit field instrument data to an asset management system used to analyze and react to changing conditions of the device or process. The digital HART communication signal is produced using 1,200 and 2,200 Hz frequencies (corresponding to 1 and 0) and superimposed on the analog 4-20 mA control signal without interrupting or interfering with the analog signal.

5. Communication principle

   • HART technology is a master/slave protocol, which means that a smart field (slave) device only speaks when spoken to by a master. The HART Protocol can be used in various modes such as point-to-point or multidrop for communicating information to/from smart field instruments and central control or monitoring systems.

6. Data transfer speed

   • Baud rate 1200bits/second

7. Cable length

   • Max cable lengths: 3000m: cable’s cross sectional area: 0,5mm^2, capacitance: 65nF/km

8. Network components

9. Topologies

   • Multidrop
   • Point-to-point

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