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- 6.6 Benefits of HART Communication
- Cost saving in maintenance
| Multidrop Mode The multidrop mode of operation requires only a single pair of wires and, if applicable, safety barriers and an auxiliary power supply for up to 15 field devices. All process values are transmitted digitally. In multidrop mode, all field device polling addresses are >0, and the current through each device is fixed to a minimum value (typically 4 mA). 110 Field Instrumentation GEN Rev) 6.6 Benefits of HART Communication The HART protocol extends system capabilities for two-way digital communication with smart field instruments. More instruments are available with the HART protocol than any other digital communications technology. Almost any process application can be addressed by one of the products offered by HART instrument suppliers. Benefits of HART communicator are Improved plant operations Operational flexibility Instrumentation investment protection Digital communication 111 Field Instrumentation GEN Rev) Cost saving in maintenance The diagnostic capabilities of HART-communicating field devices can eliminate substantial costs by reducing downtime. The HART protocol communicates diagnostic information to the control room, which minimizes the time required to identify the source of any problem and take corrective action. Trips into the field or hazardous areas are eliminated or reduced. When a replacement device is put into service, HART communication allows the correct operational parameters and settings to be quickly and accurately uploaded into the device from a central database. Efficient and rapid uploading reduces the time that the device is out of service. Software applications provide a historical record of configuration and operational status for each instrument. This information can be used for predictive, preventive, and proactive maintenance. HART field controllers can also be wired in a multidrop network. Each analog output signal from the transmitter/controllers is isolated from every other output signal, which provides a cost-effective HART network configuration. Connecting HART field devices in a multidrop network can provide significant installation savings. The total cable length in a multidrop network is typically less than the maximum cable length in point-to-point connections because the capacitance of the additional devices reduces the distance that the HART signal can be carried. |