Of Operation 2
hart-protocol
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- PC Application Development Tools
- Control in Field Devices
| Product Name
| |
|
Manufacturer | |
|
Commubox |
Endress + Hauser |
|
FSK-Modem |
EB Hartmann & Braun |
|
HT311 RS232 Interface |
Smar International |
|
VIATOR PCMCIA HART Interface |
MACTek |
|
VIATOR RS232 HART Interface |
MACTek |
Table 5: HART Interfaces
Figure 16: RS232 HART Interface
PC Application Development Tools
Software drivers are available to assist in the development and integration of PC applications with HART networks. Table 6 shows a partial list of products available.
|
Product Name |
Description |
Manufacturer |
|
Hview |
Provides DDE server |
Arcom Control Systems |
|
HRT VBX |
16-bit Visual Basic driver |
Borst Automation |
|
HRT OCX |
32-bit ActiveX Control |
Borst Automation |
|
HART OPC Server |
OPC Server |
HCF (via member companies) |
|
HL-LinkPro |
HART driver for LabVIEW |
Cardiac Systems Solutions |
Table 6: PC Development Tools
Control in Field Devices
Microprocessor-based smart instrumentation enables control algorithms to be calculated in the field devices, close to the process (Figure 17). Some HART transmitters and actuators support control functionality in the device, which eliminates the need for a separate controller and reduces hardware, installation, and start-up costs. Accurate, closed-loop control becomes possible in areas where it was not economically feasible before. While the control algorithm uses the analog signal, HART communication provides the means to monitor the loop and change control setpoint and parameters.
Figure 17: Transmitter with PID (HART Slave)
Placing control in the field enhances control functionality. Measurement accuracy is maintained because there is no need to transmit data to a separate controller. Control processing takes place at the high update rate of the sensor and provides enhanced dynamic performance.
Control in Field Devices
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