106 Rockwell Automation Publication 1756-UM001M-EN-P - February 2012
Chapter 5 Communication Networks
HART Communication
HART (Highway Addressable Remote Transducer) is an open protocol designed
for process control instrumentation.
The HART protocol combines digital signals with analog signals to ready the
digital signal for the Process Variable (PV). The HART protocol also provides
diagnostic data from the transmitter.
Figure 12 - HART Protocol Example
For more information about using the HART I/O modules, see the
ControlLogix HART Analog I/O Modules User Manual, publication
1756-UM533
.
For more information about the ProSoft HART interface, see the
ProSoftTechnologies
website at http://www.prosoft-technology.com.
Device Is used to
1756 Analog I/O modules
• 1756-IF8H
• 1756-OF8H
• Act as HART master to allow communication with HART field devices.
• Interface directly with field devices (through built-in HART modems),
eliminating need for external hardware and additional wiring.
• Provide access to more field device data, including voltage and current
measurements.
• Directly connect asset management software to HART devices.
• Support differential wiring for environments where improved noise immunity is
needed (input modules).
ProSoft interface
• MVI56-HART
• Acquire data or control application with slow update requirements, such as a
tank farm.
• Does not require external hardware to access HART signal.
• Does not provide a direct connection to asset management software.
ControlLogix Controller with
1756-IF8H or 1756-OF8H
Modules
HART Field Devices
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