HART stands for "highway addressable remote transducer", and is a protocol that is still heavily used in the process automation industry. HART is essential for the remote configuration, troubleshooting and maintenance of plant instrumentation and it's use yields many cost saving benefits.
HART stands for "highway addressable remote transducer", and is a protocol that is still heavily used in the process automation industry. HART is essential for the remote configuration, troubleshooting and maintenance of plant instrumentation and it's use yields many cost saving benefits.
This course has been designed with practicality in mind. At the end of this course, you will be able to use the HART protocol in a very hands-on way to configure, maintain and troubleshoot plant instrumentation. Essentially, you will have a new practical skill in the field of process automation and plant maintenance.
Specifically, in this course, you will learn:
- Where HART is used in the process automation industry.
- Basic technical overview.
- How to create a physical point-to-point HART network.
- HART commands and data frames.
- Software simulation of master/slave communication.
- Use of the popular PACTware software for HART communication.
- Advanced technical details / real world application examples.
and much more ...
The HART protocol is mainly applied to the management of instrumentation devices within a process plant.
The HART protocol is able to provide benefits in many different situations involving the management of the plant instrumentation devices. This lecture shows four such scenarios.
HART uses a master/slave method of network arbitration. Also there are two network topologies.
HART uses a method called Frequency Shift Keying (FSK) to represent logic 1 and 0.
A basic block diagram schematic showing the hardware and software set up we will be using throughout the section.
Shows a detailed schematic of the 4-20 mA connection as well as the physical connection on the workbench.
Using a RS232 to USB connection from the RTU to the laptop, an HMI project is setup and run to poll the 4-20 mA reading.
Three things are done in this section: (1) The HART modem is connected to the 4-20 mA loop, (2) The HART software is downloaded and installed, (3) The DD file for the temperature transmitter is downloaded.
The HART software is setup and run. It reads data from the transmitter while the HMI software continues to read the 4-20 mA PV value.
A look at the 3 categories of HART commands and their basic characteristics.
More detail on command codes as well as guidelines on how to read a HART command reference.
The various parts of the HART data frame and the purpose of each field.
Three examples showing the byte stream for master slave requests and responses.
The plan for the section is explained as well as the software tools are downloaded and installed.
The software tools are used to simulate various commands between a HART master and a slave device.
The master simulator is used to send commands to the temperature sensor and collect responses.
A basic overview is given of how PACTware works and then instructions are given for the downloading of the required software components.
How to perform the installation of the core PACTware software as well as the HART components.
Configuring the PACTware Software and Establishing HART Communications
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