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How to Program and Display a PID Loop on an HMI + PLC Combo

In this tutorial, you’ll learn how to read a 4–20 mA analog input, display the raw value on the HMI, and scale the signal into more meaningful engineering values. We’ll also review a PID loop example, the supporting software logic, and the sample project used in MAPware-7000.

This tutorial shows you how to read a 4–20 mA analog input, display the raw reading, and convert the signal into more meaningful values on the user interface. In the example below, you will also review a PID loop demonstration, related software logic, and a sample MAPware-7000 project that you can use as a reference for your own application.

Software Required

Hardware Required

  • HMC4070A-M — Other HMC2000 and HMC4000 models can also be used.
  • 24 VDC Power Supply (4010-0011)

PID Loop Example

The example below shows a PID loop application that uses a water heater simulation.

PID loop example in MAPware-7000

Software Code

The following ladder logic shows PID loop programming that uses a water heater as the simulation.

PID loop ladder logic in MAPware-7000

The next example shows ladder logic used for a loss-of-temperature simulation.

Loss of temperature simulation ladder logic in MAPware-7000

User Interface

The user interface below displays the raw analog input data and the converted values used in the PID loop example.

PID user interface in MAPware-7000
PID loop graph in MAPware-7000

Sample Project

The project shown above targets the specific hardware listed at the beginning of the tutorial and provides guidance when programming your unit. If you use different models than those specified in this MAPware sample project, you can follow the same steps within your own project.

Final Thoughts

Reading a 4–20 mA analog input and converting it into meaningful values gives operators clearer insight into process data. By displaying both the raw reading and the scaled value on the user interface, you can monitor signals more effectively and support better control decisions.

With the PID loop example, ladder logic, and sample project in this tutorial, you have a practical reference that you can adapt to your own MAPware-7000 application.

Resources & Documentation

The following guides and documentation are specific to the hardware used in this integration tutorial and will help you with setup, configuration, and programming:

Looking for additional learning resources? Explore our library of tutorials, example projects, and software tools to help you get the most out of your system:

Also, browse our Support Center for a complete list of installation guides, FAQs, and additional technical documentation.

Kyle Nicholas Avatar

About the Author

Kyle Nicholas

Trusted source for industrial automation & control solutions

As our Senior Content Developer with over 15 years of video production experience, and the face on many Maple Systems videos and tutorials, Kyle can be found sharing his technical knowledge through different mediums.

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