PLC Programming Debugging: Breakpoints in CODESYS

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⌚Timestamps:
00:00 - Intro
02:00 - Adding a Breakpoint
03:02 - Breakpoints in action
04:39 - Wrap-Up

Hello and welcome back to another free video from RealPars, the world's largest online learning platform for cutting-edge industrial technologies.

In today’s video, we are going to learn about Breakpoints in CODESYS.

Breakpoints are a powerful but underutilized tool for debugging PLC programs. In this video, we will show you how you can use breakpoints in CODESYS to debug difficult problems.

This video covers the process of debugging an existing CODESYS application.

In programming, a breakpoint is a defined point in a program where the code will halt execution.

In CODESYS, a breakpoint can be set on any box, rung, or line of code in a project.

When the breakpoint is activated, the application is halted. This gives you the chance to inspect the value of variables and the call stack at a particular moment of application execution.

After a breakpoint has been activated, you can resume the execution of your application as normal or you can single step through the application to continue debugging.

Throughout this video, we will show you how to work with breakpoints using an example CODESYS project. In this project, we scale an analog input to a temperature in degrees Celsius and then convert that value to a temperature in Fahrenheit.

We’ll start by adding a breakpoint to the first Network in the program.

After we have installed a breakpoint, we run our application and see how it behaves.

When we start running the application, the breakpoint is immediately activated and execution is halted.

A key part of our demonstration involves modifying variable values and executing rungs to observe the changes.

Single-stepping through the application makes it easy to spot where the application’s logic is not working as expected and correct it.

Finally, after implementing the necessary changes, we run through the application again to ensure the corrections are effective, demonstrating the power of breakpoints in debugging PLC programs.

Do you use breakpoints in your CODESYS applications? Let us know in the comments what you use them for.

@Codesys-AutomationSoftware

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If you want to learn more about developing applications with CODESYS, then I suggest you check out our course, “CODESYS 1: Introduction to PLC Programming” which explains how to write and test your first PLC program with CODESYS:
https://www.realpars.com/courses/codesys-1-introduction-to-plc-programming

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