Author Archives: Scott Baker

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It’s 2am on Sunday Morning – Can You Troubleshoot your PLC Code?

Tips on writing supportable PLC code


I’m writing this blog article on behalf of the maintenance technicians and control engineers who get called in the middle of the night to figure out why the line won’t run. They didn’t write the code. They have had no need to study it closely. Now the line is down, people are standing around, the Plant Manager is getting impatient, and they need to figure out what’s wrong. Here are some tips on how we can help them out when we are creating the PLC code:
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Just because you can, doesn’t mean you should

Things have changed a lot since I started in this business. In the “old days”, you could use any color combination you wanted on your HMI screen, as long as it was amber on a black background. You could use timers and counters in your ladder logic, as long as they were structured exactly right, and outputs always went at the end of the rung. Always.
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