Ten years ago, when I first joined an automotive parts factory as an automation engineer, I faced a suddenly halted production line. The factory manager anxiously asked, “Why does the equipment respond so slowly after pressing the start button? Sometimes it doesn’t respond at all!” At that time, I couldn’t explain it well, but later … Read more
Hello everyone, I received a submission from a fan who mentioned seeing the RETURN instruction used in someone else’s program and asked me to explain its usage. As the name suggests, RETURN means to return. In a program, it is used to control the execution flow, returning to the point of the higher-level call. When … Read more
Recently, I’ve encountered several newcomers asking about the PLC scan cycle issues, it’s really frustrating! They keep making the same mistakes over and over again. After working in this field for over ten years, I’ve seen too many program crashes caused by a lack of understanding of the scan cycle principles. To put it bluntly, … Read more
Another newcomer is asking what a PLC is, how annoying! It’s already 2023, and there are still people who don’t know what a PLC is? This thing is the brain of the factory, without it, all the machines in the factory would stop working. Alright, since you are so sincere, let me explain it to … Read more