How to learn PLC in practice - Huaqiang Electronic Network
Simulation using PLC software or learning tools can help you grasp basic programming concepts, but when it comes to more complex programs, it's often hard to get a real sense of how things work. Even with a real PLC in front of you, you might still feel lost. This is because real-world scenarios involve mechanical actions, unexpected events, and on-site conditions that are difficult to replicate in software. In a well-developed PLC program, one-third or more of the code is dedicated to handling abnormal situations—like alarms, faults, or system stops—as well as preventing errors from occurring. So, if you have the opportunity, try working on small electrical projects or support engineers in their tasks—even if it doesn't bring immediate financial returns. The main purpose of a PLC is to control machinery. Without understanding the actual machine, it’s impossible to write effective code. Start by learning the wiring of the PLC, the peripheral devices, how signals are transmitted, how the wiring connects to input points (X), and which output points (Y) are connected to specific devices. While learning, you may find the Y outputs easy to manage, but if the output is constantly active, the cylinder might not retract properly, leading to long testing times. Once you have a basic understanding, try doing some simple PLC programming yourself. You'll likely face many challenges along the way. Always stay in touch with the mechanical team to fully understand the process. Having a clear idea of the mechanics while programming makes the task much easier. If one approach doesn’t work, don’t hesitate to try another. Avoid overly complicated methods or trying to be too clever. When debugging on-site, flexibility is key. Everyone is watching, so focus on the fastest solution to the problem. After returning to the office, take time to review what went wrong. If you can't resolve an issue, go home, study further, or consult others. Some systems use inverters, servos, stepper motors, touchscreens, and other components that involve analog signals, temperature control, pulse inputs, and communication protocols. These elements are more advanced than basic PLC programming, but they are generally easier to learn once you have a solid foundation. With practice, you’ll become more comfortable with these technologies quickly. Self-study through books and online videos is helpful, but in real-life applications, you'll encounter strange instructions or functions that aren't covered in textbooks. Keep practicing, overcome obstacles step by step, and gradually build your knowledge and skills. The more you do, the better you'll get at solving problems and writing efficient, reliable code. Remember, learning PLC programming isn't just about writing code—it's about understanding the whole system, from hardware to software, and everything in between. Stay curious, keep experimenting, and never stop improving.
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