Clearly, the logic is correct, but when the button is pressed, the device hesitates for a moment as if contemplating life before acting? The same input signal is used twice in the program, yet the results can be strangely different? Many beginners frantically check the program, unaware that the root of the problem may lie … Read more
Click to enter the Fast Procurement Mini Program ➡️, a bearing industrial control electronic procurement platform with 500,000 registered users and over 5,000 real-time demands updated daily. Why not take a look? Introduction: A Programming Hazard That Must Be Eradicated In the programming practice of Programmable Logic Controllers (PLCs), “Double Coil Output” refers to the … Read more
Core Principles of Mitsubishi PLCs 1.1 Basic Structure The Mitsubishi PLC mainly consists of the following components: CPU Module: The core processing unit responsible for executing user programs and system programs Memory Module: Includes system program memory and user memory I/O Module: Input/output interface that connects to external devices Power Module: Provides a stable DC … Read more
A Beginner’s Guide to Avoiding Pitfalls in PLC Programming | A Summary from Experienced Engineers In the field of industrial automation, PLCs (Programmable Logic Controllers) are no longer just simple logic control devices; they have become the intelligent control core that integrates data processing, communication, motion control, and various other functions. However, with the richness … Read more
3 Techniques to Solve Slow PLC Program Execution and Instantly Boost Device Performance Five years ago, on a late night, I was urgently called to a packaging production line. The client was frantic—the newly commissioned equipment was running 30% slower than expected, packaging 20 fewer products per minute, leading to significant daily losses. Upon inspecting … Read more
The PLC scan cycle refers to the time required for a PLC to complete one full scan (including input sampling, program execution, and output refresh). The length of the scan cycle directly affects the real-time performance and control accuracy of the PLC. The following are the main factors that influence the PLC scan cycle: 1. … Read more
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
