Before we learn about the basic building blocks of the C language, let’s take a look at a minimal C program structure, which can serve as a reference in the upcoming chapters. C Hello World ExampleC programs mainly consist of the following parts: preprocessor directives, functions, variables, statements & expressions, and comments. Let’s look at … Read more
1.6 Bookstore Program This section is the “comprehensive case” of Chapter 1—combining the previously learned input and output,<span><span>if</span></span>、<span><span>for</span></span>、<span><span>Sales_item</span></span> class to write a program that “processes sales records of multiple books”. The function is to read the sales records of multiple books, accumulate the sales data of the same ISBN, and finally output the total sales … Read more
1. Improving CPU UtilizationWhenever I see a program filled with delay_ms(), I get a headache. Software delays of several tens of milliseconds are a huge waste of CPU resources, with precious CPU time wasted on NOP instructions.It also troubles me when the entire program halts just to wait for a pin level change or serial … Read more
Shocking the Industry! Optimizing PLC Scan Time for Incredible Efficiency Gains At three o’clock in the morning, I stood in front of a packaging production line, watching the flashing “Scan Timeout” alarm on the display, feeling heavier than the night outside. The client’s production manager paced back and forth beside me, asking every few minutes, … Read more
Architectural Design: How to Plan Siemens PLC Program Structure? A Three-Tier Architecture for Clear and Maintainable Code! Hello everyone! In my years of experience in automation projects, I have found that many engineers write PLC programs like a “running account”—writing a segment for each requirement and adding a block for each new device. As a … Read more
Recently, a young electrician came to ask about PLC configuration. Looking at his program, I was truly speechless. Today’s young people seem to just throw everything into the code without considering the basic scanning cycle. Back in the day when I started in this field, we didn’t even have decent programming software; we used old-fashioned … Read more
PLC Performance Optimization: Reducing Redundant Scanning and Lowering CPU Load by 35%! 📚 Estimated reading time: 8 minutes > This article will detail the core techniques for PLC performance optimization, helping you significantly reduce CPU load. > – Is your PLC program often experiencing long scan cycles? – How to solve high CPU load issues? … Read more