1. Bidirectional Movement of the Cart Implement automatic control of a cart moving back and forth using S7-200. The control process involves pressing the start button, causing the cart to move from left to right (and vice versa). When it reaches the right (or left) limit switch, the cart automatically returns. This back-and-forth movement continues … Read more
“PLC Sorting Black Technology: 5 Times Efficiency Strike! Say Goodbye to the ‘Busy Mode’ in Factories” Hello everyone! Today, let’s talk about a heart-wrenching topic—Is your factory’s sorting line still performing the ‘manual connect the dots’? Workers chasing parts, barcode scanners sparking, and monthly inventory never matching up? Don’t panic! Old Zhang will take you … Read more
“PLC Fault Prediction: AI Provides 72-Hour Early Warning, A Lifesaving Secret for Factories!” Hey, factory folks! Today, let’s talk about something serious—who hasn’t been scared out of their wits by an equipment failure alarm in the middle of the night? Last week, Old Wang called me, saying that the PLC at his factory suddenly went … Read more
Intermediate PLC Programming: Interrupt Priority Design for Timely Response to Critical Tasks! Introduction Hello everyone! Today I want to share a magical technique that can make your PLC program “perceptive” — interrupt priority design. Don’t worry about the technical jargon; I will explain this seemingly profound concept in the most relatable way. By mastering this … Read more
Introduction In the era of Industry 4.0 and the Industrial Internet of Things (IIoT), seamless connectivity and real-time monitoring are crucial for efficient industrial processes. However, a common challenge in this field is the quick access to HMI visualization interfaces, especially when dealing with multiple PLCs scattered throughout a factory or during maintenance operations. Traditional … Read more
In PLC programming, we often encounter some professional English vocabulary, which can be very difficult for beginners to understand. This article summarizes some commonly used professional English vocabulary for PLCs and provides translations. 01Words starting with ‘a’ absolute absolute position Absolute output absolute maximum output actuator actuator against comparison allocate allocation alter change/modification ambient surrounding … Read more
PLC Communication Made Easy: A Shortcut to Mastering the Modbus Protocol Hello everyone, I am Lao Liu. With over twenty years of PLC programming experience, I can tell you that many beginners are most afraid of the communication part. Today, let’s talk about something practical—the Modbus protocol. It may seem complex, but it is essentially … Read more
“PLC High-Speed Counters: The Black Technology That Makes Equipment’s ‘Heartbeat’ Accurate to 0.1%!” 1️⃣ Single-phase Counter: The ‘Lone Ranger’ Expertise: A single signal line can handle simple counting scenarios. Pitfall: Weak anti-interference ability, prone to ‘going crazy’ under electromagnetic interference. 2️⃣ Dual-phase Counter: The ‘Dual Swordsman’ Expertise: Two signal lines distinguish forward and reverse rotation, … Read more
In PLC programming, the physical contact of the stop button is generally connected as normally closed, while in the program, it is written as normally open. This type of stop button only serves as a signal in this equipment.Why is the emergency stop in PLC programming opposite to that of a regular emergency stop button? … Read more
In recent years, the explosive development of wireless technology has given rise to various industrial, scientific, and medical (ISM) band wireless standards. With these new standards, various wireless applications have permeated every aspect of our daily lives. Undoubtedly, Wireless Sensor Networks (WSN) are one of the most significant applications benefiting from these standards. Imagine a … Read more