I really can’t stand those newcomers in the industry who ask the most ridiculous questions every day. Just yesterday, a guy came to me with a textbook asking why his ladder diagram program wasn’t working. When I opened it, it was a mess of logical relationships, and he couldn’t even distinguish between normally open and … Read more
It’s unbelievable, I see someone asking about PLC address allocation again. It’s already 2024, and people are still struggling with this issue, which is a common problem for field electricians. What is there to discuss? Alright, for the sake of all the newcomers, I will talk about it today to save you from stepping into … Read more
After observing the discussions about bit operations in the group over the past few days, it’s hard to express my feelings! Some of the bit operation codes written by people made my eyes hurt. If the fundamentals of these bit operations are not solid, you could end up in serious trouble on-site! Not to mention … Read more
Practical Application of Profibus DP Data Acquisition You may have heard of Profibus DP (Decentralized Peripherals), a protocol frequently used for data transmission in Siemens PLC projects, especially in industrial automation, where it is widely applied. Today, let’s discuss how to use Profibus DP for data acquisition, allowing it to easily interface with PLCs to … Read more
First, we will introduce our hardware preparations. 1. A weighing instrument that supports the Modbus protocol Weighing instrument that supports the Modbus protocol 2. Set the communication parameters of the instrument You can adjust according to your requirements, as long as it matches the PLC side. Baud rate: 9600 Data format: 8n1: 8 data bits … Read more
When ChatGPT Meets PLC The future has arrived. The story goes like this: I registered an OpenAI account, originally thinking of testing the chat, testing poetry writing, then I accidentally tested writing PLC programs, and it completely overturned my understanding… (There’s a surprise in the second to last paragraph) 01 Let’s Start with a Simple … Read more
Implementation of Virtualized Control Systems: My Experiences with Rockwell SoftLogix Introduction Hello everyone! I am your old friend Xiaoshuai, and I have been working in the field of automation control for fifteen years, mainly responsible for the design and implementation of industrial control systems. Today, I would like to share some experiences and insights regarding … Read more
Click the little blue text to follow! Yesterday, a friend working in industrial motor control complained that their production line frequently experiences inexplicable shutdown issues. Sometimes the motor suddenly reverses, and sometimes the safety door closes abnormally. After investigation, it was found that the problem lay in the state machine programming logic, where some boundary … Read more
Click the little blue text to follow! Last week, during a safety assessment at an automation factory, I witnessed their equipment experiencing an inexplicable shutdown. The manager looked worried and said, “This is the third time this month, and each shutdown costs us over a hundred thousand.” Where is the problem? After inspection, I found … Read more
In PLC programming, there are various flow control structures used to organize code, implement logical functions, and decision-making processes. When using ST (Structured Text), a programming language defined by the IEC 61131-3 standard, we can utilize control structures similar to those in high-level programming languages. Below are some commonly used flow control structures in ST … Read more