Over 70,000 friends have followed this industrial control WeChat platform:Technical sharing, Learning exchange, Industrial control videos PLCs have strong self-diagnostic capabilities. When there is a fault in the PLC itself or in peripheral devices, the diagnostic indicator function of the PLC, indicated by the on/off state of the LEDs, can be used for diagnosis. I. … Read more
Click the blue text for more exciting information Remote Monitoring Projects That Were Ruined by Industry 4.0 Honestly, I have been in this industry for almost 20 years and have seen too many so-called “factory informationization” projects end up as a pile of scrap metal. Last summer, a paper mill in Zhejiang spent a lot … Read more
Search on WeChatTechnical TrainingWhat is PLC? Learn about PLC through the following three parts:The concept of PLC, what PLC can do, and how to wire PLC. Concept of PLC / Part 1. PLC (Programmable Logic Controller) means: Programmable Logic Controller. Before the advent of PLC, traditional circuits were like this (as shown in the figure … Read more
Today, I will present an example of interference from a variable frequency drive (VFD) on a PLC’s analog signal and a solution using a signal isolation module to overcome such interference. 1. Example 1: Phenomenon Description In a Siemens PLC, the AO point outputs a 4-20mA current control signal to a Siemens VFD, but it … Read more
PLC Application Example: Biscuit Oven Temperature Control System Increases Product Consistency by 30%! Introduction “Why do biscuits from the same batch always have different colors?” This is a quality issue that troubles many biscuit manufacturers. Today, I want to share a real PLC application case — biscuit oven temperature control system upgrade, which has improved … Read more
Click the blue text to follow! PLC Safety Control Matters: Insights from an Experienced Electrician Last month, the automated production line in Xiao Wang’s workshop suddenly crashed, and even the safety light curtain was unresponsive, almost leading to a personal injury incident. Later, the factory manager called me to check, and I found that the … Read more
Click the blue text for more exciting information Enhancing Flexibility in IoT Applications through Object-Oriented Programming in PLCs To be honest, I have never understood why so many people think that PLC programming must use ladder diagrams. What era are we in, still drawing relay logic? After nearly 20 years in this field, those who … Read more
Click the blue text for more exciting information Remote Monitoring Solutions for Industrial Automation Driven by PLC Function Block Diagrams Just two days ago, I received a call; Old Li’s paper mill had another problem. He insisted on using that cheap domestic RTU for protocol conversion last time, and now, well, it keeps dropping connections … Read more
Today, I will introduce some control programs for single button start-stop (also known as one-click start-stop programs). This involves using a momentary button: press once to turn on a light bulb, press again to turn it off, and repeat… Although this seems like a simple program, many people may struggle to implement it. This topic … Read more
Click the blue text to follow! Old Li Talks Technology: PLC Function Blocks Make Automation Debugging Painless 1 The Emergency Repair in the Workshop Last Thursday, the automated production line in the injection molding workshop had another issue. Xiao Wang rushed to find me: “Old Li, the No. 3 injection molding machine has stopped, the … Read more