Yesterday, a colleague called me in a panic, saying: “Wen, help! My PLC-based smart home system is completely down, and the owner is coming for acceptance in half an hour!” Hearing this familiar “fire-fighting” scenario made me smile. Ten years ago, I was in the same boat, where a small issue could drive me crazy … Read more
The PLC system is like the human nervous system; its inputs and outputs are how it perceives and controls the world. However, sometimes this “nervous system” can encounter issues—buttons not responding, indicator lights not illuminating, motors not turning. These input/output response problems can be frustrating, especially during an emergency shutdown on the production line. Don’t … Read more
Have You Fallen into These Pitfalls When Connecting a Bluetooth Watch to Your Phone? Have you ever had this experience: you excitedly bought a Bluetooth watch, wanting to enjoy the convenience of smart living, but when trying to connect it to your phone, it either won’t connect or has various issues? After fiddling with it … Read more
modetest -M rockchip ❝ When connecting an EDP interface display to the motherboard, if the error “LT CR Failure” (Link Training & Clock Recovery failure) occurs, the following are possible causes and solutions: 1. Core Reasons for Link Training Failure Poor Signal Integrity The EDP signals (differential pairs) from the motherboard to the display may … Read more
NB Smart Gas Meter User Guide IntroductionThe current NB-IoT smart gas meter (hereinafter referred to as NB meter) has entered thousands of households, allowing users to recharge online via WeChat without leaving home. Additionally, there are many features waiting for you to unlock! #01 Understanding the NB Meter The NB meter is equipped with a … Read more
The multimeter is a multifunctional, multi-range instrument that is widely used and favored by electrical technicians. It can easily measure various electrical parameters such as insulation resistance, low resistance, general resistance, voltage, current, capacitance, diodes, frequency, duty cycle, and TYPE K temperature, playing a crucial role in the maintenance, repair, and troubleshooting of electrical systems. … Read more
Click the blue text to follow! Rapid Troubleshooting Practices of Structured Text in IoT Applications 1 The Truth Behind the Fault Last Tuesday, Xiao Zhang rushed over to me, saying: “Master Li, the data acquisition system on production line 3 has malfunctioned again, and the monitoring center can’t see the temperature data. Production is about … Read more
Click the blue text to follow! Old Li Talks Technology: The Matters of PLC Robot Control Remote Monitoring 1 An Unexpected Inspiration Last week, the robotic arm on the assembly line suddenly stopped working, paralyzing the entire production line. The production manager was frantic, and the young engineers in the technical department couldn’t find the … Read more
Optimizing PLC Protocol: Setting Communication Timeout Parameters to Enhance Adaptability in Harsh Environments! Introduction Dear automation engineers, today I want to share a particularly practical technique for harsh industrial environments — optimizing PLC communication timeout parameters! I believe many of you have encountered this issue: in factories with severe electromagnetic interference and aging lines, PLC … Read more
In a Linux cluster environment, quickly identifying issues and monitoring system performance are core skills for operations personnel. This article compiles 17 high-frequency commands covering system monitoring, process management, resource analysis, and more to assist you in efficient operations. 1. Overall System Monitoring 1. top/htop Real-time view of CPU, memory, and process status, supporting dynamic … Read more