Advanced Linux Operations: In-Depth Analysis from Basic Commands to System Optimization Introduction: Have You Encountered These Crashing Moments? At 2 AM, you are abruptly awakened by a phone call: “Online service response timeout, widespread user complaints!” You hurriedly open your computer, SSH into the server, and face a screen full of processes and logs, your … Read more
Troubleshooting and working principle of the magnetic safety sensor, model, and wiring 1. Fault 2. Based on the alarm prompt, it may be a signal issue. Check the device I/O and find that after the door lock is closed, the corresponding signal 324S1 of the magnetic safety sensor is not 1, and the green indicator … Read more
Introduction The statement “communication is the most frustrating aspect of PLCs” resonates widely among automation engineers, electrical technicians, and field maintenance personnel. This is not an exaggeration, but rather a conclusion drawn from the inherent complexity of communication, the harshness of field environments, and the rapid pace of technological iteration. We can delve into the … Read more
Can’t Open Douyin Command? Don’t Worry! 3 Super Simple Unlock Methods (with Pitfall Guide) 💥 Opening Remarks When you come across a Douyin command shared by a friend, you click on it with excitement only to see “Cannot Open”? Don’t panic! This could be due to the command being collapsed, the link being invalid, or … Read more
Friends who do automation debugging or maintenance have likely encountered this scenario: the PLC suddenly lights up a red alarm, the screen flashes unfamiliar codes, and in a panic, you frantically flip through the manual, only to find yourself more confused. In fact, most mainstream PLCs come with a built-in “self-diagnosis” function. The key to … Read more
“When weighing on a digital scale, the numbers jump around, and when I change positions, I weigh 3 pounds more. Is the sensor broken?” My friend often doubts her weight fluctuating, thinking the digital scale is about to be discarded. I helped her level the feet under the scale, and the numbers became stable and … Read more
Cannot be powered on Beep mode: Measure continuity: wires, fuses, switches. Ohm mode: Measure resistance: heating elements, motors, leakage. Ω = Ohm, KΩ = kilo-ohm, MΩ = mega-ohm (leakage) 1KΩ = 1000Ω, 1MΩ = 1000KΩ (common range: 2K) (grounding 20MΩ-200MΩ) Leakage: Measure insulation resistance. Greater than 0.5 mega-ohm: no leakage ✔ Less than 0.5 mega-ohm: … Read more
In the workshop, you’re in a hurry to debug the program, but the PLC and computer just won’t connect; despite following the wiring tutorial, the software keeps reporting “communication failure”; as a beginner, you’re at a loss with a bunch of wires, just waiting for a technician — does this sound like your experience when … Read more
In non-standard automation projects, Modbus communication failures are one of the most troublesome issues for engineers. Sudden device disconnections, abnormal data transmission, communication timeouts… These problems not only affect production efficiency but can also lead to the shutdown of the entire production line. After years of practical experience, we have summarized this 5-minute quick troubleshooting … Read more
At the beginning of the year, Alibaba Cloud released a related announcement that MongoDB versions 3.0 and 3.2 have entered the mandatory EOFS phase.For those in the cloud, who hasn’t upgraded yet??? Alibaba Cloud’s announcement regarding MongoDB [Notice] MongoDB 3.0 and 3.2 version instances are scheduled to terminate service (EOS) on December 31. MongoDB 6.0 … Read more