Every line of ladder logic you write is not a command executed directly. It is merely a memo for an internal ‘invisible butler’. If you do not understand its almost obsessive three working rules, no matter how good your code is, it will be executed in a chaotic manner. Welcome to the internal world of … Read more
Clearly, the logic is correct, but when the button is pressed, the device hesitates for a moment as if contemplating life before acting? The same input signal is used twice in the program, yet the results can be strangely different? Many beginners frantically check the program, unaware that the root of the problem may lie … Read more
When faced with a brand new PLC, do you feel like you are confronting a silent black box? Once the program is loaded, it seems to act according to your will, which appears magical. But do you know what kind of endless “scan-decision-execute” cycle is taking place inside the moment it is powered on? Many … Read more
Introduction The PLC is known as the “nerve center” of modern factories; however, its workflow consists of only three steps: input sampling, program execution, and output refreshing. Yet it is the subtle differences in these three steps that create a gap between novices and experienced engineers, causing 90% of engineers to hesitate. 1. Input Sampling: … Read more
1 Introduction To understand how microcontrollers execute programs, it is essential to first comprehend the components of a microcontroller. This article uses the 80C51 microcontroller as an example to explain how programs run within a microcontroller. 2 Components of a Microcontroller The internal hardware structure of the 8051 microcontroller includes: Central Processing Unit (CPU): This … Read more
In microcontroller systems, the issue of electromagnetic compatibility (EMC) is one of the most challenging to resolve. It primarily stems from electromagnetic interference (EMI) both inside and outside the system, which can easily lead to abnormal operation of the microcontroller, thereby affecting the stability and reliability of the entire system. Therefore, it is essential to … Read more
