But in terms of stability, it is not as good as before. If you still remember the products of that era, such as Xijia's S5, Luojia's PLC5 and Schneider's Modicon 984, they were extremely stable and could even run for decades without any protection, while modern However, the products often need to add protection requirements such as G3 anti-corrosion, which shows that modern PLCs have problems in terms of stability. As it happens, I summarized some embedded material and put it at the end of the video.
At that time, PLC required designers to design parameters and select types of circuit boards and components. These designers were all circuit enthusiasts. Therefore, the reliability and stability of PLC at that time were extremely high, but the user-friendly operation was relatively poor. This is limited by the development background of the operating system. The current PLC circuit board is much simpler, except for chips and simple peripheral circuits, there are almost no other components. This highly integrated design is simple, but the reliability is greatly reduced.
As a user, we need to pay more attention to the stability of the PLC itself, especially for large-scale PLCs and redundant architecture products, stable operation of the control program is the top priority. We need to collect and output IO in a logical manner, and then consider other function expansions.
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