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2023-01

09

How programmable controllers (PLCs) work

The PLC uses a serial cyclic scan mode of operation. The so-called scan means that the CPU starts executing the program from the first instruction until the last instruction (end instruction). The scanning process is roughly divided into the following three phases.(1) Input sampling stageIn the input…
2023-01

09

What is a distributed control system

An automatic control system in which multiple computers control multiple control loops in the production process, while allowing centralised access to data, centralised management and centralised control. Distributed control systems use microprocessors to control each loop separately, while small and…

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