1756-LSP

The central processing unit (CPU) is the control center of the programmable logic controller. It receives and stores user programs and data typed from the programmer in accordance with the functions assigned by the programmable logic controller system program; checks the status of power, memory, I/O, and watchdog timers, and can diagnose syntax errors in the user program. When the programmable logic controller is put into operation, it firstly receives the status and data of each input device in the field by scanning, and stores them in the I/O image area respectively, and then reads the user program one by one from the user program memory. After the command is interpreted, the result of the logic or arithmetic operation is executed in the I/O image area or data register as specified by the instruction. After all the user programs have been executed, the output status of the I/O image area or the data in the output register is finally transferred to the corresponding output device, and the operation is cycled until the operation is stopped.

In order to further improve the reliability of the programmable logic controller, a large-scale programmable logic controller is also configured with a dual CPU to form a redundant system, or a three-CPU voting system. This way, even if a CPU fails, the entire system will still operate normally.

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