What is the cycle of PLC scan mechanism? PLC scan cycle generally includes several stages?

When the operation of the PLC, operation of CPU will execute user programs. But the CPU cannot perform multiple operations at the same time, the only points to a operation to perform an operation. PLC controller was built with the system software in its internal input and output image area, when the PLC controller CPU execution of user programs, read the state of the input signal from the input image area, for the corresponding operation. When the CPU execution after the first operation, the operating results output to the output image area, and then perform a second operation, the operating results to the output image area. In the process of program execution, PLC does not read the real state of the input signal, the results did not output to the outside of the PLC. Only when the program execution to the end of instruction ( 结束) , the output image area outside the execution result to the PLC output at a time, to the state of the input signal is read to the input image region at a time. The input and output signal of the operation process known as I/O refresh. After completion of the I/O refresh, CPU and starting from the first instruction of the user program, the next program execution. This way of working is called scanning way of PLC. PLC controller scan cycle including electricity after initial treatment, common treatment, upper link services, peripheral services, processing, and the I/O refresh.
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