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Description
Technical Requirements:
After the controller is put into operation, its working process is generally divided into three stages, namely input sampling, user program execution and output refresh. The completion of the above three phases is called a scan cycle, during which the CPU of the programmable logic controller repeats the above three phases at a certain scanning speed.
In the input sampling phase of the programmable controller, the programmable logic controller reads all the input states and data successively by scanning, and stores them into the corresponding cells in the I/O image area. After the end of the input sampling, the user program execution and output refresh phase. In both phases, even if the input state and data change.
The state and data of the corresponding cell in the I/O image area will not change. Therefore, if the input is a pulse signal, the width of the pulse signal must be greater than one scan period to ensure that the input can be read in any case. After scanning the user program, the programmable logic controller enters the output refresh stage.
During this period, the CPU refreshes all output latch circuits according to the corresponding state and data in the I/O image area, and then drives the corresponding peripherals through the output circuit, which is the real output of the programmable logic controller.
110531004
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