Three basic process of PLC's work content

PLC adopts circular scanning ways of working, the user program in the PLC in order to deposit, the CPU from the first instruction execution procedures, until the end and then return to the first, so the cycle cycle. PLC controller scanning process is divided into internal processing, communication, program input processing operation, program execution, output stages. The time needed for the whole process of scanning a called scan cycle. When PLC in a stopped state, only for internal processing and communications operation services, etc. In PLC in running state, from internal processing, communication, program input operation, program execution, output, working cycle scan. Input processing input processing is also called the input samples. At this stage, the sequence reads all the input terminal of the side state, and will read the information stored in memory of the image to register. In the input image register be refreshed. Then entered into the phase of program execution. During program execution, the input image register isolation with the outside world, even if the input signal changes, the image will not change the contents of a register, only the next input processing phase scan cycle, can be read in information. Program execution according to the principle of ladder diagram procedure of PLC scan, according to the first left after the right after the first step in the sequence, every scan, execute a program. Jump instruction program, according to the jump condition meets decided to jump the address of the program. From the user program involves the input and output state, PLC from the input image register readout on mining into the state of the corresponding input terminal of a stage, from the output image read corresponding image registers, according to the user program logic operations, deposited in the related device register. For each device, the device image register in the register of the content, will change with the process of program execution. Output handler execution has been completed, the output image registers, the device image states of the Y register in the register, transferred to the output latch in the output stage of processing, through isolating circuit, drive power amplification circuit, the output terminal output control signal to the world and the external load.
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