YASKAWA CP-9200SHSVA PLC module
PLC adopts The method of “sequential scanning and continuous circulation” is used to progress the work. That is, when the PLC is running, the CPU compiles the program stored in the user memory according to the user’s control requirements, and performs periodic cyclic scanning according to the instruction step number (or address number). If there is no jump instruction, the user program will be executed sequentially from the better instruction until the program is completed. Then, the CPU will return the better instruction and start the next round of scanning In the secondary scanning process, the sampling of the input signal and the refreshing of the output state should also be completed.
A scanning cycle of PLC must go through three stages: input sampling, program execution and output refresh.
In the input sampling stage of PLC: first, read in the on-off state or input data of all input terminals temporarily stored in the input latch in sequence by scanning, and write them into the corresponding input state registers, that is, refresh the input. Then close the input port and enter the program execution phase.
In the program execution stage of PLC, each instruction is scanned and executed according to the order in which the user program instructions are stored. After corresponding calculation and processing, the results are written into the output state storage device, and all the contents in the output state storage device change with the execution of the program.
Output refresh stage: when all instructions are executed, the on-off state of the output state storage device is sent to the output latch in the output refresh stage, and output in a certain way [relay, transistor or thyristor] to drive the corresponding output device to work.
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