中文版
Description
PLC is the use of “sequential scanning, continuous cycle” way to work. That is, when the PLC
is running, the CPU is prepared according to the user’s control requirements and exists in the
user’s memory program, according to the instruction step number (or address number) for
periodic cycle scanning, if there is no jump instruction, the user program is executed successively from
the beginning of the instruction until the end of the program. Then return the bar command to start the
next round of new scanning. In the process of each scan, it is necessary to complete the sampling of the
6ES7626-2DG04-0AE3
input signal and refresh the output state. A PLC scan cycle must be input sampling, program execution and
output refresh three stages. In the input sampling stage, PLC first reads the on-off status or input data of all
the input terminals that temporarily exist in the input latch in order by scanning, and writes them into the
corresponding input status register, that is, refresh the input. Then close the input port, enter the program
execution level. PLC in the program execution stage: scan and execute each instruction according to the
sequence of user program instructions stored, after the corresponding operation and processing, the result is
written into the output status register, and all the contents of the output status register change with the execution of the program.
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