OMRON PLC and other PLC implementation is basically the same, the implementation of the user program features are as follows:
① follow the ladder from left to right, from top to bottom to execute the program
② the required data to execute the program from:
Input image register
Component image register
③ input image register and component image register data
Input image register: remains unchanged for one scan cycle
Component image register: readable and writable in one scan cycle
④ Each scan cycle I / O refresh phase focus read / read data

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