1. It is impossible to be simple at the same time, and at the same time it is relative. The CPU can only run one program at a given time.
2. Understand that S7-300PLC is a cycle scan: ie
a. At the beginning of a regular cycle, the CPU performs signals such as input jobs (fill in the input image area data).
b. Subsequently, all procedures shall be performed in accordance with the rules of PLC performance procedures during the current period.
c. At the end of the periodic code scanning, according to the results of the program performance, the CPU fills in the input image area data.
d. The CPU outputs the signal according to the input image area data.
3. The mechanism of S7-300PLC to fulfill the instructions is:
From top to bottom, from left to right.
4. Can I edit two FB blocks, the two blocks are separated to complete the control of the operation of the two sets of mechanical organizations, the two sets of mechanical structures can not conflict, and the two FB may call the same FC subroutine at the same time, can it be completed, is there a better way?
Absolutely.
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