After the completion of PLC programming, in order to ensure the reliability of the program, it is usually necessary to check the syntax and format of the program. The inspection shall include the following basic contents:

① Generally, there should be no repetitive coils in the program (except for special use);

② Generally, there should be no signal with only contact and no output in the program

③ If symbolic address is used in the program, there should not be variables with undefined symbols;

④ Generally, there should be no output point without programming in the program

⑤ Generally, there should be no unused input points in the program

⑥ Generally, there should be no logic block not called in the program.

In Siemens STEP7, the above contents can be specially counted, summarized and summarized through the display of the so-called “reference data”.

Editor in charge: LQ

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