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CHAPTER2 SEQUENCE PROGRAMS
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2.2 Sequence Program Configuration
2.2.1 Main routine program
2.2.1 Main routine program
(1) Definition
Main routine program is an entire program from the step 0 to the END or FEND instruction.
(2) Program operation
A main routine program executes its operations from the step 0 to the END or FEND instruction and then
performs END processing.
After the END processing, the program restarts its operations from the step 0.
When multiple programs are executed, the main routine program operation after execution of the END or FEND instruction
varies depending on the preset execution conditions. ( Section 2.3)
For details of the END and FEND instructions, refer to the following.
MELSEC-Q/L Programming Manual (Common Instruction)
Figure 2.5 Main routine program
END/FEND
END/FEND
Main routine
program
Step 0
END
processing
Indicates execution of
the program.
The program operation
returns to the step 0.
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