Mitsubishi Electric melsec q03ud(E)cpu - Sequence Program Configuration; Main Routine Program

CHAPTER2 SEQUENCE PROGRAMS
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2
3
4
5
6
7
8
2.2 Sequence Program Configuration
2 - 3
(3) Sequence program operation
A sequence program is sequentially operated from the step 0 to the END or FEND instruction.
In ladder mode, a sequence program is operated from left to right and top to bottom in a ladder block.
2.2 Sequence Program Configuration
Sequence programs are classified into the following three types.
• Main routine program
• Subroutine program
• Interrupt program
Figure 2.3 Comparison between ladder mode and list mode
Figure 2.4 Sequence program classification
X0 X1 X5 X6 X7
X2
X3
X4
Y10
0
10
END
0 LD X0
1 AND X1
2 LD X2
3 AND X3
4 ORB
5 OR X4
6 AND X5
7 AND X6
8 AND X7
9 OUT Y10
10 END
1) 2)
3)
6)
4)
5)
7) 8) 9)
10)
11)
0)
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
[Ladder mode]
From left to right
From top
to bottom
* Program operations are executed in the
order of 1) to 11).
[List mode]
Program
operations are
sequentially
executed from
the step 0 to the
END instruction.
Step number
FEND
RET
IRET
END
P0
I0
File A
Main routine
program
Subroutine
program
Interrupt
program