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(2) Sequence program operation method
Sequence program operation repeats execution from a ladder block at step 0 to
an END instruction.
In a single ladder block, operation is performed from the left hand side vertical
bus to the right, and from the top to the bottom.
Fig 3.3 Operation Processing Sequence
Beginning of one
ladder block
Operation from left to right
End of one
ladder block
Operation from left to right
Execution
returns to
s
tep 0 when
END
instruction is
executed.
*
1) to 17) indicate the sequence of program operation.
1)
2)
7) 8) 9)
10)
3) 4)
5)
6)
11) 13) 14)
12)
15)
16)
17)
Operation
from top
to bottom
Operation
from top
to bottom
END
End of one
ladder block
Beginning of
one ladder block