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SEQUENCE PROGRAMMING
3.4.2 Logic symbolic language (List mode)
The logic symbolic language uses dedicated instructions for programming contacts,
coils, etc. instead of their symbols used by the relay symbolic language.
(1) Program operation method
Sequence program operation is executed from an instruction at step 0 to an END
instruction in due order. When the END instruction is executed, operation is
executed from the instruction at step 0 again.
Fig 3.4 Operation Processing Sequence
Logic symbolic language Relay symbolic language
Step number
O
p
e
r
a
t
i
o
n
s
e
q
u
e
n
c
e
Execution returns to step 0
when END instruction is executed.
1)
1) 2) 7) 8) 9)
10)
3) 4)
5)
6)
11)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)