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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
35 SFC Program and Step Ladder
35.2 Step Ladder
Output driving method
It is required to include a LD or LDI instruction before the last OUT instruction in a state relay.
Change such a circuit as shown below.
State relay transfer method
Each OUT and SET instructions in state relays automatically resets the transfer source, and has the self-holding
function.
OUT instructions can be used only for transfer to a separate state relay in an SFC program.
Replacing “ ” and “V”
Replace the symbol “ ” used in SFC programs to express repeat, jump or transfer to a state relay in another separate
flow with the OUT instruction.
Replace the symbol “V” (used to express reset of a state relay) with the RST instruction.
Y001
Change
Y002
Y003
Y001
X005
Y002
Y003
Move the
p
osition.
Y001
M8000
Y003
Y002
Insert "Always ON"
contact.
X005
RUN
monitor
or
STL S20
STL S20 STL S20
X005
Change
S50
STL S41
SET S42
Transfer
condition
Transfer to the next state relay
(SET instruction)
Transfer to a separate state
relay (OUT instruction)
41
40
Y001
1
X001
X003
X001
X002
TRAN
2
3
X003
TRAN
X004
TRAN
X002
X004
Y001
STL S40
SET S41
S52
STL S41
RST S41
Replacement of “ ”
in the part 52
Replacement of “ ”
in the part 41
<Step ladder><SFC program>
52
41