Mitsubishi Electric MELSEC FX3U Programming Manual page 841

Melsec fx series programmable logic controllers
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FX
/FX
/FX
Series Programmable Controllers
3G
3U
3UC
Programming Manual - Basic & Applied Instruction Edition
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.
X005
X005
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.
Transfer
condition
Replacing "
" and " "
Replace the symbol "
separate flow with the OUT instruction.
Replace the symbol " " (used to express reset of a state relay) with the RST instruction.
<SFC program>
X001
40
X002
1
41
X004
2
41
STL
S20
Y001
Y002
Y003
Change
STL
S20
Y001
or
Y003
Y002
Move the
position.
STL
S41
Transfer to the next state relay
SET
S42
(SET instruction)
Transfer to a separate state
S50
relay (OUT instruction)
" used in SFC programs to express repeat, jump or transfer to a state relay in another
Y001
X003
3
TRAN
TRAN
52
Change
X005
M8000
RUN
monitor
<Step ladder>
X001
X002
TRAN
X003
X004
35 SFC Program and Step Ladder
35.2 Step Ladder
STL
S20
Y001
Y002
Y003
Insert "Always ON"
contact.
STL
S40
Y001
SET
S41
Replacement of "
S52
in the part 52
STL
S41
Replacement of "
RST
S41
in the part 41
31
32
33
34
35
36
37
38
A
"
"
B
839

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