768
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
34 SFC Program and Step Ladder
34.2 Step Ladder
Program with jump/repeated flows
1. Program for the transfer source
Use OUT instruction in the jump/repeated part.
2. Program for the transfer destination
There is no change in programming especially for the transfer destination.
34.2.5
Preliminary knowledge for creating step ladder programs
Refer to the preliminary knowledge for creating SFC programs also.
→
For the preliminary knowledge for creating SFC programs, refer to Subsection 34.1.7.
List of sequence instructions available between STL instruction and RET instruction
• STL instruction cannot be used in interrupt programs and subroutine programs.
• It is not prohibited to use jump instructions in state relays. But it is not recommended to use jump
instructions because complicated movements will be resulted.
*1.
MPS instruction cannot be used immediately after an STL instruction, even in a drive processing
circuit.
Instruction
State relay
LD/LDI/LDP/LDF,
AND/ANI/ANDP/ANDF,
OR/ORI/ORP/ORF,
INV,OUT,SET/RST,
PLS/PLF
ANB/ORB/MPS/MRD/
MPP
MC/MCR
Initial/general state relay
Available
Available
*1
Not available
Branch/
recombination state
relay
Drive processing
Available
Available
*1
Not available
Transfer processing
Available
Not available
Not available
STL
LD
OUT
LD
SET
LD
OUT
41
40
Y001
1
X001
X003
X001
X002
TRAN
2
3
X003
TRAN
X002
Y001
STL
S40
SET
S41
S52
<Step ladder>
<SFC program>
52
<List program>
S40
X001
Y001
X002
S41
X003
S52
Jump/repeated part
Use OUT instruction in the jump/
repeated part.
STL
LD
OUT
LD
SET
53
52
Y002
3
X004
X004
X005
TRAN
4
X005
Y002
STL
S52
SET
S53
<Step ladder>
<SFC program>
<List program>
S52
X004
Y002
X005
S53