Mitsubishi Electric MELSEC FX3U Programming Manual page 808

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
4. Inputting and indicating a program using GX Developer
• Input a circuit for setting the initial state relay to ON using the relay ladder.
In this example, the initial state relay S0 is set to ON in a ladder block using the special auxiliary relay
M8002 which turns ON momentarily when the PLC mode is changed from STOP to RUN.
• When inputting a program using GX Developer, write a relay ladder program to a ladder block, and write an
SFC program to an SFC block.
• Programs expressing operations in state relays and transfer conditions are handled as internal circuits of
the state relays and transfer conditions.
Create each one using a relay ladder.
For details of programming procedure in GX Developer, refer to GX Developer Operating Manual.
Write a circuit not
belonging to SFC to a
ladder block using a
relay ladder.
Write an SFC program
to an SFC block.
806
M8002
Ladder block
SFC block
RET
35 SFC Program and Step Ladder
Program for setting the initial state
SET S0
relay to ON
Indicate the state relay number and
transfer condition number.
0
X000
0
Y023
20
X001
1
Y021
21
X002
2
22
T0
3
Y023
23
X003
4
Y021
24
X002
5
S0
When a program is input using GX Developer,
END
"RET" and "END" are automatically written.
35.1 SFC Program
TRAN
Y021
TRAN
Y023
TRAN
Input them as
T0
K50
internal circuits.
TRAN
Y021
TRAN
Y023
TRAN