Mitsubishi Electric MELSEC FX3U Programming Manual page 414

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
5. Program example
1) Circuit diagram
In the sequence circuit shown below, all areas except shaded areas are standard.
Program the shaded areas according to the contents of control.
a) Initial circuit
While the machine is operating, the operation mode can be switched arbitrarily (among stepping
operation, cycle operation and continuous operation) in the automatic mode.
When the operation mode is switched between the individual operation mode, zero return operation
mode and automatic mode while the machine is operating, all outputs are reset once to assure safety,
after which the following mode becomes valid.
(While M8045 (All output reset disable) is ON, outputs are not reset at all.)
Ladder block
b) Individual operation mode
Programming is not required when the individual operation mode is not provided.
SFC block
Initial state
for individual
operation
412
Detects that the machine is located at the zero point, and
regards it as the condition to start the automatic mode.
X004 X002 Y001
Upper
Unclamping
Left limit
limit
M8000
FNC 60
X020
IST
RUN
monitor
State number
X012
Clamping command
0
Unclamping
X007
command
Moving-up
X005 command Y000
Moving-down
command Y002
X010
Leftward travel
X006 command
Rightward travel
X011 command
M8044
Zero point condition
S 20 S 27
Initial state
Clamping
SET Y001
RST Y001
Moving
Y002
up
Moving
Y000
down
X002 Y003
Leftward
Y004
travel
X002 Y004
Rightward
Y003
travel
Upper limit
14 Handy Instruction – FNC 60 to FNC 69
14.1 FNC 60 – IST / Initial State