Mitsubishi Electric Q172DCPU User Manual page 99

3 DESIGN
FOR AC
Power supply
Transformer
Fuse
SM52
SM403
START SW
RA1
STOP SW
MC
Output module
Ym
Yn
Output module
MC
The power-ON procedure is as follows:
For AC
1) Switch power ON.
2) Set CPU to RUN.
3) Turn ON the start switch.
4) When the magnetic contactor (MC) comes on, the output
equipment is powered and may be driven by the program.
(2) System design circuit example of the PLC I/O
(a) System design circuit example(when not using ERR terminal
of power supply module)
Input switched when
power supply established
CPU module
RUN/STOP circuit
Ym
interlocked with RA1
(run monitor relay)
Yn
Program
MC
Input module
Low battery alarm
(Lamp or buzzer)
L
ON when run by SM403
RA1
MC
Power to output equipment
switched OFF when the
STOP signal is given.
In the case of an emergency
MC2
stop or a stop caused by a
MC1
limit switch.
MC1
Interlock circuits as necessary.
MC2
Provide external interlock
circuits for conflicting
operations, such as forward
rotation and reverse rotation,
and for parts that could
damage the machine or cause
accidents if no interlock were
used.
Power supply
FOR AC/DC
Transformer Transformer
Fuse
CPU module
SM52
Ym
SM403
Yn
XM
TM
TM
N0 MC1 N0 M10
M10
Program
START SW
RA1
MC
STOP SW
MC
RA2
Output module
Ym
Yn
RA1
Output module
MC2
MC1
MC1
MC2
For AC/DC
1) Switch power ON.
2) Set CPU to RUN.
3) When DC power is established, RA2 goes ON.
4) Timer (TM) times out after the DC power reaches 100[%].
(The TM set value should be the period of time from when
RA2 goes ON to the establishment of 100[%] DC voltage.
Set this value to approximately 0.5 seconds.)
5) Turn ON the start switch.
6) When the electromagnetic contactor (MC) comes on, the
output equipment is powered and may be driven by the
program. (If a voltage relay is used at RA2, no timer (TM) is
required in the program.)
3 - 6
Fuse
DC power
(-) ( )
+
Fuse
Set time for
DC power
supply to be
established
RA2
Voltage relay is
recommended
XM
Low battery alarm
(Lamp or buzzer)
L ON when run
by SM403
MC
MC
Power to output
equipment switched
OFF when the STOP
signal is given.
In the case of an
emergency stop or
a stop caused by
a limit switch.