Mitsubishi Q172CPU User Manual page 129

3 DESIGN
Using AC
Power supply
Transformer
Fuse
SM52
SM403
Start Stop
switch
switch
RA1
MC
Output module
Ym
Yn
Output module
MC
MC2
MC1
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 electromagnetic contactor (MC) comes on, the
output equipment is powered and may be driven by the
program.
(4) System design circuit example of the PLC I/O
(a) System design circuit example(when not using ERR contact of
power supply module)
DC power supply
established signal input
CPU
START/STOP circuit
Ym
Starting possible
when the PLC RUN
output RA1 is ON
Yn
Program
MC
Input module
Alarm output
(lamp or buzzer)
L
RA1 switched
ON by SM403
RA1
MC
Turns output equipment
power off when STOP
occurs.
on emergency stop,
on stop at upper/lower
MC1
limit switch
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
Using AC and DC
Transformer
Fuse
CPU
SM52
Ym
SM403
Yn
XM
TM
TM
MC1 N0 M10
N0
M10
Program
Start Stop
switch
switch
RA1
MC
MC
RA2
Output module
Ym
Yn
Output module
MC2
MC1
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 - 10
Transformer
Fuse
DC power
supply
(-) (+)
Fuse
Set TM to time
to establish
DC input signal
RA2
A voltage relay
is recommended
Input module
XM
Alarm output
(lamp or buzzer)
RA1 switched
L
ON by SM403
RA1
MC
MC
Turns output
equipment
power off when
STOP occurs
MC1
on emergency
stop, on stop at
MC2
upper/lower limit
switch