Mitsubishi Q2ACPU User Manual page 296

19. LOADING AND INSTALLATION
(1)
AC system
Power supply
Transformer
Fuse
CPU module
SM52
SM403
Program
Start
switch
RA1
Stop
MC
switch
Input module
Output module
Ym
Yn
Output module
MC
MC2
MC1
The procedures used to switch on the power supply are indicated below.
AC system
1) Switch the power supply ON.
2) Set the CPU module to RUN.
3) Switch the start switch ON.
4) The output devices are driven in accordance with the
program when the magnetic contactor (MC) comes ON.
System design circuit example
DC power supply
established signal
input
Start/stop circuit
Ym
Can be started by
turning ON of RA1,
which is the PLC's RUN
Yn
output.
MC
Output for warning
(lamp or buzzer)
L
Turned ON in RUN
status by SM403
RA1
MC
Switches the power
supply to output devices
OFF when the system
stops:
MC1
At emergency stops
At stops on reaching a limit
MC2
Interlock circuit
Constructs external interlock
circuits for opposing
operations such as forward
and reverse rotation, and
parts that could cause
machine damage or accidents.
AC/DC system
Power supply
Transformer
Fuse
CPU module
SM52
Ym
SM403
Yn
XM
TM
TM
MC1 N0 M10
M10
N0
Start Program
switch
RA1
MC
MC
Stop
switch
Input module
RA2
Output module
Ym
L
Y n
RA1
Output module
MC2
MC1
MC1
MC2
AC/DC system
1) Switch the power supply ON.
2) Set the CPU module to RUN.
3) Switch RA2 ON when the DC power supply starts.
4) Set the timer (TM) to "ON" upon 100% establishment of DC power
supply.
(The set value for TM shall be the period from turning "ON"RA2 to
100% establishment of DC power supply.Set 0.5 seconds for it.)
5) Switch the start switch ON.
6) The output devices are driven in accordance with the program
when the magnetic contactor (MC) comes ON.
(When a voltage relay is used for RA2, the timer in the program
(TM) is not necessary.)
19 - 4
DC power
supply
( + )( - )
Fuse
The setting for TM
is the time taken
to establish the
DC input signal.
Voltage relay
recommended
RA2
XM
Output for warning
(lamp or buzzer)
Turned ON in RUN
status by SM403
MC MC
Switches the power
supply to output
devices OFF when
the system stops:
At emergency stops
At stops on reaching a limit