24
(1) System design circuit example
Interlock circuit
Constructs external
interlock circuits for
opposing operations
such as forward and
reverse rotation, and
parts that could cause
machine damage or
accidents.
Switches the power
supply to output devices
OFF when the system
stops:
At emergency stops
At stops on reaching a
limit
Power supply
Power supply
Switches the power
supply to output
devices OFF when
the system stops:
Output for warning
(lamp or buzzer)
Turned ON in RUN
status by SM403
The setting for TM
is the time taken
to establish the
DC input signal.
Output for warning
(lamp or buzzer)
Turned ON in RUN
status by SM403
Fuse
Transformer
Fuse
Transformer
AC system
AC/DC system
CPU module
SM52
SM403
Ym
Yn
Start/stop circuit
Can be started
by turning ON of
RA1, which is the
programmable
controller's RUN
output.
DC power supply
established signal
input
CPU module
SM52
SM403
XM
Ym
Yn
TM
DC power
supply
(
+
)(
−
)
Fuse
TM
M10
N0
Program
Start
switch
MC
MC1 N0 M10
XM
RA2
Ym
Yn
Output unit
MC1
MC2
MC1
MC2
L
RA1
MC MC
MC
RA1
Start
switch
MC Stop
switch
Input unit
Output unit
Ym
Yn
MC
MC
L
RA1
MC2
MC1
MC1
MC2
RA1
MC
RA2
Output module
Voltage relay
recommended
Output unit
Stop
switch
At emergency stops
At stops on reaching
a limit
Input unit
Program
Y1
SM1084
XM
RA2
XM
Y1
RA2
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 program when the
magnetic contactor (MC) turns ON.
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] Switch the timer (TM) ON when the DC power supply
reaches working voltage. (The set value for TM must
be the time it takes for 100% establishment of the DC
power after RA2 is switched ON. Make this set value
0.5 seconds.)
[5] Switch the start switch ON.
[6] The output devices are driven in accordance with the
program when the magnetic contactor (MC) comes ON.
(If a voltage relay is used at RA2, no timer (TM) is
necessary in the program.)