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