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3 DESIGN
(b) System design circuit example(when using ERR contact of
power supply module)
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 accident if no
interlock were used.
MC
RA1
RA2
L
Ym
MC2
MC1
MC1
RA3
MC2
MC
MC1 N0 M10
ERR
RA1
Yn
START/STOP circuit
Turns output equipment
power off when ERR
switch OFF
RA3
MC
XM
M10
Program
CPU
Transformer
Fuse
Power supply
Ym
SM52
SM403
TM
XM
TM
DC power supply
established signal input
RA3 switched
OFF by ERR
Alarm output
(lamp or buzzer)
A voltage relay
is recommended
Set TM to time
to establish
DC input signal
Using AC and DC
(-)
(+)
Yn
DC power
supply
RA2
Transformer
Fuse
Fuse
Input module
Stop
switch
Start
switch
output module
output module
Power supply module
Starting possible
when the PLC RUN
output RA1 is ON
on emergency stop,
on stop at upper/lower
limit switch
MC
N0
The power-ON procedure is as follows:
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.)