Omron CQM1H - 08-2005 Operation Manual page 128

Fail-safe Circuits
Interlock Circuits
as a RUN output. Connect an external relay (CR1) to this RUN output as
shown in the following diagram.
Note Use the Always ON Flag (SR 25213) as an execution condition for an Output
from the Output Unit.
MCB1
MCB2
Transformer
or noise filter
When the PC controls an operation such as the clockwise and counterclock-
wise operation of a motor, provide an external interlock such as the one
shown below to prevent both the forward and reverse outputs from turning ON
at the same time.
10001
PC
10002
This circuit prevents outputs MC1 and MC2 from both being ON at the same
time even if IR 10001 and IR 10002 are both ON, so the motor is protected
even if the PC is programmed improperly or malfunctions.
Power supply
CR1
Controlled system
CQM1H PC
Twisted pair
DC voltage
regulator
ON during
operation
CR1 Surge suppressor
Interlock circuit
MC2
MC1
Section 4-1
+
DC
input/output
–
MC1 Motor clockwise
MC2 Motor counterclockwise
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