Omron CJ2 User Manual page 121

Electrical Diagram
MCB1
MCB2
Interlock Circuits
When the PLC controls an operation such as the clockwise and counterclockwise operation of a motor,
provide an external interlock such as the one shown in the following example to prevent both the for-
ward and reverse outputs from turning ON at the same time.
000501
CJ-series
PLC
000502
This circuit prevents outputs MC1 and MC2 from both being ON at the same time even if both
CIO 000501 and CIO 000502 are ON, so the motor is protected even if the PLC is programmed improp-
erly or malfunctions.
CJ2 CPU Unit Hardware User's Manual
Power supply
CR1
Controlled system
Transformer
or noise filter
Twisted-pair wires
DC voltage
regulator
PLC RUN
output
Surge suppressor
CR1
Interlock circuit
MC2
MC1
Motor clockwise
MC1
MC2 Motor counterclockwise
CJ-series
PLC
DC
input/output
5 Installation
5
5-3