Omron CJ2 User Manual

5-3
5 Installation
CJ2 CPU Unit Hardware User’s Manual
5-1 Fail-safe Circuits
5
z Electrical Diagram
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.
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.
Interlock Circuits
MCB1
MCB2
CR1
CR1
DC
PLC RUN
output
input/output
Power supply
Controlled system
DC voltage
regulator
Surge suppressor
Twisted-pair wires
Transformer
or noise filter
CJ-series
PLC
CJ-series
PLC
MC2
000501
MC1
000502
MC1
MC2
Interlock circuit
Motor clockwise
Motor counterclockwise

Omron CJ2 Specifications

General

Model	CJ2
Manufacturer	Omron
Type	Programmable Logic Controller (PLC)
CPU Units	Multiple models available (e.g., CJ2M, CJ2H)
Number of I/O Points	Up to 2, 560 points
Communication Ports	Ethernet/IP, EtherCAT, USB, Serial
Expansion	Yes, via I/O Units and Special I/O Units
I/O Control Method	Cyclic Scan, Interrupt
Programming Language	Ladder diagram, structured text, function block diagram, sequential function chart, instruction list
Built-in I/O	Available on some models (e.g., CJ2M)
Ethernet Port	Yes, 1 port (depending on CPU Unit)
Serial Ports	RS-232C, RS-422/485 (configurable)
USB Port	Yes (for programming and monitoring)
Operating Temperature	0°C to 55°C
Storage Temperature	-25 to 70°C
Humidity	10 to 95% RH (non-condensing)
Vibration Resistance	10 to 57 Hz, Amplitude: 0.075 mm, 57 to 150 Hz, Acceleration: 1 G, X, Y, and Z directions, 80 min each
Power Supply Voltage	24 VDC or 100 to 240 VAC (depending on CPU Unit)