Omron CJ2 User Manual

5-33
5 Installation
CJ2 CPU Unit Hardware User’s Manual
5-3 Wiring
5
5-3-5 Connecting I/O Devices
z AC Input Units
Precautions for Safe Use
When using a reed switch as the input contact for an AC Input Unit, use a switch with an allow-
able current of 1 A or greater. If reed switches with smaller allowable currents are used, the con-
tacts may fuse due to surge currents.
z Precautions when Connecting a Two-wire DC Sensor
When using a two-wire sensor with a 12-VDC or 24-VDC input device, check that the following con-
ditions have been met. Failure to meet these conditions may result in operating errors.
• Relation between voltage when the PLC is ON and the sensor residual voltage:
V
ON
≤ V
CC
− V
R
• Relation between voltage when the PLC is ON and sensor control output (load current):
I
OUT
(min) ≤ I
ON
≤ I
OUT
(max.)
I
ON
= (V
CC
− V
R
− 1.5 [PLC internal residual voltage])/R
IN
When I
ON
is smaller than I
OUT
(min), connect a bleeder resistor R. The bleeder resistor constant
can be calculated as follows:
R ≤ (V
CC
− V
R
)/(I
OUT
(min.) − I
ON
)
Power W ≥ (V
CC
− V
R
)
2
/R × 4 [allowable margin]
V
CC
: Power voltage
V
R
: Sensor output residual current
I
ON
: PLC ON current
I
OUT
: Sensor control current (load current)
R
IN
: PLC input impedance
COM
IN
AC Input Unit
Contact output
AC Switching
Proximity
switch
main
circuit
COM
IN
AC Input Unit

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)