Omron CJ2 User Manual

7-7
7 Inspection and Maintenance
CJ2 CPU Unit Hardware User’s Manual
7-2 Replacing the Battery
7
7-2-1 Battery Replacement
Additional Information
If power is not turned ON for at least five minutes before replacing the battery, the capacitor that
backs up memory when the battery is removed will not be fully charged and memory may be lost
before the new battery is inserted.
2. Open the compartment on the upper left of the CPU Unit and carefully draw out the battery.
Precautions for Safe Use
• You must complete this procedure within five minutes at 25°C after turning OFF the power to
the CPU Unit to ensure memory backup. Data may be lost if more than five minutes is
required.
• Never short-circuit the battery terminals; never charge the battery; never disassemble the bat-
tery; and never heat or incinerate the battery. Doing any of these may cause the battery to
leak, burn, or rupturing resulting in injury, fire, and possible loss of life or property. Also, never
use a battery that has been dropped on the floor or otherwise subject to shock. It may leak.
• UL standards require that batteries be replaced by experienced technicians. Always place an
experienced technician in charge or battery replacement.
• Turn ON the power after replacing the battery for a CPU Unit that has been unused for a long
time. Leaving the CPU Unit unused again without turning ON the power even once after the
battery is replaced may result in a shorter battery life.
Additional Information
The battery error will be cleared automatically the next time the CPU Unit is turned ON after
replacing the Battery.

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)