Omron CJ2 User Manual

7 Inspection and Maintenance
7-6
CJ2 CPU Unit Hardware User’s Manual
If the PLC Setup has been set to detect a low-battery error, the ERR/ALM indicator on the front of the
CPU Unit will flash when the battery is nearly discharged.
If the Battery Error Flag (A402.04) is ON
*1
, first check whether the Battery is properly connected to the
CPU Unit. If the battery is properly connected, replace the battery as soon as possible.
Once a low-battery error has been detected, it will take 5 days (at an ambient temperature of 25°C
*2
)
before the battery fails assuming that power has been supplied at least once a day. Battery failure and
the resulting loss of data in RAM can be delayed by ensuring that the CPU Unit power is not turned
OFF until the battery has been replaced.
*1 The Battery Error Flag (A402.04) will turn ON only if the Detect Low Battery parameter in the PLC Setup has
been set to detect a low-battery error. If this setting has not been made, battery errors will not be detected.
*2 The battery will discharge faster at higher temperatures, e.g., 4 days at 40°C and 2 days at 55°C.
z Replacement Battery
Use the CJ1W-BAT01 Battery Set.
Precautions for Correct UsePrecautions for Correct Use
Be sure to install a replacement battery within two years of the production date shown on the
battery's label.
Use the following procedure to replace the battery when the previous battery has become completely
discharged.
Precautions for Safe Use
We recommend replacing the battery with the power OFF to prevent the CPU Unit's sensitive
internal components from being damaged by static electricity. The battery can be replaced with-
out turning OFF the power supply. To do so, always touch a grounded piece of metal to discharge
static electricity from your body before starting the procedure.
After replacing the battery, connect a Programming Device and clear the battery error.
1. Turn OFF the power to the CPU Unit.
If the CPU Unit has not been ON, turn it ON for at least five minutes and then turn it OFF.
Low Battery Indicators
Replacement Procedure
ERR/ALM
RUN
COMM
INH
PRPHL
BKUP
CJ1W-BAT01
08-06
Production Date
Manufactured in June 2008.

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)