Omron CJ2 User Manual

6-27
6 Troubleshooting
CJ2 CPU Unit Hardware User’s Manual
6-3 Non-CPU Unit Errors and Remedies
6
6-3-1 Error Causes and Remedies
7 Error occurs in units of 8 points
or 16 points, i.e., for the same
common.
Common terminal screws are
loose.
Tighten screws.
Faulty terminal block connector
contact.
Replace terminal block connec-
tor.
Faulty data bus Replace Unit.
Faulty CPU Replace CPU.
8 Input indicator is not lit in normal
operation.
Faulty indicator or indicator cir-
cuit.
Replace Unit.
Output Units
No. Symptom Cause Remedy
1 Not all outputs turn ON. Load is not supplied with power. Supply power.
Load voltage is low. Adjust voltage to within rated
range.
Terminal block screws are loose. Tighten screws.
Faulty terminal block connector
contact.
Replace terminal block connec-
tor.
An overcurrent (possibly caused
by a short at the load) resulted in
a blown fuse in the Output Unit.
(Some Output Units provide an
indicator for blown fuses.)
Replace fuse.
Faulty I/O bus connector contact. Replace Unit.
Output circuit is faulty. Replace Unit.
If the INH indicator is lit, the Out-
put OFF Bit (A500.15) is ON.
Turn A500.15 OFF.
2 Not all outputs turn OFF. Output circuit is faulty. Replace Unit.
3 Output of a specific bit number
does not turn ON or indicator is
not lit.
Output ON time too short
because of a mistake in program-
ming.
Correct program to increase the
time that the output is ON.
Bit status controlled by multiple
instructions.
Correct program so that each
output bit is controlled by only
one instruction.
Faulty output circuit. Replace Unit.
4 Output of a specific bit number
does not turn ON (indicator lit).
Faulty output device. Replace output device.
Break in output wiring. Check output wiring.
Loose terminal block screws. Tighten screws.
Faulty terminal block connector
contact.
Replace terminal block connec-
tor.
Faulty output bit on a Relay Out-
put Unit.
Replace relay.
Faulty output circuit. Replace Unit.
5 Output of a specific bit number
does not turn OFF (indicator is
not lit).
Faulty output bit (Relay Output
Units only)
Replace relay.
Bit does not turn OFF due to
leakage current or residual volt-
age.
Replace external load or add
dummy resistor.
6 Output of a specific bit number
does not turn OFF (indicator lit).
Bit status controlled by multiple
instructions.
Correct program.
Faulty output circuit. Replace Unit.
No. Symptom Cause Remedy

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)