Omron CJ2 User Manual page 193

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