Non-Cpu Unit Errors And Remedies; Error Causes And Remedies - Omron CJ2 CPU UNIT User Manual

6 Troubleshooting
6-3

Non-CPU Unit Errors and Remedies

6-3-1

Error Causes and Remedies

Input Units
No.
1 Not all inputs turn ON or indica-
tors are not lit.
2 Not all inputs turn ON (indicator
lit).
3 Not all inputs turn OFF.
4 Specific bit does not turn ON.
5 Specific bit does not turn OFF.
6 Input irregularly turns ON/OFF.
6-28
Symptom
Power is not supplied to Input
Unit.
Supply voltage is low.
Terminal block mounting screws
are loose.
Faulty contact of terminal block
connector.
Input circuit is faulty.
Input circuit is faulty.
Input device is faulty.
Input wiring disconnected.
Terminal block screws are loose.
Faulty terminal block connector
contact.
Too short ON time of external
input.
Faulty input circuit
Input bit number is used for out-
put instruction.
Input circuit is faulty.
Input bit number is used for out-
put instruction.
External input voltage is low or
unstable.
Malfunction due to noise.
Terminal block screws are loose.
Faulty terminal block connector
contact.
Cause
Supply the appropriate external
input power.
Adjust supply voltage to within
rated range.
Tighten screws.
Replace terminal block connec-
tor.
Replace Unit.
Replace Unit.
Replace input devices.
Check input wiring
Tighten screws.
Replace terminal block connec-
tor.
Adjust input device.
Replace Unit.
Correct program.
Replace Unit.
Correct program.
Adjust external input voltage to
within rated range.
Take protective measures
against noise, such as:
• Install surge suppressor.
• Install insulation transformer.
• Install shielded cables between
the Input Unit and the loads.
Tighten screws.
Replace terminal block connec-
tor.
CJ2 CPU Unit Hardware User's Manual
Remedy