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Error Details and Measures Section 13-2
Output Power Supply Errors
Safety Input Terminal Errors
Test Output Terminal Errors
Safety Output Terminal Errors
Error name Probable cause Action
Output PS voltage
low
The correct output power is not
being supplied.
Check the following before supplying the rated power.
• Is the power supply voltage within the specifications?
• Is the wiring correct or connected properly?
• Either 24 V is not being applied to the Safety Output terminals
or the power supply positive terminal is not connected.
The Unit may have failed if the measured voltage at terminal
V2/G2 is normal. In that case, replace the Unit.
Output PS OFF cir-
cuit error
An error has been detected in the
output power supply OFF test.
Error name Probable cause Action
External test signal
failure at Safety Input
An error was detected in evaluation of Safety
Input terminals.
1. Contact of input signal lines to positive side of
power supply lines.
2. Short-circuit between input signal lines.
3. Failure of externally connected device.
1./2. Check the external wiring.
3. Replace the externally connected device.
Internal circuit error
at Safety Input
An error was detected in the internal circuits. Cycle the power supply. If the error occurs again,
replace the Unit.
Discrepancy error at
Safety Input
An error was detected in discrepancy evaluation
of Safety Input terminals.
1. Input signal line ground fault or disconnection.
2. Failure of connected device.
3. Incorrect set value for discrepancy time.
1. Check the external wiring.
2. Replace the externally connected device.
3. Review the discrepancy time.
Error name Probable cause Action
Overload detected at
Test Output
1. Output signal line ground fault
2. Failure of externally connected device.
1. Check the external wiring.
2. Replace the externally connected device.
Stuck-at-high
detected at Test Out-
put
1. Contact of output signal lines to positive side
of power supply lines.
2. Internal circuit failure
1. Check the external wiring.
2. Cycle the power supply. If the error occurs
again, replace the Unit.
Undercurrent
detected using Mut-
ing Lamp
1. Output signal line disconnection.
2. Failure of externally connected device.
1. Check the external wiring.
2. Replace the externally connected device.
Internal circuit error
at Test Output
An error was detected in the internal circuits. Cycle the power supply. If the error occurs again,
replace the Unit.
Error name Probable cause Action
Overcurrent detected
at Safety Output
Failure of an externally connected device was
detected.
Replace the externally connected device.
Short circuit
detected at Safety
Output
A ground fault in output signal lines was
detected.
Check the external wiring.
Stuck-at-high
detected at Safety
Output
1. Contact of output signal lines to positive side
of power supply lines.
2. Internal circuit failure
3. Output power supply outside of specifications.
1. Check the external wiring.
2. Cycle the power supply. If the error occurs
again, replace the Unit.
3. Check the output power supply.
Dual channel viola-
tion at Safety Output
Programming error Correct the program so that the same data is
output when the Safety Output terminals are set
to Dual-channel Mode.
Internal circuit error
at Safety Output
An error was detected in the internal circuits. Cycle the power supply. If the error occurs again,
replace the Unit.
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