6-7
6 Troubleshooting
CP1E CPU Unit Hardware User’s Manual(W479)
6-1 Troubleshooting CPU Unit Errors
6
6-1-7 No Operation When Power Is Supplied
First confirm that the POWER indicator (green) is lit.
z POWER Indicator Not Lit
The power supply may not match the Unit rating, wiring may not be correct, or the Unit may be faulty.
• Confirm the Unit rating (i.e., is it 24 VDC or 100 to 240 VAC?) and see if the supply power
matches the rating.
• Check the wiring to see if it is correct and that nothing is disconnected.
• Check the voltage at the power supply terminals. If the voltage is normal and the POWER indica-
tor is not lit, the Unit may be faulty. In that case, replace the Unit.
z POWER Indicator Flashing
There may be fluctuations in the power supply voltage, disconnected wiring, or poor contacts. Check
the power supply system and wiring.
z POWER Indicator Lit but No Operation
Check the RUN indicator if the POWER indicator is lit but the CPU Unit does not operate.
The CPU Unit may be on standby if the RUN indicator is not lit.
z CPU Unit Indicators
: Not lit : Flashing : Lit
There may be a CPU error or a fatal error if operation stops (i.e., the RUN indicator turns OFF) and
the ERR/ALM indicator lights.
Data on fatal errors is displayed on the Errors Tab Page of the CX-Programmer’s PLC Errors Win-
dow.
Take corrective actions after checking error details based on the CX-Programmer display message
together with the Auxiliary Area Error Flags and error information.
• Errors are listed in order with the most serious errors first.
• If two or more errors occur at the same time, the most serious error code will be stored in
A400.
• If the IOM Hold Bit hasn’t been turned ON to protect I/O memory, all non-retained areas of I/O
memory will be cleared when a fatal error other than FALS occurs.
• I/O memory will be held when the I/O Memory Hold Bit is ON, but outputs will be turned OFF.
6-1-7 No Operation When Power Is Supplied
6-1-8 Fatal Errors
POWER
RUN
INH
PRPHL
BKUP
ERR/AL
—: Irrelevant
POWER
RUN
ERR/ALM
INH
PRPHL
BKUP
—
—
—
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