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Troubleshooting Section 10-2
10-2 Troubleshooting
Use the following procedure to check error details and remove the cause of
the error if the CPU Unit does not operate when the power supply is ON, oper-
ation suddenly stops and the error indicator (ERR/ALM indicator) lights, or if
the error indicator (ERR/ALM indicator) flashes during operating.
10-2-1 Error Processing Flowchart
Confirm the error category by referring to the status of the CPU Unit indica-
tors, investigate the cause for the error in the error tables, and take corrective
actions.
10-2-2 No Operation When Power Is Supplied
First confirm that the POWER indicator (green) is lit.
POWER Indicator Not Lit
The power supply may not match the Unit rating, wiring may not be correct, or
the Unit may be faulty.
1,2,3...
1. Confirm the Unit rating (i.e., is it 24 VDC or 100 to 240 VAC?) and see if
the supply power matches the rating.
2. Check the wiring to see if it is correct and that nothing is disconnected.
3. Check the voltage at the power supply terminals. If the voltage is normal
and the POWER indicator is lit, the Unit may be faulty. In that case, replace
the Unit.
POWER Indicator Turns OFF and ON
There may be fluctuations in the power supply voltage, disconnected wiring,
or poor contacts. Check the power supply system and wiring.
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.
Error occurred.
POWER indicator lit?
RUN indicator lit?
ERR/ALM indicator lit?
There is no error in the
CP1H.
Check for other causes
(section 9-3).
Check the power supply
(sections 9-2-2 and 9-3).
ERR/ALM indicator lit?
A non-fatal error has occurred.
Refer to section 9-2-5.
A fatal error has occurred.
Refer to section 9-2-3.
Lit
Not lit
Not lit
Flashing
Not lit
Lit
Not lit
Lit
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