Omron CP1H CPU UNITS - PROGRAMMING 05-2007, Operation Manual

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Troubleshooting Section 11-2
11-2-1 Error Processing Flowchart
Confirm the error category by referring to the status of the CPU Unit indicators
and the 7-segment display, investigate the cause for the error in the error
tables, and take corrective actions.
11-2-2 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.
■
CPU Standby
Detection of Special I/O Units and CPU Bus Units has not been completed.
• If a CPU Bus Unit has not started normally, check the Unit Setup.
• If a Special I/O Unit is not detected, replace the Special I/O Unit.
Error occurred.
POWER indicator lit?
RUN indicator lit?
ERR/ALM indicator lit?
Information on
7-segment display?
There is no error
in the CP1H.
Check for other
causes (section
11-3).
Check the power supply
(sections 11-2-2 and 11-3).
ERR/ALM indicator lit?
A CPU standby
error has
occurred.
Refer to
section 11-2-2.
A non-fatal error has occurred.
Refer to section 11-2-5.
A fatal error has occurred.
Refer to section 11-2-3.
A CPU error has occurred.
Refer to section 11-2-4.
Lit
Not lit
The display is not
lit or is frozen.
Not lit
The display is
being updated.
Not lit
Flashing
Not lit
Lit
Not lit
Lit
The display is
being updated.
Information on
7-segment display?