Error Processing Flowchart; No Operation When Power Is Supplied - Omron CP1H CPU Operation Manual

Troubleshooting

11-2-1 Error Processing Flowchart

Error occurred.
POWER indicator lit?
Lit
RUN indicator lit?
Lit
ERR/ALM indicator lit?
Flashing
Information on
7-segment display?
The display is
being updated.
A non-fatal error has occurred.
Refer to section 11-2-5.

11-2-2 No Operation When Power Is Supplied

POWER Indicator Not Lit
1,2,3...
POWER Indicator Turns OFF and ON
POWER Indicator Lit but No Operation
580
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.
Not lit
Not lit
Not lit
Not lit
There is no error A CPU standby
in the CP1H. error has
Check for other occurred.
causes (section Refer to
11-3). section 11-2-2.
First confirm that the POWER indicator (green) is lit.
The power supply may not match the Unit rating, wiring may not be correct, or
the Unit may be faulty.
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.
There may be fluctuations in the power supply voltage, disconnected wiring,
or poor contacts. Check the power supply system and wiring.
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.
Check the power supply
(sections 11-2-2 and 11-3).
ERR/ALM indicator lit?
Not lit
Lit
Information on
7-segment display?
The display is
being updated.
A fatal error has occurred.
Refer to section 11-2-3.
Section 11-2
The display is not
lit or is frozen.
A CPU error has occurred.
Refer to section 11-2-4.