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6 Troubleshooting
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
6-1 Operation after an Error
6
6-1-3 Non-fatal Errors in the CPU Unit
• Information
Events that are classified as information do not indicate errors.
You can change the event level for some events. Refer to NJ/NX-series CPU Unit Software User’s
Manual (Cat. No. W501) for information on changing event levels. Refer to 6-2 Troubleshooting in this
manual to see the events for which you can change the event level.
Operation for Each Level
The operation that is performed when an error occurs depends on the error level of the Controller
event.
Item
Event level
Controller errors
Controller infor-
mation
Major fault level Partial fault level Minor fault level Observation Information
Definition
These errors are
serious errors
that prevent con-
trol operations
for the entire
Controller.
These errors pre-
vent all of the
control in a func-
tion module other
than PLC Func-
tion Module.
Errors that pre-
vent a portion of
control in one of
the function
modules.
Errors that do
not affect control.
Information level
events are not
errors, but infor-
mation provided
to the user in the
event log.
Event examples (Only a
few examples are pro-
vided here.
Refer to the NJ/NX-
series Troubleshooting
Manual (Cat. No. W503)
for a complete list of
errors.)
• Non-volatile
Memory Data
Corrupted
(PLC Func-
tion)
• Motion Control
Period
Exceeded
(Motion Con-
trol Function
Module)
• Communica-
tions Controller
Error (Ether-
CAT Master
Function Mod-
ule)
• Positive Limit
Input Detected
(Motion Con-
trol Function
Module)
• Low Battery
Voltage (PLC
Function Mod-
ule)
• Packet Dis-
carded Due to
Full Receive
Buffer (Ether-
Net/IP Func-
tion Module)
• Power Turned
ON
• Power Inter-
rupted
• Memory All
Cleared
Front-
panel indi-
cators
*1
POWER
(green)
Lit. Lit. Lit. Lit. Lit.
RUN
(green)
Not lit. Lit. Lit. Lit. Lit.
ERROR
(red)
Lit. Flashes at 1-s
intervals.
Flashes at 1-s
intervals.
Not lit. Not lit.
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