1-7
1 Overview of Errors
NJ-series Troubleshooting Manual (W503)
1-3 Non-fatal Errors
1
1-3-1 Types of Non-fatal Errors
• Observations
These errors do not affect the control operations of the Controller. The observation notifies you of
potential problems before they develop into a minor fault level error or worse.
• Information
Events that are classified as information provide information that do not indicate errors.
You can change the event level for some events. Refer to the NJ-series CPU Unit Software User’s Man-
ual (Cat. No. W501) for details on changing event levels. Refer to 3-1 Errors by Source in this manual to
see the events for which you can change the event level.
Operation for Each Level
The way that the Controller operates when an event occurs depends on the level of the Controller
event.
Event level
Item
Controller errors
Controller
information
Major fault
level
Partial fault
level
Minor fault
level
Observation Information
Definition
These errors
are serious
errors that pre-
vent control
operations for
the entire Con-
troller.
These errors
prevent all of
the control in a
function mod-
ule other than
PLC Function
Module.
These errors
prevent part of
the control
operations in a
certain func-
tion module.
These errors
do not affect
system control
operations.
These are not
errors, but
appear in the
event log to
notify the user
of specific
information.
Event examples
(Only a few exam-
ples are provided
here. Refer to Sec-
tion 3 Error Tables
for a list of all of
the errors.
• I/O Bus
Check Error
(PLC Func-
tion Module)
• Motion Con-
trol Period
Exceeded
(Motion Con-
trol Function
Module)
• Communica-
tions Control-
ler Failure
(EtherCAT
Master Func-
tion Module)
• Positive Limit
Input
Detected
(Motion Con-
trol Function
Module)
• Analog Input
Disconnec-
tion Detected
(CJ-series
Unit)
• Low Battery
Voltage (PLC
Function
Module)
• Packet Dis-
carded Due
to Full
Reception
Buffer (Eth-
erNet/IP
Function
Module)
• Power
Tur ned ON
• Power Inter-
rupted
• Memory All
Cleared
Front-
panel
indica-
tors
*1
PWR
(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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