5-5
5 Troubleshooting
NJ-series CPU Unit Hardware User’s Manual (W500)
5-1 Operation after an Error
5
5-1-3 Non-fatal error in CPU Unit
*1 If multiple Controller errors have occurred, the indicators show the error with the highest error level.
*2 Operation stops in the function module (Motion Control Function Module, EtherCAT Master Function Module, or Ether-
Net/IP Function Module) in which the error occurred.
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
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.
Operation
of NJ-
series CPU
Unit
RUN out-
put on
Power
Supply
Unit
OFF ON ON ON ON
User pro-
gram exe-
cution
status
Stops.
Continues.
*2
Continues. Continues. Continues.
Outputs
turned OFF
Yes N o No No No
Error reset
Not possible. Depends on the
nature of the
error.
Depends on the
nature of the
error.
--- ---
Event logs
Recorded.
(Some errors are
not recorded.)
Recorded. Recorded. Recorded. Recorded.
Outputs from EtherCAT
slaves and Basic Out-
put Units
Refer to I/O
Operation for
Major Fault
Level Controller
Errors on page
5-6.
• Errors in Ether-
CAT Master
Function Mod-
ule: Depends
on settings in
the slave.
• Errors in other
function mod-
ules: Depends
on user pro-
gram.
Depends on the
user program.
Depends on the
user program.
Depends on the
user program.
Sysmac Studio display
(while online)
Error messages are automatically displayed. You can
display detailed information in the Troubleshooting Dia-
log Box.
These items are not displayed in the
error display in the Controller Status
Pane.
Item
Event level
Controller errors
Controller infor-
mation
Major fault level Partial fault level Minor fault level Observation Information
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