1 Overview of Errors
1-6
NJ-series Troubleshooting Manual (W503)
Sources of Controller Events
The Event source information indicates the location where an event occurred. The event source
identifies the particular function module in the CPU Unit in which the event occurred. For some func-
tion modules, there is more detailed information about the event source. This information is called
the Source details. The following information is provided as the event source details.
The event source is displayed on the Sysmac Studio or NS-series PT.
Levels of Controller Events (Errors and Information)
The following table classifies the levels of Controller events according to the effect that the errors
have on control.
Errors with a higher level have a greater impact on the functions that the NJ-series Controller pro-
vides, and are more difficult to recover from. When an event occurs, the Sysmac Studio or PT will
display the level.
Event Levels
• Major Fault Level
These errors prevent control operations for the entire Controller. When the CPU Unit detects a
major fault, it immediately stops the execution of the user program and turns OFF the loads of all
slave, including remote I/O. With EtherCAT slaves and some CJ-series Special Units, you can set
the slave settings or Unit settings to select whether outputs will go OFF or retain their previous
status. You cannot reset major fault level errors from the user program, the Sysmac Studio or an
NS-series PT. To recover from a major fault level error, remove the cause of the error, and either
cycle the power supply to the Controller, or reset the Controller from the Sysmac Studio.
• Partial Fault Level
These errors prevent control operations in a certain function module in the Controller. The NJ-
series CPU Unit continues to execute the user program even after a partial fault level error occurs.
You can include error processing in the user program in order to stop equipment safely. After you
remove the cause of the error, execute one of the following to return to normal status.
• Reset the error from the user program, the Sysmac Studio, or an NS-series PT.
• Cycle the power supply.
• Reset the Controller from the Sysmac Studio.
• Minor Fault Level
These errors prevent part of the control operations in a certain function module in the Controller.
The troubleshooting for minor fault level errors is the same as the processing for partial fault level
errors.
Details on Controller Events (Errors and Information)
Event source Source details
PLC Function Module Instructions, I/O bus master, or CJ-series Unit
Motion Control Function Module Common, axis, or axes group
EtherCAT Master Function Module Communications port, EtherCAT master, EtherCAT Coupler
Unit, NX Unit, or EtherCAT slave
EtherNet/IP Function Module Communicatio n s po r t , C I P, F TP, NT P, o r S NMP
No. Level Classification Level name
1 High Controller errors Major fault level
2 Partial fault level
3Minor fault level
4 Observation
5 Low Controller informa-
tion
Information
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