Omron NJ Series Troubleshooting Manual page 32

1 Overview of Errors
Details on Controller Events (Errors and Information)
 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.
Event source
PLC Function Module
Motion Control Function Module
EtherCAT Master Function Module
EtherNet/IP Function Module
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.
No. Level
1
2
3
4
5
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.
• 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.
1-6
Classification
High Controller errors
Low Controller informa-
tion
Source details
Instructions, I/O bus master, or CJ-series Unit
Common, axis, or axes group
Communications port, EtherCAT master, or EtherCAT slave
Communications port, CIP, FTP, NTP, or SNMP
Level name
Major fault level
Partial fault level
Minor fault level
Observation
Information
NJ-series Troubleshooting Manual (W503)