Non-Fatal Errors In The Cpu Unit - Omron NX1P2 series User Manual

6 Troubleshooting
Checking for Fatal Errors
You can identify fatal errors based on the status of the POWER, RUN and ERROR indicators, as well
as by the ability to connect communications to the Sysmac Studio.
POWER
(green)
Not lit
Lit
Lit
Lit
* An online connection to the Sysmac Studio is necessary to differentiate between Hardware Initialization Errors,
CPU Unit Errors, and non-fatal errors in the CPU Unit. Power Supply Errors and System Initialization Errors can
be differentiated with the indicators. There is no need to see if you can go online with the CPU Unit from the Sys-
mac Studio.
6-1-3

Non-fatal Errors in the CPU Unit

Event Levels
Non-fatal errors that occur are managed as Controller events in the NX1P2 CPU Unit. Controller events
are classified into levels according to the degree of the effect that the events have on control. When an
event occurs, the Sysmac Studio or HMI will display the level. Refer to the NJ/NX-series Troubleshoot-
ing Manual (Cat. No. W503) for details on Controller events.
• Major Fault Level
These errors prevent control operations for the entire Controller. If a major fault level error is
detected, user program execution is stopped immediately and the loads for all slaves (including
remote I/O) are turned OFF. With EtherCAT slaves and some NX Units, you can set the slave set-
tings 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 HMI. To recover from a
major fault level error, remove the cause of the error, and either cycle the power supply to the Con-
troller 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 NX1P2
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 to safely stop any devices in operation. 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 HMI.
• 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. Observations serve as warnings to
the user so that the error does not develop into an error at a higher level.
6 - 4
Indicator
RUN (green) ERROR (red)
Not lit Not lit
Not lit Not lit
Not lit or Flashing (2-s Lit
intervals or 0.5-s inter-
vals)
Flashing (2-s intervals) Not lit
for 30 s or longer
Communications
with Sysmac Studio
Not possible.*
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
CPU Unit operating
status
Power Supply Error
Hardware Initialization
Error
CPU Unit Error
System Initialization
Error