Omron NX Series User Manual page 80

3 Configuration Units
Indicator
ERROR
BUSY
SD PWR
SD
BUSY
*1. Refer to the NJ/NX-series CPU Unit Software User's Manual (Cat. No. W501) for details on backing up
data.
Precautions for Safe Use
• Do not turn OFF the power supply to the Controller while the BUSY indicator flashes. While
the BUSY indicator is lit, the user program and settings in the CPU Unit are being backed up
in the built-in non-volatile memory. The data will not be backed up if the power supply is
turned OFF. The next time that the Controller is started, a Controller error in the major fault
level will occur and operation will stop.
• Do not turn OFF the power supply or remove the SD Memory Card while SD Memory Card
access is in progress (i.e., while the SD BUSY indicator flashes). Data may become corrupt-
ed, and the Controller will not operate correctly if it uses corrupted data. To remove an SD
Memory Card from the CPU Unit when power is supplied to the CPU Unit, press the SD
Memory Card power supply switch and wait for the SD PWR indicator to turn OFF before you
remove the SD Memory Card.
You can check the operation status of the CPU Unit with the PWR, RUN, and ERROR indicators at
the top of the front panels of the Power Supply Unit and CPU Unit.
Refer to 5-1 Overview of Troubleshooting on page 5-2 for the procedures to check the operation
status of the CPU Unit.
3-6
Color Status
Red Lit.
Flashing at 1-
s intervals.
Not lit.
Yellow Flashing
Not lit.
Green Lit.
Flashing
Not lit.
Yellow Flashing
Not lit.
Meaning
Self-diagnosis found one of the following errors.
•
Controller error in the major fault level
•
CPU error
Self-diagnosis found one of the following errors.
•
Controller error in the partial fault level (an error in which
all control of a Function Module is disabled)
•
Controller error in the minor fault level (an error in which
partial control of a Function Module is disabled)
CPU Unit operation will continue for either of these errors.
Operation will stop for the Function Module in which a Con-
troller error in the partial fault level occurred.
Operation will continue for the Function Module in which a
Controller error in the minor fault level occurred.
The CPU Unit is in normal operation, a CPU reset is in
progress, or monitored information occurred. (CPU Unit op-
eration will continue.)
Built-in non-volatile memory access in progress.
Other than the above.
Power is being supplied to the SD Memory Card and the SD
Memory Card can be used.
A backup, restore or verification operation is in progress.
The power supply for the SD Memory Card is stopped, an
SD Memory Card is not mounted, or the file format of the
mounted SD Memory Card is not supported.
SD Memory Card access in progress.
SD Memory Card access not in progress.
NX-series CPU Unit Hardware User's Manual (W535)
*1