Precautions for Safe Use
• Never turn OFF the power supply to the Controller when the BUSY indicator is flashing. 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. Also, a major fault level Controller error will occur the next time you start opera-
tion, 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 the SD
Memory Card from the CPU Unit while the power supply is ON, press the SD Memory Card
power supply switch and wait for the SD BUSY indicator and 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 CPU Unit status indicators (POWER,
RUN, and ERROR indicators).
Refer to the NJ/NX-series Troubleshooting Manual (Cat. No. W503) for the procedures to check the
operation status of the CPU Unit
.
3 Configuration Units
3-9
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
3-1 CPU Units
3
3-1-3 Operation Status Indicators
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