Omron NX-PA Series User Manual page 78

3 Configuration Units
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 cor-
rupted, 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 sta-
tus of the CPU Unit.
 Indicators at the Bottom
Built-in
EtherNet/IP port
indicators
These indicators show the operation status of the built-in ports of the CPU Unit.
Port 1 and port 2 are the indicators for the built-in EtherNet/IP ports, while port 3 is the indicators for
the built-in EtherCAT port.
• Built-in EtherNet/IP Ports (Port 1 and Port 2) Indicators
Indicator Color
NET RUN Green
3 - 6
PORT1
EtherNet/IP
NET RUN
NET ERR
LINK/ACT
PORT2 PORT3
EtherNet/IP EtherCAT
NET RUN NET RUN
NET ERR NET ERR
LINK/ACT LINK/ACT
Status
Not lit. You cannot perform Ethernet communications.
• The power supply is OFF or the CPU Unit was reset.
• A MAC address error or communications Controller error
occurred.
Flashing Ethernet communications are in progress.
• Tag data link connection establishment in progress.
• IP address acquisition with BOOTP in progress.
Lit. Normal startup status.
Built-in
EtherCAT port
indicators
Meaning
NX-series CPU Unit Hardware User's Manual (W535)