1-6
Table 1-2
Description of the device status LEDs
LED
Status
Description
OFF
No power input or the MPU is faulty.
Slow blinking (1 Hz)
The MPU is operating normally.
Fast blinking (8 Hz)
The application software is being loaded (in this state, never
power off the device or hot-swap the MPU; otherwise the
MPU may be damaged), or the MPU is not working.
RUN (green)
Reset
The RUN LED goes off after the system is reset and flashes
fast on system startup.
OFF
The MPU is in the standby state or there is no power input.
ACT (yellow)
ON
The MPU is in the active state.
OFF
The system is operating normally with no alarms.
ON
A fault has occurred to the system. In this state, check the
system log immediately.
ALM (red)
Fast blinking (8 Hz)
A critical fault has occurred to the system. In this state,
handle the fault immediately.
2) Management Ethernet port/HA port LEDs
Table 1-3
Description of the management Ethernet port/HA port LEDs
LED
Status
Description
OFF
No link is present on the port.
LINK (green)
ON
A link is present on the port.
OFF
No data is being transmitted or received on the port.
ACT (yellow)
ON
Data is being transmitted or received on the port.
3) USB interface LED
Table 1-4
Description of the USB interface LED
LED
Status
Description
OFF
No host is connected to the device-mode USB interface.
ON
A host is in connection with the device-mode USB interface. The
USB cable can be unplugged in this state.
USB (green)
Blinking
Data is being transmitted or received through the device-mode
USB interface. Do not unplug the USB cable in this state.
USB interfaces are reserved for future use.