National Instruments Fieldbus User Manual
Page 23
Appendix B
Troubleshooting
© National Instruments Corporation
B-3
Caution
Do not power down the FBUS-HSE/H1 LD while the PROCESS LED is lit.
The green PROCESS LED is lit when you update the nonvolatile flash
memory of the FBUS-HSE/H1 LD. If you want to change network settings,
save channel settings or power-up values, or upgrade its firmware, you need
to update the nonvolatile flash memory.
The red Ethernet STATUS LED is lit when the FBUS-HSE/H1 LD detects
an error. The FBUS-HSE/H1 LD indicates specific error conditions by
flashing STATUS LED a specific number of times. Table B-1 describes the
STATUS LED flashing sequences and the corresponding error conditions.
The green TX LED is lit when the FBUS-HSE/H1 LD transmits data over
the Ethernet.
The green RX LED is lit when the FBUS-HSE/H1 LD receives data from
the Ethernet. Because of unrelated network traffic, this LED blinks
occasionally even when the FBUS-HSE/H1 LD is inactive.
The green LINK LED is lit when the FBUS-HSE/H1 LD is connected to
an active Ethernet segment.