ABB IRB 6400R Product On-Line Manual page 326

Troubleshooting Tools
LAN
TXD RXD
CAN
NS MS
A
U
I
DSQC
336
F
T
P
E
C
O
N
S
O
L
E
16
2.5 Ethernet DSQC 336
Designation
TxD
RxD
NS
MS
F
Colour Description/Remedy
Yellow Indicates data transmit activity.
If no light when transmission is
expected, check error messages and
check also system boards in rack.
Yellow Indicates data receive activity.
If no light, check network and
connections.
Green/red See section 2.14.
Green/red See section 2.14.
Red Lit after reset. Thereafter controlled
by the CPU.
Light without message on display
indicates a hardware fault preventing
system from strating.
By light and message on display, check
message.
Product Manual