Chapter 4
Feature Set Description
©
National Instruments Corporation
4-5
Appendix C,
, for more information about
STATUS
LED error indications.
LINK LED
The green
LINK
LED is lit when the FP-20
xx
is connected to a functioning
Ethernet segment.
ACTIVE LED
The green
ACTIVE
LED is lit when the FP-20
xx
receives data from or
transmits to the Ethernet. Because of unrelated network activity, this LED
blinks occasionally even when the FP-20
xx
is inactive.
100 Mbps LED
The yellow
100 Mbps
LED is lit when the FP-20
xx
is communicating at
100 megabits per second. If the
100 Mbps
LED does not light, all
communications with the FP-20
xx
will be at 10 megabits per second.
User-Configurable LEDs A–D (for Count-Output Channels 5–8)
LEDs
A
,
B
,
C
, and
D
correspond to count-output channels 5, 6, 7, and 8,
respectively, on the network module. LEDs
B
,
C
, and
D
can be sent values
of 0, 1, or 2. LED
A
should be sent only 0 or 1. LED
A
handles a 2 as a 1.
The values sent to these LEDs manifest as 0 = off, 1 = green, and 2 = red.
Power-On Self Test (POST)
The FP-20
xx
runs a power-on self test (POST) at power-up to verify its
own operational status. The test takes several seconds, does not affect the
operation of the network, and does not affect any of the field wiring
connected to the terminal bases in the bank.
If the power-on self test fails, the FP-20
xx
does not participate in network
communication, eliminating potential conflicts with the other banks in the
network.
When you power up the FP-20
xx
and it has already been configured for use,
the
POWER
and
STATUS
LEDs come on for about five seconds, then the
STATUS
LED turns off. The
A
,
B
,
C
, and
D
LEDs come on for about
15 seconds as LabVIEW RT starts up. When they turn off, the I/O module
READY
LEDs turn on and the network module is ready for use.
The FP-20
xx
indicates POST failure through the
STATUS
LED. If the
LEDs do not follow the sequence described here, refer to the