Chapter 3
Feature Descriptions
cFP-21xx and cFP-BP-x User Manual
3-4
ni.com
100 Mbps LED
The green
100 Mbps
LED is lit when the cFP-21
xx
is communicating
at 100 megabits per second. If the
100 Mbps
LED is not lit, the cFP-21
xx
is communicating at 10 megabits per second.
User-Configurable LEDs A–D
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 cFP-21
xx
runs a power-on self test (POST) at power-up to verify its
operational status. The test takes several seconds, does not affect the
operation of the network, and does not affect any of the field wiring on
connector blocks installed on the backplane.
If the power-on self test fails, the cFP-21
xx
does not participate in network
communication, eliminating potential conflicts with other controllers on
the network.
When you power up the cFP-21
xx
and it has already been configured for
use, the
POWER
and
STATUS
LEDs turn on for about five seconds, then
the
STATUS
LED turns off. When the I/O module
READY
LEDs turn on,
the controller is ready for use.
The cFP-21
xx
indicates POST failure through the
STATUS
LED. If the
LEDs do not follow the sequence described here, refer to the
section of Appendix A,
, for information
about possible reasons.
