Chapter 2
Hardware Overview
©
National Instruments Corporation
2-15
NI 951x User Manual
LED Indicators
The NI 951x has four LEDs to display status information.
Axis Status
The Axis Status LED (green) has three states to display axis status.
•
Off
—The module is in sleep mode or failed to boot correctly. Refer to
the
NI SoftMotion Module
book of the
LabVIEW Help
for
troubleshooting information.
•
Flashing
—The module booted up correctly and is functional.
•
Lit
—The module is functional and the drive enable output is active.
Encoder Active
The Encoder Active LED (green) has three states for encoder and V
sup
status.
•
Off
—The power supply (V
sup
) is not connected. You must connect a
power supply to receive encoder pulses.
•
Flashing
—The power supply (V
sup
) is connected and the module is
receiving encoder pulses.
Note
The LED flash rate does not correspond to the rate at which the module receives
encoder pulses. For the NI 9516 module, the encoder LED flashes when pulses are received
on either Encoder 0 or Encoder 1.
•
Lit
—The power supply (V
sup
) is connected but the module is not
receiving encoder pulses.
1
Axi
s
S
t
a
t
us
(Green)
2
Encoder Active (Green)
3
Limit Active (Yellow)
4
Axi
s
F
au
lt (Red)
1
2
3
4