National Instruments Module NI PXI-8250 - Manual (Page 21)

Chapter 3 Hardware Overview
© National Instruments Corporation 3-5 NI PXI-8250 User Manual
System Status LEDs
There are 6 system status LEDs to report the status of the +5 V, +3.3 V,
+12 V, and –12 V power rails, the intake temperature of the chassis, and the
overall status of the power shuttle fans of the chassis. These LEDs only
light up either red or green depending on whether the status information
shows the parameters in the specified range. The criteria for the system
status LEDs to light green is provided in Table 3-1. The acceptable range
for voltage rail data is ±5%, 0–50 °C for the intake temperature reading,
and 1500+ RPM for fan speed. Any data acquired outside of these ranges
will be reflected as a red-lit LED.
User LEDs
The 6 user LEDs are driven by implementing them in software. Refer to the
NI System Monitor 1.1 Help for more information on developing
applications for the NI PXI-8250.
Front Panel Connector
The NI PXI-8250 has one 8-pin connector on the lower section of the front
panel. The 8-pin connector provides the three connections for the relay, as
well as five connections for the fused power outputs. The three relay pins
included normally closed (NC), normally open (NO), and common (COM)
ports to the electromechanical relay. The five power output connections
include fused pins to +5V, +3.3V, +12V, –12V, and ground.
Caution Power off all devices before connecting or disconnecting the NI PXI-8250 plug.
Failure to do so may damage the module.
Table 3-1. System Status LED Green State Criteria
Parameter Criteria for Green LED status
+5 V rail ±5% from nominal
+3.3 V rail ±5% from nominal
+12 V rail ±5% from nominal
–12 V rail ±5% from nominal
Fans >1500 RPM for all fans
Temperature 0–50 °C