© National Instruments
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2-11
Power Inhibit Switch LED Indicator
The chassis power inhibit switch has an integrated LED. This LED indicates one of two
conditions:
•
If the inhibit switch LED is steady green (not flashing), the chassis is powered on and
operating normally.
•
If the inhibit switch LED is red, the system fans have failed.
Inhibit Mode Switch
On the PXIe-1078 backplane is a four-position DIP switch (SW1). Switch 1 of SW1 controls the
chassis inhibit mode. (Refer to Figure 2-7.) In its default position (OFF), the PXI Express
controller controls the power supply on/off state based on the power switch on the chassis front
panel.
Figure 2-7.
Switch 1 of SW1
When switch 1 of SW1 is on, the backplane controls the power supply on/off state. This allows
you to circumvent the controller and turn the chassis on or off manually. When switch 1 of SW1
is on, the power supply turns on when the you press the front panel power switch. When the
power supply is on, holding down the front panel power switch for about one second turns the
power supply off.
Cautions
Be careful to avoid damaging the backplane when accessing this switch.
Suddenly removing power from an operating controller may result in loss of data and
incorrect behavior on subsequent boots.
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PXIe1078UM.book Page 11 Monday, December 23, 2019 10:44 AM
