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National Instruments Corporation
B-1
B
LED Indicators
This appendix describes how to read the LEDs on the front panel to
interpret the status of the VXIpc 870 Series.
VXIbus Interface Status LEDs
The VXIbus interface status LEDs are located at the top of the module
and include four LEDs:
FAIL
,
SYSF
,
ONLINE
, and
PWROK
.
They indicate the various stages of initialization that occur as the
VXIpc 870 Series boots. The following paragraphs describe each LED.
SYSF LED
The
SYSF
LED is lit when the VXIbus SYSFAIL signal is asserted. It does
not necessarily indicate that the VXIpc 870 Series is asserting SYSFAIL,
only that there is a device in the system asserting SYSFAIL.
FAIL LED
The
FAIL
LED is lit when the VXIpc 870 Series is driving the SYSFAIL
signal. The VXIpc 870 Series asserts SYSFAIL when the PASSED bit in its
VXIbus status register is clear. The PASSED bit is set by the power-on self
configuration circuitry (POSC) when it has completed initializing the
VXIbus interface.
ONLINE LED
The
ONLINE
LED is lit when the Resource Manager has successfully
completed and the VXIbus interface is ready for application programs.
PWROK LED
The
PWROK
LED is lit when all the various voltages on the VXIbus
backplane are present and within the tolerance range of the onboard
detection circuitry. These voltages are monitored behind short circuit
protection devices. If the
PWROK
LED is not lit, it could indicate either
that a fuse is blown or one of the VXIbus power supplies is not working.
