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3.
Wire the ground of the power supply to the GND terminal of the power connector.
The NI 6581/6581B external power connector ground connection references an external
power supply to the PXI system. The external power connector does not provide any
means of isolation; therefore, use care when connecting a non-isolated supply to the
external power connector.
Using a grounded power supply as the external power source may cause ground loops
that increase noise on the power rails. NI recommends that you use a floating source that
is ground referenced to the PXI chassis using the ground connection provided by the
external power ground connector on the NI 6581/6581B.
For the maximum external power supply limit, refer to the NI 6581/6581B Specifications,
available from the Start menu and at ni.com/manuals.
Power Supply Control Signals
The following table lists the NI 6581/6581B power supply control signals and the
corresponding NI FlexRIO FPGA module signals.
Table 6. NI 6581/6581B Power Supply Control Signals and NI FlexRIO FPGA Module
NI 6581/6581B Supply Control Signal Name
BANK0_SUPPLY_SELECT
BANK1_SUPPLY_SELECT
PWR_SUPPLY_SEL_0
PWR_SUPPLY_SEL_1
Block Diagrams
10 | ni.com | NI 6581/6581B Getting Started Guide
Figure 6. P0.<0..7>, P1.<0..7>, P2<0..7> Data Port
Data from
NI FlexRIO
FPGA Module
Output Enable
from NI FlexRIO
FPGA Module
Data to
NI FlexRIO
FPGA Module
Signals
NI FlexRIO FPGA Module GPIO Out
GPIO_32
GPIO_32_n
GPIO_65
GPIO_65_n
Voltage Reference
Internal/External
8
8
8
DDC
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