Installation and Operation
Chapter 5
SC-206X Series User Manual
5-4
© National Instruments Corporation
Internal or External Power Selection
Switch S1 on each SC-206X Series board selects internal or ex5 V power for that board. If you
set S1 to the position labeled INT, the host computer powers the SC-206X Series board via the host
data acquisition board. If you set S1 to the position labeled EXT, the SC-206X Series board is powered
from an ex5 V source connected to the J2 connector located near the J1 26-pin header.
In many cases, the host data acquisition board can supply enough power to run the SC-206X Series
boards. If the total +5 V power drawn by external accessories (such as the SC-206X Series boards, the
SC-2070 or SC-2071 boards, the AMUX-64T board, and SSR Series boards) exceeds the power
remaining, then some of these accessories must be powered by an ex5 V supply. Also, any
accessories connected to a DIO-32F board must be powered externally because this board does not
5 V power. Table 5-1 shows the amount of power that each data acquisition board can supply
to external accessories.
Table 5-1. Amount of Power Data Acquisition Boards Supply
Board
Allotted Power
by Slot
Power Used by
Board
Power from Board Available
for Accessories
Lab-NB
2.0 A
0.8 A
1A
1
NB-DIO-24
2.0 A
0.8 A
1.0 A
1
NB-DIO-32F
2.0 A
1.6 A
0 A
2
NB-MIO-16
2.0 A
1.5 A
0.5 A
NB-MIO-16X
2.0 A
1.4 A
0.25 A
1
AT-DIO-32F
No Restriction
1.28 A
0 A
2
AT-MIO-16
No Restriction
1.5 A
1 A
1
AT-MIO-16D
No Restriction
1.7 A
1 A
1
AT-MIO-16F-5
No Restriction
1.7 A
1 A
1
AT-MIO-16X
No Restriction
1.6 A
1 A
1
Lab-PC
No Restriction
0.6 A
1 A
1
Lab-PC+
No Restriction
0.15 A
1 A
1
PC-DIO-24
No Restriction
0.16 A
1 A
1
PC-DIO-96
No Restriction
0.45 A
1 A
1
MC-DIO-24
1.6 A
0.8 A
0.8 A
MC-DIO-32F
1.6 A
1.4 A
0 A
2
MC-MIO-16
1.6 A
1.4 A
0.2 A
1
These limitations are caused by a series fuse on the +5 V out on these boards, rather than
the remaining power per slot.
2
DIO-32F boards do not 5 V power.
