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Installation and Operation
Internal or External Power Selection
Switch S1 on each SC-206X Series board selects internal or external +5 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 external +5 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 external +5 V supply. Also, any
accessories connected to a DIO-32F board must be powered externally because this board does not
supply +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
Lab-NB
NB-DIO-24
NB-DIO-32F
NB-MIO-16
NB-MIO-16X
AT-DIO-32F
AT-MIO-16
AT-MIO-16D
AT-MIO-16F-5
AT-MIO-16X
Lab-PC
Lab-PC+
PC-DIO-24
PC-DIO-96
MC-DIO-24
MC-DIO-32F
MC-MIO-16
1
These limitations are caused by a series fuse on the +5 V out on these boards, rather than
the remaining power per slot.
DIO-32F boards do not supply +5 V power.
2
SC-206X Series User Manual
Allotted Power
Power Used by
by Slot
2.0 A
2.0 A
2.0 A
2.0 A
2.0 A
No Restriction
No Restriction
No Restriction
No Restriction
No Restriction
No Restriction
No Restriction
No Restriction
No Restriction
1.6 A
1.6 A
1.6 A
Power from Board Available
Board
0.8 A
0.8 A
1.6 A
1.5 A
1.4 A
1.28 A
1.5 A
1.7 A
1.7 A
1.6 A
0.6 A
0.15 A
0.16 A
0.45 A
0.8 A
1.4 A
1.4 A
5-4
© National Instruments Corporation
Chapter 5
for Accessories
1A
1
1.0 A
1
0 A
2
0.5 A
0.25 A
1
0 A
2
1 A
1
1 A
1
1 A
1
1 A
1
1 A
1
1
1 A
1 A
1
1 A
1
0.8 A
0 A
2
0.2 A
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