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Chapter 2 Hardware Overview
© National Instruments Corporation 2-13 NI PCI-8254R User Manual
Figure 2-5. Connecting isolated input to a sourcing output device
Wiring an Isolated Output to an External Load
The digital output circuit sources current to external loads, as shown in
Figure 2-6.
Caution Do not draw more than 100 mA from 24 V or 30 V isolated outputs. Do not draw
more than 50 mA from 5 V isolated outputs.
Figure 2-6. Digital output sources current to external loads
Vcc
Sourcing
Output
Device
V
Current
Limiter
C
NI 8254R
Input
Digital Output
V
C
Vcc
NI 8254R
Load