Isolation And Digital Isolators - National Instruments PXI-6238 User Manual

Isolation and Digital Isolators

NI 6232/6233 devices are isolated data acquisition devices. As shown in
Figure 9-1, the analog input, analog output, counters, and PFI/static DIO
circuitry are referenced to an isolated ground. The bus interface circuitry,
RTSI, digital routing, and clock generation are all referenced to a
non-isolated ground. Refer to Table 9-1 for an example of the symbols for
isolated ground and non-isolated ground.
Analog Input
Analog Output
Counters
PFI/Static DI
PFI/Static DO
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Table 9-1. Ground Symbols
Isolated Ground
A
Isolation
Barrier
AI GND
A
Digital
Routing
A
and Clock
AO GND
Generation
Digital
Isolators
RTSI
P0
P0.GND
P1
P1.GND
Figure 9-1. General NI 6238/6239 Block Diagram
9-1
9
Non-Isolated Ground
Bus
Bus
Interface
NI 6238/6239 User Manual