DAQ VXI-SC-1102 Bedienerhandbuch Seite 105

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Chapter 16 PXI DAQ Devices
DAQ Hardware Overview Guide 16-2 www.ni.com
PXI DAQ Signal Conditioning
The PXI-1010 chassis has four slots for SCXI modules. You can use these
four SCXI slots the same way you would use a traditional (external) SCXI
chassis by cabling a DAQ device to one of the SCXI modules. See
Chapter 14, SCXI Hardware, for more information. In addition, there is an
internal connection between PXI slot 8 and the SCXI bus. You can use a
device in slot 8 to program the SCXI modules, sample analog signals from
the modules, and provide clock signals for scanning the channels on the
modules. If you use this internal connection, you do not need to connect a
cable from your device to an SCXI module. However, any modules that
you want to use in parallel mode must still be cabled to a device.
A PXI E Series device in slot 8 can sample SCXI analog input channels via
a special channel connected to the SCXI bus (ND_PXI_SC). See the
NI-DAQ Function Reference Online Help for more information. If you use
the internal connection to the SCXI bus instead of cabling to an SCXI
module, all the regular analog input channels on your device are available
for other uses.
Some resources of the device are reserved whether you use the internal
connection to the SCXI bus or cable the device to a module. Some of the
digital I/O lines (and the scan interval counter in the case of the
SCXI-1140) are reserved for SCXI.
A PXI E Series device in slot eight can use the SCXI slots in the PXI-1010
and one or more external SCXI chassis at the same time. You need an
SCXI-1346 multichassis adapter for each external chassis after the first.
The modules cabled to the device must all be in multiplexed mode. The first
external chassis uses analog input channel zero, the second uses analog
input channel one, and so on. You must set a unique chassis address for
each chassis, including the internal chassis.
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