Accessing Unused Lines on Connector when Using CompactRIO Expansion ChassisHardware: CompactRIO>>Chassis (Backplanes)>>cRIO-9151, PXI/CompactPCI, Reconfigurable I/O (RIO)>>R Series>>PXI-7831R
Problem: I am using a cRIO-9151 expansion chassis with my PXI-7831R device. The cRIO chassis is connected to Connector 1, which is one of the DIO connectors of the PXI-7831R device. I am looking for documentation on which lines of that DIO connector are mapped and used by the expansion chassis. I need to maximize the number of digital lines I can use. Is there a way to access the digital lines of that connector that are not mapped to or used by the cRIO expansion chassis?Solution: There is no way to access any of the lines on the DIO connector used by the expansion chassis. The cable connecting the cRIO chassis to the R-series device does not have any break out points. This means that all the lines are connected on both sides, leaving none exposed. Regardless of whether all the lines are mapped or used by the expansion chassis, the unused lines cannot be accessed in any way. Thus documentation on which lines are used or mapped would not be useful information. If you need additional digital lines for your application, you can use digital cRIO modules in the expansion chassis to get a higher channel count. For example, the cRIO-9425 has 32 digital input channels. You could use 4 of these modules in an expansion chassis to get a total of 128 digital channels, instead of the 40 channels available on the PXI-7831R DIO connector. Related Links: Products & Services: NI cRIO-9425 - 32-Channel, 24 V, 7 µs, Sinking Digital Input Module for CompactRIO Attachments:
Report Date: 04/08/2005 Last Updated: 04/08/2005 Document ID: 3K76J0DS |
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