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Can I Use Different Sample Clocks for Correlated DI and DO?

Hardware: CompactRIO>>Digital Input Modules, CompactRIO>>Digital Output Modules, Multifunction DAQ (MIO)>>M Series

Problem: On M-Series and CompactDAQ multifunction data acquisition boards, both Digital Input (DI) and Digital Output (DO) tasks can be correlated to an external signal.  Can I use a different external signal for the DI and DO tasks?

Solution:

Yes.  For instance, you could use your Analog Input clock as the sample clock for DI while using the Analog Output clock as the sample clock for DO.

For M-Series devices, only port 0 supports correlated Digital Input/Output (DIO).  Therefore all of your DI and DO lines must be on port 0, but you can use different sample clocks for the DI and DO tasks.  The direction (input or output) of lines on port 0 is selectable on a per-line basis.

For CompactDAQ modules, only modules in slots 1 through 4 support correlated DIO.  Therefore you must put your DI or DO modules in these slots to use correlated DI or DO.  See pages 27 and 28 of the CompactDAQ User Guide and Specifications for more information.  The direction of digital lines on CompactDAQ modules depends on what module you are using.  See the linked Knowledge Base below for more information. 



Related Links:

Product Manuals:NI cDAQ-9172 User Guide and Specifications
KnowledgeBase 3UN91NB9: C Series Modules Supported in the NI cDAQ-9172 CompactDAQ



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Report Date: 08/23/2007
Last Updated: 08/27/2007
Document ID: 4CM6E5T3

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