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Can I Use More Than 40 Digital I/O Lines on the NI 9151 R Series Expansion Chassis?

Hardware: CompactRIO>>Chassis (Backplanes)>>cRIO-9151

Problem:
I am using an R Series board in conjunction with an NI 9151 R Series expansion chassis. I have noticed that the digital connector the chassis is connected to only has 40 digital I/O lines available. Does this mean that the total number of channels on digital I/O modules in my expansion chassis cannot be more than 40?

Solution:
When using the NI 9151 R Series expansion chassis, you are not limited to the number of digital lines on the connector of your R Series card. In the case of C Series modules that have more than 8 channels (such as the NI 9476), there is not a direct connection between the signals and the digital ports on your R Series device. You can think of the expansion chassis as a separate system that shares data with the R Series card over the digital lines on the connector.

For example, you could have an NI 9476 (with 32 channels) in all 4 slots and have 128 digital output lines in your expansion chassis. Some of the digital modules that have 8 or less channels (like the NI 9401) operate in parallel mode which means that there is some direct connection between the digital signals and the ports on your R Series device. Since these are only the modules with 8 or less channels, even if you had an expansion chassis filled with these modules, you would not exceed 40 digital lines.

Related Links:
Product Page: NI 9151 R Series Expansion Chassis

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Report Date: 10/16/2006
Last Updated: 03/06/2009
Document ID: 42FFNLCW

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