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Using CompactRIO Scan Mode with Unsupported Backplanes

Primary Software: Driver Software>>NI-RIO
Primary Software Version: 1.0
Primary Software Fixed Version: N/A
Secondary Software: N/A

Problem:
Is it possible to use CompactRIO Scan Mode with Unsupported Backplanes?

Solution:
Yes, it is possible to use CompactRIO Scan Mode with an unsupported backplane with a few addtional steps.  To use cRIO Scan mode with an unsupported backplane, it requires LabVIEW FPGA to compile in support for specific slots as the FPGA logic for a full Scan Mode interface will not fit on unsupported backplanes.  This procedure does require LabVIEW FPGA and a compile, but no FPGA programming.

1. Add a cRIO controller that supports Scan Interface (cRIO-901x) to your project
2. Add a the cRIO backplane to your project
3. Right-click on the Chassis item and select New » C Series Modules
4. Add the modules desired to the project
5. Repeat steps 3 and 4 for addtional modules
6. Right-click on the Chassis item and select New » FPGA Target
7. Right-click on the FPGA target and select New » VI
8. Save and compile the blank FPGA VI 

When you compile this blank FPGA VI, it will pull in the required FPGA logic to support CompactRIO  Scan mode in the slots that have modules under the chassis item. Next, open and run the FPGA VI using the Open FPGA Interface function before your read/write to any I/O variables so the FPGA application and scan logic is deployed to the cRIO.

Related Links:
Developer Zone Tutorial: Using NI CompactRIO Scan Mode with NI LabVIEW Software
Developer Zone Tutorial: The RIO Scan Interface Under the Hood 
Developer Zone Tutorial: C Series Modules Supported by CompactRIO Scan Mode

Attachments:





Report Date: 11/13/2008
Last Updated: 06/16/2009
Document ID: 4RCFASLX

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