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HP count with data logging control and FPGA reference control access

Hello,

 

I am using Veristand 2013 SP1.

My project is composed of a custom device inline, a FPGA (with controls/indicators on the front panel) and the Data logger control of NI VS workspace

 

During execution :

My custom device inline get and set values to controls/indicators (cf. screenshot) of the FPGA during execution.

The FPGA acquires and generates values with cRIO modules such as 9205, 9264 ...

 

When I start the data logging control on my workspace, I see HP periodically HP count which indicates a problem in the real time especially in the Primary Control Loop.

Without the recording, I have no problem and my custom devices accesses correctly, by reference at  controls/indicatros of my FPGA.

 

Now,  when I disable the access to controls /indicators of the FPGA front panel and I start recording, there is no problem.

 

So, it seems to be the couple of CD wich aceesing by reference at the FPGA and the execution of Control data logging that causes the HP count.

 

Have you any idea about that?

Does  The data logging control create interruption during recording?

 

Best regards.

R. K

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