Error -200251: No DMA Channels Available

[Claudio_G]

Hi,

   we have a multiple chassis setup (4 chassis) connected to the same RT Workstation.

I am trying to generate 3 square waves using buffered continuous generation on a 6723 PXI module on chassis 2 using a single task and I am trying to use a counter to measure frequency using ctr0 of another 6723 PXI module on chassis 1 using another task, I thus created 2 different custom devices for the purpose and when I run them separately they just run fine, while when I load both of them I get back "Error -200251: No DMA Channels Available"

Does anyone have a clue?

[Philipp_Kost]

Hi Claudio

the PXI 6723 (Specifications) has 1 DMA channel. Any additional operations, including counter inputs, must be interrupt-based and cannot use DMA.

For instructions on configuring the particular task to use interrupts, see KnowledgeBases "Configuring the Data Transfer Mechanism (Interrupts or DMA)".

Kind Regards,

Philipp K.

AE | NI Germany

[Claudio_G]

shouldnt each module have 1? I am using 2 different 6723 on 2 different chassis connected to the same RT Workstation.