Cannot combine channels HAVE in a four lanes of two myDAQs

Hello

I used the MAX Explorer to add two channels analog input (AI) of myDAQ in a task. It works very well for this.

For now I need application of analog input a four lanes, so I get two myDAQs for this. I add both of two channels of the two myDAQs AI in a task, but still get the message:

An exception occurred within the external code by a call call... VI 'BlockState.vi:2' was arrested in node "" a call to 'DAQmxAssistant_DAQmx control Task.vi:1 '.

Showed as below:

The photo below shows two myDAQ are used simultaneously for an application to HAVE four channels.

Could you please help or give some advice? The situation is fairly easy to reproduce. Just get two myDAQs and add both of its two channels of each myDAQ AI for combine four channels in the tasks of the Explorer MAX.

Thank you!

LKKSPP

This restriction is common to many materials DAQ.  Some devices do not support having channels of several devices in the same tasks, but it is still quite rare (DSA and devices in the same chassis. PXI X series) and the modules in the CompactDAQ same chassis come to mind

The main reason for this is that all devices in a single task share the same source of synchronization.  Unless you use a CompactDAQ or PXI chassis or using a RTSI cable between PCI devices, it is not a way for multiple devices to share the same source of synchronization.  So, each device must be in its own task.  This is the case for all devices no USB CompactDAQ, not only myDAQ.

I hope that clarifies what you see.

Tags: NI Products

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