Hello, I'm using a NI USB 6210 to record angles from a sensor. The sensor has 3 cables which are connected to the following ports: PFI 0 / P0.0 (In) = port 1 PFI 2 / P0.2 (In) = port 3 D GND = port 5 pinout available here: https://www.ni.com/documentation/en/multifunction-io-device/latest/usb-6210/pinout/ I'd like to add a second sensor to record another angle signal at the same time. Is this even possible with the NI USB 6210? When I try to setup the second sensor using PFI 1 and PFI 3 I get an error message in SignalExpress that the same physical device can't be used for multiple virtual ones. Could PFI 4 - PFI 7 (which are shown as outputs in the pinout) be used as inputs? If it's not possible to use the NI USB 6210 for this, what would be an alternative device? Apart from the two angle sensors, there is a third sensor that would need to be connected to 2 analog ports. Thank you.

- your linked example *does* illustrate how to enforce sequencing using the error cluster and normal LabVIEW dataflow principles. - Maybe you can use a single AO task to generate the sample clock your encoder tasks need? You could configure a hardware-clocked AO task that generates a buffer full of 0.0 Volts and then have two encoder tasks that "borrow" the AO sample clock. In the encoder tasks' calls to DAQmx timing, set the 'source' input to something like "/Dev1/ao/SampleClock" and follow the dataflow sequencing shown in the example you linked to make sure the AO task starts *last*. -Kevin P

Multifunction DAQ

NI USB 6210 / adding a second digital input

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The MAX task is in "continuous" mode and the type of sample clock is set to "internal".

Yes, dataflow sequencing is used with the error lines. Also the digital task is started before the analog task is started.

I found the problem: The "number of samples" for DAQmx Read was only specified for the digital task - not for the analog task (at least not in Labview, only in MAX).

Thanks for your help Kevin.