Digital I/O

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Connecting a Single-Ended Device to the NI 9411

I have some troubles with electrical noise (sometimes signal detected in absence of the real signal) while using NI 9411 with 24V single - ended device (which have own power supply).

According to cover sheet I can connect Diff/Single Ended +/-5 to 24V signal to this module:

Screenshot 2023-09-11 16.31.28.png


From the user manual:

Screenshot 2023-09-11 16.22.35.png

Already put pull-down resistor between DIa and COM, no effects, still some sporadic peaks received.

My question is about DIb - this input just "in the air" and not connected in this mode as shown above. But this is differential input. Should I connect DIb to the COM as well or keep unconnected?:

Screenshot 2023-09-11 16.28.55.png


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You can leave DIb floating.

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