01-16-2019 08:02 AM
Hi all!
I have a NPN sinking sensor (3 wires) that I want to connect to my NI9421, however I am lost.
Basically I have connected the power source to my sensor, and connected the sensor ground to my power source ground. Then I connected the sensor output wire to the NI9421's digital input pin, and the COM pin of the NI9421 to my power source ground. I am not getting any signal.
What am I doing wrong here?
Many thanks!
01-16-2019 11:05 AM
You will need to use a sourcing sensor for the 9421 inputs.
-AK2DM
01-17-2019 02:48 AM - edited 01-17-2019 02:54 AM
Thank you for your answer.
I got confused because at page 13: http://www.ni.com/pdf/manuals/373504g.pdf it says "The NI 9421 has sinking inputs". Hence why I have got NPN sinking open collector sensors.
Is there a way to "convert" my sensors so that I can connect them to the NI9421?
Many thanks!
01-21-2019 06:36 AM
Still struggling with this one. I cannot even get pulses from my sensor.
Its a NPN sensor, 3 wires:
1. + is connected to 24VDC +
2. - is connected to 24VDC ground
3. signal
I try to connect an oscilloscope between signal and 24VDC+ but I don't see any pulse.