NI-9403 with 24V

[jwscs]

hi everyone!

i have a NI-9403 with two incoming wires from an UPS,

which carry either 0V or 24V as status signal.

my first question is, will i destroy the module and should lower the 24V to 5V?

the documentation [1] states that "Overvoltage protection for Channel-to-COM" can be """+-30V max on up to 8 channels"

and [2] "the NI 9403 tri-states all the DIO channels for approximately 280 milliseconds""" and """the NI 9403 automatically recovers to the latest direction configuration and output state. If the overcurrent condition still exists, the module again tri-states the channels. This cycle continues until the over current condition is removed or the current returns to an acceptably low level"""

does this mean, i cannot get reliable info in my program as long as i use 24V?

thanks for your help and time!

[1] http://www.ni.com/pdf/manuals/374069e.pdf

[2] http://digital.ni.com/public.nsf/allkb/EC4E9B0A2F7A97D3862572FD006B7D9C

[GerdW · Accepted solution]

Hi jwscs,

you could wire the 24V directly to your DIO module, but I wouldn't recommend this as "standard use case"…

I don't get your question on "overcurrent": what's the relation between voltage levels and overcurrent?

[jwscs]

sorry, that is my problem i have no knowledge of the technical side, i am a software engineer.

so the current-part only relates to how many amperes go over the wire?

[GerdW]

Hi jwscs,

yes, current is with Amperes and voltages are with Volts!

Even software engineers should have learned basic physics in school…

[jwscs]

yup i should 😉