Monitoring if buttons pressed on 24vac/24vdc circuits

Other Hardware General Electronics
1

Hi guys, im new to using arduino, and was wondering on the proper way to do this.

I was wanting to interface with a couple of machines to get the state of some buttons/limit switches to help with diagnosing during repairs.

Basically there is usually a 3 button station that has 2 NO buttons, and 1 NC button.
And then there are 2 NC limit switches.

Im guessing for the NC connections i would need to put the connection in series so that i can detect that the connection is broken. For the NO buttons i was wondering if there is a way for testing the continuity for the connection to know when the button is pressed.

These machines have a logic board that is 24VDC (old models), or 24 VAC (newer models).

I have uploaded an image of how the circuits connect to the logic control boards in these units, the red coloured wires are the ones i am hoping to poll the state of (whether it is NC or NO at the time)

image

2

Depends on what the switches are feeding and which Arduino.
Are the switches feeding relay coils or digital inputs or...?

3

Arduino Uno, and i believe they are just push button switches that just toggles within the logic chip

4

I would use opto couplers.

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