1- yes i have.
2- i think they have part number but i have not access to them right now.
3-UNO
Hi,
With the DMM, measure the RESISTANCE between the 24V -ve GND terminal and the Arduino GND terminal.
If it is a short then your 24V supply will be fine.

Tom...
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Hi
I have already done it.
Yes. it is short
Hi,
That means that the gnds are all together and you can use your 24V supply, -ve to the gnd terminal.
Tom..
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