7i76e bleeding voltage accross I/O?

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17 Jun 2019 02:32 #137085 by Type_Zero_Design
I am in the process of hooking up my limit and home switches on my retrofit.

The machine has mechanical switches for limits and separate home. Positive and negative limits are N/C and the home switch is N/O for some reason.

Currently have each "common" side of the switch hooked to +24v terminal strip and then the signal end terminated to I/O 0-8 on TB6.

With the terminal blocks unplugged from TB6 and voltage measures at the terminal blocks voltage is as expected. Untriggered LS shows 24V Untriggered home shows 0v. Triggered LS shows 0v home shows 24v.

**This is where it gets weird**
Once the terminal blocks are plugged to TB6 all terminations show 24v on terminals on TB6 regardless of switch condition?

It's like the voltage from other I/O is bleeding accross through the 7i76e

What am I screwing up here? I'm sure it's something dumb I'm doing.

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17 Jun 2019 02:37 #137086 by Type_Zero_Design
*** Update***

Just checked and as soon as 24v is applied to any input pin on TB6 all INPUT pins (1-16) show 24v

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17 Jun 2019 03:19 #137087 by PCW
Sounds like a missing ground/field common connection

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17 Jun 2019 05:48 #137095 by Type_Zero_Design
See like I said something stupid.

I was feeding the 24v + direct from the powersupply not the feild power on 7i76e.

Thanks!

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