how to connect touch probe to mesa 7i96?

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23 May 2021 14:12 - 23 May 2021 14:26 #209908 by mhd325ic
I have a NPN-NO type of touch probe which I want to connect to 7i96 as probe input. Is it the correct way to wire to 7i96 as shown in the following?

Because the probe is normally open, it is continuously provides voltage to 7i96 input4 as a NC signal. When the probe touch workpiece. the signal will pull the voltage to ground which is an open signal to 7i96. Is it correct?

Please forgive my limited circuit knowledge. Any input is appreciated!
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Last edit: 23 May 2021 14:26 by mhd325ic.

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23 May 2021 14:40 #209911 by tommylight
You can invert the inputs in hal by just adding _not to the end of the input pin line.

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23 May 2021 15:21 #209914 by PCW
Since you have a NPN sensor, it would make more sense
to connect the 7I96 input common to +12V
(so the 7I96 inputs sense a connection to ground)

This would mean rewiring any home switches
etc with a common ground

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23 May 2021 16:13 - 23 May 2021 16:14 #209919 by mhd325ic
Then this connection is a Normally Open signal to 7i96? Should a NC signal be preferred for inputs to 7i96?
Last edit: 23 May 2021 16:14 by mhd325ic.

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23 May 2021 18:24 #209936 by PCW
For limit switches NC is preferred
(so a broken wire is detected as a fault)

But your probe is NO

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24 May 2021 01:16 - 24 May 2021 01:35 #209968 by mhd325ic
Peter, thank you for the explain. Let me reroute my limit switchs.
Last edit: 24 May 2021 01:35 by mhd325ic.

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