Your drawing looks like you a r trying to use 6 inputs with one resistor. that will not work.

Only if it uses one input!
View attachment 209478
You need one resistor per input. Either the internal or an external one.

Thanks.
trying to use 6 inputs with one resistor is what I asked, not test yet, just wonder what will be?

 

If you are concerned about reliability it's better to use a normally-closed contact for the limit switch, which then opens when the switch is actuated.
That way an open-circuit anywhere (including a failed-open switch) will be recorded as a limit condition.
Open-circuit failures are generally more common than short-circuit failures.

Thanks
a very experienced suggestions.
Best

 

Thanks.
trying to use 6 inputs with one resistor is what I asked, not test yet, just wonder what will be?

Why not configure per post #10 and use 6 channels of DIO configured with internal pullup? Configure the switches as N/O (Normally Open) so your inputs will all be a logic 1. When any switch goes active your logic will be Logic 0. Really very simple with no external resistors needed and each channel is independent of the others.

Ron

 

Why not configure per post #10 and use 6 channels of DIO configured with internal pullup? Configure the switches as N/O (Normally Open) so your inputs will all be a logic 1. When any switch goes active your logic will be Logic 0. Really very simple with no external resistors needed and each channel is independent of the others.

Ron

Thanks,
I'll do it this way.
Best

 

For better reliability, as I previously mentioned, you could connect all NC (normally-closed) contacts in series with one end of the string to ground and the other to the input with the internal pullup.
The input will be logic 0 unless one of the contacts opens.
That way you always know that all switches are connected, and any open (switch or connection) will give a limit condition.

 

For better reliability, as I previously mentioned, you could connect all NC (normally-closed) contacts in series with one end of the string to ground and the other to the input with the internal pullup.
The input will be logic 0 unless one of the contacts opens.
That way you always know that all switches are connected, and any open (switch or connection) will give a limit condition.

That is the method typically used in a machine E-Stop circuit, all limits etc are NAND'ed together.
Any one sets an E-stop.
Max.