MASSO inputs... only PNP or NPN also

skibbe

Skibbe
Do the inputs only accept positive voltage to trigger (PNP)? or can we ground the inputs to trigger them as well (NPN)?
 

masso-support

MASSO Support
Staff member
Hi @skibbe

You can use either PNP or NPN sensors. If you use NPN then you need to provide a voltage to the input through a pullup resistor and the NPN sensor will ground the input taking it low. You can then invert the input to make it work as you want.

I use NPN sensors on mine, inverting the input and they have built in resistors which made wiring them easy.

Hope this helps

Cheers

Peter
 

cncnutz

CNCnutz
Staff member
Hi @skibbe

5.6K is a good all round value to use.

I wrote a document on the weekend that might help with identifying and wiring homing sensors. Have a look and see if helps.

Cheers

Peter
 

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segoman-designs

SegoMan DeSigns
Quote from CNCnutz on November 18, 2019, 8:49 pm

Hi @skibbe

5.6K is a good all round value to use.

I wrote a document on the weekend that might help with identifying and wiring homing sensors. Have a look and see if helps.

Cheers

Peter

Peter,

What is the recommended watt rating for these resistors?

Thanks
 

cncnutz

CNCnutz
Staff member
@segoman-designs

It really doesn't matter as these are logic levels only and worst case scenario you couldn't even pull 1/8th of a watt.

If you go 1/4 watt you will be good.

Cheers

Peter
 
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