Hi John, Well, in the mazak the only inductive sensors we had to hack that way were the ones in the turret so it made no difference. All the limits were mechanical switches so no problem with those. I see your point, and since I plan to use these as limits and homing switches, I guess I'll go with PNP.
El mié, 20 abr 2022 a las 13:29, John Dammeyer (<jo...@autoartisans.com>) escribió: > Ask yourself this question. > If a wire connecting to the limit switch or ESTOP breaks or becomes > intermittent does the system safely stop? > > One of the biggest reasons for using NC type switches (or PNP) is that a > failure in the power or wiring to them also causes a stop. > John > > > -----Original Message----- > > From: Leonardo Marsaglia [mailto:ldmarsag...@gmail.com] > > Sent: April-20-22 8:55 AM > > To: Enhanced Machine Controller (EMC) > > Subject: [Emc-users] NPN inductive sensors on 7i70 board > > > > Hi guys, > > > > A quick question to see if there's anything wrong with this. > > > > 7i70 comes ready for PNP sensors. In the mazak all the sensors were NPN > so > > when we converted it to LCNC we had to add a resistor between the +24 > volts > > and the input of each sensor on the 7i70 to have the two states and avoid > > replacing all the sensors. We used the inverted pins in HAL so it's all > > working ok. > > > > I would like to ask if you see any downside with this approach, because I > > plan to do the same with another machine mainly because here NPN sensors > > are way cheaper than PNP ones. > > > > Thanks as always for your help :) > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
