On Wednesday, 11 May 2022 16:19:58 EDT Peter C. Wallace wrote: > On Wed, 11 May 2022, gene heskett wrote: > > Date: Wed, 11 May 2022 16:13:58 -0400 > > From: gene heskett <ghesk...@shentel.net> > > Reply-To: "Enhanced Machine Controller (EMC)" > > > > <emc-users@lists.sourceforge.net> > > > > To: emc-users@lists.sourceforge.net > > Subject: [Emc-users] Do pnp prox switches need a pulldown load R? > > > > Greetings all; > > > > Peter in particular, > > > > This is my first try at utilizing a prox switch, and while the led on > > it responds just fine on 12 volts, I measure around 6 volts on the > > blue wire when its off, and only 7.1 volts when its fired. With > > +12.0 volts on the red wire. These are "PNP" switches. > > > > So I'm assuming my 10 meg meter is not enough load to pull it down > > when its off. So what value of loading R to common is needed to make > > it properly register to a field input of a 7i76 useing a 12 volt > > field power src? > > > > Is that 7 volts enough to make a field input reliably see a logic > > one? > > > > Thanks all. > > > > Cheers, Gene Heskett. > > -- > > "There are four boxes to be used in defense of liberty: > > soap, ballot, jury, and ammo. Please use in that order." > > -Ed Howdershelt (Author, 1940) > > If we desire respect for the law, we must first make the law > > respectable. - Louis D. Brandeis > > > > > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > Sounds faulty or mis-wired No docs, fleabay purchase. I'm assumeing the black wire is common, the red wire is the 9 to 30 volt supply, and the blue wire is the output.
Right? And its drawing over 120ma when fired, and if I leave it fired for 10 minutes it will burn my hand to touch it! This is true even if the blue wire is floating. I'll get another out of the bag. > > It should be very close to 12V in the high state > > (off state probably does need a load) How much? 10k, 47k? Thanks Peter. > Peter Wallace > Mesa Electronics Cheers, Gene Heskett. -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author, 1940) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
