On Wed, 11 May 2022, gene heskett wrote:
Date: Wed, 11 May 2022 16:43:59 -0400
From: gene heskett <ghesk...@shentel.net>
Reply-To: "Enhanced Machine Controller (EMC)"
<emc-users@lists.sourceforge.net>
To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
Subject: Re: [Emc-users] Do pnp prox switches need a pulldown load R?
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
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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.
If it draws excess current when on, it may be that blue is GND and black
is the output...
Peter Wallace
Mesa Electronics
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