On Wed, 11 May 2022, gene heskett wrote:
Date: Wed, 11 May 2022 16:13:58 -0400
From: gene heskett <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
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
It should be very close to 12V in the high state
(off state probably does need a load)
Peter Wallace
Mesa Electronics
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