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Old March 31st, 2009, 09:36 AM   #1
Controls_Engineer79
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Forgive me if this seems like a stupid question

But this is something that I've always tended to get azz-backwards

Most of my programing expearence - and my education for that matter have delt with equipment and hardward that labeled DC devices and/or inputs as "sinking" or "Scourceing" now as you also know alot of devices use the terminology NPN and PNP to describe their DC output or input connections - i USED to be really familar with this but its been a while since i have had to use anything labeled NPN/PNP - so was wondering if someone could quickly remind me which was which.

Man i feel like i need a coffee
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Old March 31st, 2009, 09:44 AM   #2
Mickey
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http://www.plcs.net/chapters/dcin25.htm

http://forums.mrplc.com/index.php?showtopic=1129
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File Type: pdf npn-pnp.pdf (251.5 KB, 29 views)
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Last edited by Mickey; March 31st, 2009 at 09:52 AM.
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Old March 31st, 2009, 10:05 AM   #3
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Quote:
Originally Posted by Controls_Engineer79 View Post
But this is something that I've always tended to get azz-backwards
Don't be too hard on yourself: the whole Allen-Bradley company gets it exactly the same way and feels good about it

It is, after all, a matter of convention and tradition.
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Old March 31st, 2009, 11:08 AM   #4
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Someone once told me a good way to remember PNP is to think of it as P(ositive)N(into)P(rocessor). Hopefully he wasn't azz-backwards because this is one thing i haven't forgotten.
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Old March 31st, 2009, 11:15 AM   #5
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The NPN is a Sinking device. One side of a load is attached to a positive DC voltage and the other side of the load is attached to the input (NPN)of the PLC. The PNP is just the opposite.
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Old March 31st, 2009, 12:23 PM   #6
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P(eeing) aNd P(eeing) is like Sourcing and sourcing da pee, ya see. PNP = Sourcing

While Not P(eeing) Nope, would be like not sourcing, therefore Sinking. NPN = Sinking
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