On Thu, 3 Sep 2020 at 02:27, James Reed <jsr...@hotmail.com> wrote: > > Evidently, I'm not accustomed to the usual NPN proxes. We have some NPN > devices at work that have the collector tied to supply, with the emitter as > the output.
I suspect that the nomenclature is mis-applied in the case of proximity switches. In the world of prox switches NPN means that the black wire connected to 0V (Blue) when the switch triggers, and with PNP it means that the black wire connects to brown (supply) when triggered. I suspect that this has almost nothing to do with the distribution of N-type and P-type semiconductors inside. -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
