Mabe on the other side of the pond.
Not arguing because it doesn't matter but;
I've just done an inductive proximity sensor product search on Pepperl & Fuchs website
No. of products NPN 74
No. of products PNP 207
Same again but RS online
No. of products NPN 54
No. of products PNP 208
Edit: Just noticed the 2 wire ones are NAMUR type, this is quite a good document
http://www.simeks.biz.tr/resimler/pd...ciklamalar.pdf
Maybe the last time I used them (which is quite a number of years ago now :upset:) the PLC had input cards designed for them, although I've never been a fan of 2 wire type.