PROXIMITY SWITCHES

[CHANDRU]

WHAT IS POSITIVE SWITCHING AND NEGATIVE SWITCHING IN PROXIMITY SWITCHES.

ALL I KNOW IS PNP-NO/PNP-NC AND NPN-NO/NPN-NC.


WILL ANY BODY HELP ME.
THANKS

CHANDRU

[Al_The_Man]

I think you are refering to PNP or NPN which relates to either sink or source, IOW you can have a input device that sources (PNP) that switches the positive rail into a sinking input.
Or with NPN, vice-versa, switches to the common or - rail into a source type input.
By input, I am refering to a PLC type input card.
P.S. turn your caps off, it is equivalent of shouting.
Al.