Proximity Wiring Problem

[Bruce]

Hi All

My first post but i have been lurking for awhile.

Firstly i would like to thank Audioandy for his help with my safety circuit and TonyD for his wiring schematic and pics.

I am nearly finished with my first build and today i was able to get my motors to turn.

I have a problem with my npn no proximity switches (LJ12A3-4-Z/BX) or it could just be me.

( 1/5Pcs Inductive Proximity Sensor Detection Switch NPN DC 6-36V LJ12A3-4-Z/BX UK | eBay )

If i connect one directly to the PMDX126 it does what it's supposed to in mach3.
If i parallel two as the PMDX manual shows it trips in mach3



Am i missing something in the mach settings or do i need different sensors?

Any help or suggestions would be appreciated.

Thanks
Bruce