pmdx-126 and limit switches

[jams]

I am in the process of replacing a gecko-g540 with a pmdx-126.
The swap  has been pretty straight forward with the exception of limit switches.

The limit switches are 2-wire npn proximity switches  that run off 12-24 vdc.
The g540 was able to drive a pair on Omron tl-n7dm2 wired in series  on a single input   and  a pair of q5md2 on another input  .

How would I go about hooking this up to the pmdx-126?   If they are wired like mechanical switches and say use  jp11 pin 11/gnd is used there isn't enough power to activate them.   

[Steve Stallings]

Sorry, but these sensors will not work with the PMDX-126. The PMDX-126 was
engineered to work with 3 wire sensors, mechanical switches, or logic level
input signals such as an MPG or optical index sensor. The open circuit voltage
at the inputs is only 5 volts and your sensors require 12 volts.

The G540 uses 12 volts on its inputs, but is not compatible with logic level
signals such as an MPG.

You cannot have it both ways and we chose to support logic level signals
at the expense of 2 wire sensors.

[jams]

Thanks Steve.
Looking over the options I think I will go buy some 3-wire npn  NC switches from omron. 
Some new cables will need to be run, but at least the mounting holes will line up.