I would be very surprised if you could get a PLT file out of PhotoShop.
A PLT file is for plotters and is nothing more than a list of ASCII data plotter commands.
In the simplest terms, the commands look like:
P1 ; mount Pen 1
D, 127.32, 39902 57.40,207.66 ; Draw from starting X,Y to ending X,Y etc…
These commands drive the plotter servo motors to create line drawings. It would be a real piece of work to convert a PSD raster image into Vector data and then mash the vectors into a PLT file.
HTH
Mr3
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What is your desired end result?
There is a Photoshop Plug-in that will allow Export to .PLT but it only works with Greyscale images.