Thanks for your kind reply Archie.
I,ve just did some trial and i was able to read DM from Nj (on a digital meter for example).
I confirm you that NJ supports Ethernet Fins Protocol , (but only if you give to your variable a fixed address like %D5000).
I'm not yet able to read a single bit , because i don't know what I have to write in "Plc value adress" of a lamp for example.
I tried D500.00 but don't works .. any Idea ?