Answer Posted / rampal.m.

Power supply is 24vdc this can be load wear upto 600 ohm minimum operating voltage 10.5vdc for load 250 ohm (abb tx) so minus the load 600-250 =450 ohm from graph.
Now inst cable copper conductor has resistance per km approx= 25 ohm/km then divided 450/25=18km.
Answer=18km .

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