A ply wire sensor system is provided for a tire carcass ply in a green tire carcass having a toroidal shape, the tire carcass ply having a plurality of spaced apart ply wires extending across the toroidal shape. The puncture member has a tip fitting portion at a proximal end and a puncture needle at a distal end. For each segment, provision is made of a separate set of two-conductor local data lines which lead via line switches to two-conductor master data lines common to all the memory areas.