Abstract: The invention relates to a system for electrically monitoring warp yarn ruptures, comprising drop wires which in case of rupture of a warp yarn will fall from the warp yarns on an electrical contact rail. The locating time to determine the precise site of warp yarn rupture is thereby shortened substantially. To achieve this aim, the contact rails are severally divided in the longitudinal direction, that is, in the direction of the weft yarns. Light-emitting diodes are mounted at each of such divisions which they bridge. Those LEDs lighting up in case of warp yarn rupture permit rapidly reading off the narrower range within which a warp yarn rupture has taken place.