Abstract: A method of operating a Power Line Communications (PLC) network including a plurality of nodes having wirelines extending therebetween for propagating PLC signals between said nodes over said wirelines. The method includes coupling to a set of nodes of the PLC network respective partitioning filters, which can be activated for countering propagation of the PLC signals through the nodes to which said partitioning filters are coupled. The method also includes selectively activating filters chosen from among said partitioning filters, so that said PLC network is partitioned into a plurality of sub-networks with the propagation of PLC signals between the various sub-networks countered by the activated partitioning filters.

Abstract: A method of operating a Power Line Communications (PLC) network including a plurality of nodes having wirelines extending therebetween for propagating PLC signals between said nodes over said wirelines. The method includes coupling to a set of nodes of the PLC network respective partitioning filters, which can be activated for countering propagation of the PLC signals through the nodes to which said partitioning filters are coupled. The method also includes selectively activating filters chosen from among said partitioning filters, so that said PLC network is partitioned into a plurality of sub-networks with the propagation of PLC signals between the various sub-networks countered by the activated partitioning filters.

Abstract: An operating head for automatic machine tools of the type mounted on a structure for moving along a set of three Cartesian axes having a first support, fitted to the structure for rotation around a first axis, and a chuck unit fitted to the first support, wherein the chuck unit is interchangeable and projects from the first support, and is designed to allow angular positioning around a second axis orthogonal to the first axis. The first support includes a power transmission system for the chuck unit. The connection of the chuck unit to the first support permits changing from rough to finish work by simply replacing the chuck unit, rather than replacing the entire operating head.

Abstract: Operating head for automatic machine tools of the type comprising a structure (2) which moves along a set of three Cartesian axes, a first support (3), fitted to the said structure in such a way that it can rotate around a first axis (C), and a chuck unit (5) fitted to the said support, wherein the said chuck unit (5) is interchangeable and projects from the said first support (3), and is designed to allow angular positioning around a second axis (A) orthogonal to the said first axis (C). Said first support (3) incorporates a power transmission system and means designed to connect the said power transmission system to the said chuck unit (5). This feature allows to change over from roughing to finishing tasks without replacing the entire head, as is necessary with known equipment in which the chuck assembly is mounted on a fork support, merely by replacing the chuck unit, a much quicker and cheaper operation.

Abstract: Operating head for machine tools characterised in that it comprises: