Patent ID: 8644958

Claim:
A system for protecting an electric line for railway signals, said line comprising: a computerized central apparatus (ACC) connected to a plurality of peripheral posts (PP), each peripheral post comprising at least one plant-controller electronic card (CdE), which controls a plurality of plant-interface cards (IE) that supply the plants (E) directly, via a field bus (B 1 ), on the basis of the commands received from the plant controller and acquire the control signals from the field sensors, transferring them to the controller, said system being characterized in that it comprises: a protection bus (B 2 ) common to all the interface cards; a switching relay (T) for each interface card, controlled by the plant-controller card (CdE), which enables selective connection of its own interface card, via the field bus (B 1 ), with the plant (E) or with the protection bus (B 2 ); at least one backup interface card (IER) connected to the common protection bus (B 2 ) via a switching relay (TR), which is also controlled by the plant interface, which, in the case of a failure to one of the active interface cards, replaces said failed card automatically via switching of said relays.