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This paper on an IP network-based signal control signal system is from the proceedings of the 12th International Conference on Computer System Design and Operation in Railways and Other Transit Systems, held in Beijing, China, in 2010. The authors first briefly review some of the concerns regarding the use of conventional signaling systems for automatic block signals, including complicated wiring work for relays and unreliable simplex devices. Then they describe the IP network-based signal control system and its use for automatic block signals. In this system, the Logic Controller (LC), placed in a signal house, integrates several control logics of signaling field devices. A Field Controller (FC), placed near each automatic block signal, electrically controls the signaling field devices. The LC and FCs exchange the control data through an IP network. The authors report on new functions that have been developed in order to enhance maintainability and transport stability: a diagnostic function enables the FCs to recognize where a malfunction of field devices or cables has happened, by means of current sensors added in the FCs; and it is possible to maintain train operations, even in the case of a malfunction of track circuits, by tracing train movements around the track circuits concerned. These new functions are expected to contribute to quick restoration at the breakdown in the signaling devices and result in a stable transport environment. The paper reports the results of field tests carried out to confirm the functionalities and characteristics of the control system in a real world setting.

An IP network-based signal control system for automatic block signal and its functional enhancement