Loop inspecting system of cab signalling based on virtual instrument

The function of most cab signalling systems is rather simple through it is vital; no self-test and closed-loop inspecting and control is performed. To set out the requirements of a cab signalling system to ensure that where the driver's movement authority is indicated by cab display, the driver receives adequate and timely information regarding the movement authority and its limits. In this paper, a new kind of loop inspecting system of cab signalling is proposed based on the state-of-art virtual instrument technique. The system configuration and the operation procedure are introduced in detail, as well as the design principle of both hardware and software.