Simulation of axle counting system using myRIO embedded devices

The main usage area for reliable train wheel detection system is represented by axle counting systems for railway track vacancy. In many countries through the world, track circuit technology is superseded and replaced by SIL-4 ¹ certified axle counter systems. Modern axle counting technology is now an integrated part of railway safety signaling systems and it is able to provide critical information beyond track vacancy detection. One of the alternative approaches to the track circuit design uses a “check in/check out” principle. The main logic of this principle is that once a train is detected or “checked in” to a block, it is assumed to be present there until it is “checked-out”. Simulation of an axle counting system with virtual instrumentation and embedded myRIO devices is very useful for didactic purpose and understanding the working principles of the axle counters systems and inductive sensors.