method and arrangement for sturgeon and intrinsically safe control of the signalabläufe in straßenverkehrsanlagen on electronic zählketten

摘要

The control of the sequence of switching in a traffic light system is achieved by a synchronous counter unit. Since it is essential to avoid the loss of pulses in a system of this type or continuous check is made on the counter state. The main counter is operated in confirmation with a back-up counter. The main counter operates a memory that provides a number that is checked against the back-up counter value in a comparator. If any difference exist, alarm signals are generated.