CONTROLLER FOR SWITCH MACHINE

摘要

A switch machine electronic controller includes a point detecting circuit having Namur sensors for detecting an indication rod target in first and second point positions, and a lock detecting circuit having Namur sensors for detecting a lock box target in first and second lock positions. A microprocessor processes the signals to provide Normal and Reverse outputs. The Normal output is enabled when the first point and lock detection signals have values within a predetermined ON value range, and the second point and lock detection signals have values within a predetermined OFF value range. The reverse output is enabled when the second point and lock detection signals have values within the ON value range, and the first point and lock detection signals have values within the OFF value range. Both outputs are disabled when any of the signals has a value that corresponds to a shorted, open or indeterminate value range.