Application of fail-safe multiple-valued logic for control of power press

The logical construction of a safety control for the operation of a power press is explicated. Fail-safe dual two-rail system signal processing and fail-safe multivalued logic operations as methods for achieving this control as a fail-safe system are described. A circuit for generating fail-safe two-rail run button signals based on ternary logic for concrete operation of the power press and an operation control circuit for confirming brake performance for each cycle of slide operation by using the run button signals are presented