COMPACT FAIL SAFE INTERFACE AND VOTING MODULE INCLUDING THE COMPACT FAIL SAFE INTERFACE

A compact fail safe interface includes an astable multivibrator ring type oscillator that includes an odd number of inverting components. Power supply inputs of the inverting components of the oscillator constitute functional inputs to the interface. In the event that one of the inputs is not correctly supplied, the oscillator generates a continuous safe state output signal. The interface is particularly suited for use with voting modules designed to increase both the safety and the availability of an installation.