A circuit arrangement for monitoring the operational state of an electric motor that includes an angle encoder mechanically connected with an electric motor. A first processor electrically connected to the angle encoder, wherein the first processor includes a first comparator that receives an output signal from the angle encoder. A second processor electrically connected to the angle encoder, wherein the second processor includes a second comparator that receives the output signal from the angle encoder. A shutoff component connected to the first and second processors to receive output signals from the first comparator and the second comparator, wherein the shutoff component shuts off the electric motor should an error be detected in either one of the output signals of the first and second comparators during a testing interval.