Represents the speed of the motor as a floating point value between -1
        (full speed backward) and 1 (full speed forward).

def value(self):
        """
        Represents the speed of the motor as a floating point value between -1
        (full speed backward) and 1 (full speed forward).
        """
        return (
            -self.enable_device.value
            if self.phase_device.is_active else
            self.enable_device.value
        )