Interface device

An interface module is proposed, to which sensors are connected and which is arranged in a control device, wherein an identification input indicates how the sensor data from the interface module is to be assigned. This makes it possible in particular to distinguish between safety-relevant and non-safety-relevant data. Furthermore, the type of data can be identified in this way. Advantageously, this identification input is designed as a voltage input, whereby the voltage levels are then converted into a bit sequence. The identification input is switched to ground via a resistor, so that in the case of an undefined input potential, the voltage level is switched to ground.