Electronic circuit configuration for optionally connecting rotary speed sensors, especially in commercial vehicles

An electronic circuit configuration, comprising:

• an assigned signal conditioning circuit via which at least one rotary speed sensor of a vehicle is connected to an electronic control unit for further signal processing of a rotary speed signal, wherein:
• the signal conditioning circuit includes a switching arrangement for optionally connecting one of an active rotary speed sensor and a passive rotary speed sensor,
• the switching arrangement includes a signal conditioning subcircuit for the active rotary speed sensor and a signal conditioning subcircuit for the passive rotary speed sensor, which are able to be activated using at least one switching element, depending on the sensor type that is connected,
• the electronic control unit detects the currently connected sensor type and operates the at least one switching element for the selection of the suitable signal conditioning subcircuit, and respectively one switching element is connected in series between operating voltage potential/ground and two sensor inputs A and B of the signal conditioning subcircuit for the passive rotary speed sensor, respectively preconnected damping diodes being provided for preventing a current from the signal conditioning subcircuit for the active rotary speed sensor in the case of the connection of a passive rotary speed sensor.