Interbus has been developed for the sensor/actuator communication in the automation technique. This technically matured system has been standardised in the meantime acc. to IEC 61158 and 61784. For the main application fields different cable types are defined: remote bus cable, installation remote bus cable, S-line and loop.The two-conductor Interbus-Loop cable is to be applied as a data transmission cable as well as for the supply of sensors. The three-conductor Interbus-Loop cables is applied for supply of actuators. These cables are also suitable for Interbus-Loop 2.