System, which comprises a number of deflection rollers, a belt, a drive unit and a sensor unit, wherein the belt wraps at least partially around the deflection rollers in each case, so that at least a first strand and a second strand are formed by the belt, wherein one deflection roller of the deflection rollers is coupled to a drive unit in order to drive the belt in a circulating direction by way of this deflection roller, wherein the belt comprises a carrier material and a woven fabric, wherein the woven fabric comprises first threads and second threads, extending transversely in relation to the first threads, and is embedded in the carrier material, characterized in that the system comprises an exciter magnet, and wherein at least one thread of the first threads comprises magnetizable material or is formed from it, wherein the at least one thread of the first threads extends transversely in relation to the circulating direction, wherein the exciter magnet is arranged in such a way that the belt is guided past the exciter magnet in the circulating direction when the belt is driven by the drive unit in the circulating direction, wherein the exciter magnet is designed for generating an exciter magnetic field, wherein the at least one thread of the first threads is formed by the associated magnetizable material to be magnetized by the exciter magnetic field such that, whenever the at least one thread of the first threads forms an uninterrupted thread, a first magnetization is generated and, whenever the at least one thread of the first threads forms an interrupted thread, a second magnetization is generated, the second magnetization being different from the first, wherein the sensor unit is at a distance from the exciter magnet in the circulating direction, wherein the sensor unit is designed for the contactless sensing of a magnetization of the at least one thread of the first threads guided past the sensor unit in the circulating direction, and wherein the sensor unit is designed for generating a sensor signal which represents the magnetization of the at least one thread of the first threads that is sensed by the sensor unit. wherein the belt wraps at least partially around the deflection rollers in each case, so that at least a first strand and a second strand are formed by the belt, wherein one deflection roller of the deflection rollers is coupled to a drive unit in order to drive the belt in a circulating direction by way of this deflection roller, wherein the belt comprises a carrier material and a woven fabric, wherein the woven fabric comprises first threads and second threads, extending transversely in relation to the first threads, and is embedded in the carrier material, characterized in that the system comprises an exciter magnet, and wherein at least one thread of the first threads comprises magnetizable material or is formed from it, wherein the at least one thread of the first threads extends transversely in relation to the circulating direction, wherein the exciter magnet is arranged in such a way that the belt is guided past the exciter magnet in the circulating direction when the belt is driven by the drive unit in the circulating direction, wherein the exciter magnet is designed for generating an exciter magnetic field, wherein the at least one thread of the first threads is formed by the associated magnetizable material to be magnetized by the exciter magnetic field such that, whenever the at least one thread of the first threads forms an uninterrupted thread, a first magnetization is generated and, whenever the at least one thread of the first threads forms an interrupted thread, a second magnetization is generated, the second magnetization being different from the first, wherein the sensor unit is at a distance from the exciter magnet in the circulating direction, wherein the sensor unit is designed for the contactless sensing of a magnetization of the at least one thread of the first threads guided past the sensor unit in the circulating direction, and wherein the sensor unit is designed for generating a sensor signal which represents the magnetization of the at least one thread of the first threads that is sensed by the sensor unit.