Position determining sensor unit, comprising a number of N identical sensors (Sn = 1... N), which are arranged at predetermined spacings at positions (Pn) along a path, and a transmitter, - wherein the transmitter has a first end movable at least along the entire path and a length extending from the first end parallel to the path, - wherein each sensor (S1, S2 to Sn) comprises a first supply voltage terminal, a second voltage supply terminal and a switch output, - wherein the switch output is switched to an on state or an off state in dependence on a sensor signal exceeding a threshold value or falling below a threshold value, - wherein the supply voltage terminal of each sensor (Sn = 1... N) is connected with a supply voltage (Vsup), - wherein a first sensor is arranged at a start of the path and - wherein a last sensor is arranged at an end of the path, characterised in that - the second supply voltage terminal of the first sensor is connected with a reference potential and the first sensor has a current take up Isup, - the second supply voltage terminal of each further sensor (Sn>1) is connected with the switch output of the preceding sensor (Sn-1) and the respective further sensor (Sn) can be switched on or off by means of the switch output of the preceding sensor (Sn-1) and the respective further sensor (Sn) in the switched-on state has a current take Isup, - a current measuring unit is provided and the current measuring unit is arranged in front of the first supply voltage terminal of the first sensor or in front of the second supply voltage terminal of the first sensor, - wherein the current take Isup of all switched-on sensors (Sn) contribute to a sum current Isum measured by means of the current measuring unit, and wherein the sum current Isum is a multiple of the current take Isup and is proportional to a position (Pp) of the first end of the transmitter. - wherein the transmitter has a first end movable at least along the entire path and a length extending from the first end parallel to the path, - wherein each sensor (S1, S2 to Sn) comprises a first supply voltage terminal, a second voltage supply terminal and a switch output, - wherein the switch output is switched to an on state or an off state in dependence on a sensor signal exceeding a threshold value or falling below a threshold value, - wherein the supply voltage terminal of each sensor (Sn = 1... N) is connected with a supply voltage (Vsup), - wherein a first sensor is arranged at a start of the path and - wherein a last sensor is arranged at an end of the path, - the second supply voltage terminal of the first sensor is connected with a reference potential and the first sensor has a current take up Isup, - the second supply voltage terminal of each further sensor (Sn>1) is connected with the switch output of the preceding sensor (Sn-1) and the respective further sensor (Sn) can be switched on or off by means of the switch output of the preceding sensor (Sn-1) and the respective further sensor (Sn) in the switched-on state has a current take Isup, - a current measuring unit is provided and the current measuring unit is arranged in front of the first supply voltage terminal of the first sensor or in front of the second supply voltage terminal of the first sensor, - wherein the current take Isup of all switched-on sensors (Sn) contribute to a sum current Isum measured by means of the current measuring unit, and wherein the sum current Isum is a multiple of the current take Isup and is proportional to a position (Pp) of the first end of the transmitter.