Assembly with at least two redundant analogue input units (1, 2) for a measurement current, having - parallel-connected analogue entry points (3, 4) for the measurement current, and containing in each case - a current-measuring resistor (15, 24), - a voltage-measuring device (8, 19) with a high-ohmic voltage-measuring entry point (11, 20), for converting a voltage that is applied to the voltage-measuring entry point (11, 20) into a digital measurement value, - a digital output (18, 28) for outputting the digital measurement value, and - a controllable switching device (12, 23) for switching the analogue entry point (3, 4) between a high-ohmic state and a low-ohmic state, which switching device (12, 23) consists of a parallel circuit comprising a high-ohmic resistor (13, 25) and a controllable switch (14, 26), wherein in the low-ohmic state the current-measuring resistor (15, 24) is situated at both the analogue entry point (3, 4) and the high-ohmic voltage-measuring entry point (11, 20), wherein - the analogue input units (1, 2) are connected together via a communication connection and are designed to select one of the analogue input units (for example 1), which switches its analogue entry point into the low-ohmic state in order to measure and convert the measurement current into a digital measurement value while the analogue entry point in each remaining analogue input unit is switched into the high-ohmic state, wherein - in each analogue input unit (1, 2), the high-ohmic voltage-measuring entry point (11, 20) of the voltage-measuring device (8, 19) is directly connected to the analogue entry point (3, 4) in one switch (14, 26) of said switches (14, 26) is open and - each of the at least two analogue input units (1, 2) is designed to compare, in both the high-ohmic and low-ohmic state of its analogue entry point (3, 4), its currently generated digital measurement value (16, 30) with a threshold value, to output an error message if the digital measurement value (16, 30) falls below the threshold value and, if its analogue entry point (for example 3) is in the low-ohmic state, to cause another of the analogue input units (for example 2) to switch its analogue entry point into the low-ohmic state in order to measure and convert the measurement current into a digital measurement value, characterised in that each analogue input unit (for example 2) is further designed, when in the high-ohmic state of its analogue entry point, instead of the measurement value that was generated locally, to output the digital measurement value that was generated by the analogue input unit having the low-ohmic analogue entry point and received therefrom via the communication connection. - parallel-connected analogue entry points (3, 4) for the measurement current, and containing in each case - a current-measuring resistor (15, 24), - a voltage-measuring device (8, 19) with a high-ohmic voltage-measuring entry point (11, 20), for converting a voltage that is applied to the voltage-measuring entry point (11, 20) into a digital measurement value, - a digital output (18, 28) for outputting the digital measurement value, and - a controllable switching device (12, 23) for switching the analogue entry point (3, 4) between a high-ohmic state and a low-ohmic state, which switching device (12, 23) consists of a parallel circuit comprising a high-ohmic resistor (13, 25) and a controllable switch (14, 26), wherein in the low-ohmic state the current-measuring resistor (15, 24) is situated at both the analogue entry point (3, 4) and the high-ohmic voltage-measuring entry point (11, 20), wherein - the analogue input units (1, 2) are connected together via a communication connection and are designed to select one of the analogue input units (for example 1), which switches its analogue entry point into the low-ohmic state in order to measure and convert the measurement current into a digital measurement value while the analogue entry point in each remaining analogue input unit is switched into the high-ohmic state, wherein - in each analogue input unit (1, 2), the high-ohmic voltage-measuring entry point (11, 20) of the voltage-measuring device (8, 19) is directly connected to the analogue entry point (3, 4) in one switch (14, 26) of said switches (14, 26) is open and - each of the at least two analogue input units (1, 2) is designed to compare, in both the high-ohmic and low-ohmic state of its analogue entry point (3, 4), its currently generated digital measurement value (16, 30) with a threshold value, to output an error message if the digital measurement value (16, 30) falls below the threshold value and, if its analogue entry point (for example 3) is in the low-ohmic state, to cause another of the analogue input units (for example 2) to switch its analogue entry point into the low-ohmic state in order to measure and convert the measurement current into a digital measurement value,