Assembly with at least two redundant analog input units for a measurement current

An assembly with at least two redundant analog input units for a measurement current, comprising:

• parallel-connected analog entry points for the measurement current, and comprising for each parallel-connected analog entry point:
• a current-measuring resistor;
• a voltage-measuring device with a high-ohmic voltage-measuring entry point for converting a voltage applied to the voltage-measuring entry point into a digital measurement value;
• a digital output for outputting the digital measurement value;
• and
• a controllable switching device for switching the analog entry point between a high-ohmic state and a low-ohmic state, the current-measuring resistor being situated at both the analog entry point and the high-ohmic voltage-measuring entry point in the low-ohmic state, and the at least two redundant analog input units being connected together via a communication connection and being configured to select one of the analog input units, which switches its analog entry point into the low-ohmic state to measure and convert the measurement current into a digital measurement value while the analog entry point in each remaining redundant analog input unit is switched into the high-ohmic state;
• wherein the high-ohmic voltage-measuring entry point of the voltage-measuring device within each of the at least two redundant analog input units is directly connected to the analog entry point;
• and
• wherein each of the at least two redundant analog input units is configured to compare, in both the high-ohmic and low-ohmic state of its analog entry point, its currently generated digital measurement value with a threshold value, to output an error message if the digital measurement value falls below the threshold value and, if its analog entry point is in the low-ohmic state, to cause another of the analog input units to switch its analog entry point into the low-ohmic state to measure and convert the measurement current into a digital measurement value.