The invention relates to a method for regulating the power supply of a number of field devices (S1, S2, S3, A1, A2), which are connected via a data bus line (DBL) and are supplied with power via this data bus line (DBL). According to the invention, the current demand of individual field devices (S1, S2, S3, A1, A2) is determined and the current consumption of the field devices (S1, S2, S3, A1, A2) is adjusted by means of corresponding control signals. This enables the current consumption of individual field devices (S1, S2, S3, A1, A2) to be centrally adjusted and thus adapted to the process conditions.