The invention relates to a method for operating a process engineering system (100) in which actuation units (140) which are externally driven and are operated using actuators by means of a pressurized operating fluid (e) are used to control and/or regulate and/or monitor process parameters (a, b, c) and are each configured to assume a safe state in the absence of a sufficient supply of the operating fluid (e), wherein a plurality of the actuation units (140) are supplied with the operating fluid (e) via a supply line (135) between a common supply unit (130) and the plurality of actuation units (140), and wherein the supply of the operating fluid (e) to the plurality of actuation units (140) is actively reduced if necessary at least to such an extent that said actuation units each assume the safe state, and to an actuation system (120) and a process engineering system (100).
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