Control system for a technical installation, in particular a manufacturing or processing installation, which has at least one engineering station server, which is embodied and provided for use as part of an engineering of the technical installation, wherein at least one first hierarchically structured, digital representation of a first part of the technical installation and at least one second hierarchically structured, digital representation of a second part of the technical installation is implemented on the engineering station server, wherein the first hierarchically structured, digital representation of the first part of the technical installation is permanently assigned a first simulation model and the second hierarchically structured, digital representation of the second part of the technical installation is permanently assigned a second simulation model, characterised in that the first simulation model is permanently assigned to the first hierarchically structured, digital representation and the second simulation model is permanently assigned to the second hierarchically structured, digital representation, in each case via a checking association, which states that the first hierarchically structured, digital representation by the first simulation model and the second hierarchically structured, digital representation by the second simulation model have been successfully approved, wherein the first hierarchically structured, digital representation of the first part of the technical installation and/or the second hierarchically structured, digital representation of the second part of the technical installation have a digital seal, with the aid of which it is possible to determine an authenticity of the first and/or second hierarchically structured, digital representation, wherein the first simulation model permanently assigned to the first hierarchically structured, digital representation of the first part of the technical installation and/or the second simulation model permanently assigned to the second hierarchically structured, digital representation of the second part of the technical installation have a digital seal, with the aid of which it is possible to determine an authenticity of the first and/or second simulation model, and wherein a technical behaviour of the first part of the technical installation can be simulated by means of the first simulation model and a technical behaviour of the second part of the technical installation can be simulated by means of the second simulation model. wherein at least one first hierarchically structured, digital representation of a first part of the technical installation and at least one second hierarchically structured, digital representation of a second part of the technical installation is implemented on the engineering station server, wherein the first hierarchically structured, digital representation of the first part of the technical installation is permanently assigned a first simulation model and the second hierarchically structured, digital representation of the second part of the technical installation is permanently assigned a second simulation model, characterised in that the first simulation model is permanently assigned to the first hierarchically structured, digital representation and the second simulation model is permanently assigned to the second hierarchically structured, digital representation, in each case via a checking association, which states that the first hierarchically structured, digital representation by the first simulation model and the second hierarchically structured, digital representation by the second simulation model have been successfully approved, wherein the first hierarchically structured, digital representation of the first part of the technical installation and/or the second hierarchically structured, digital representation of the second part of the technical installation have a digital seal, with the aid of which it is possible to determine an authenticity of the first and/or second hierarchically structured, digital representation, wherein the first simulation model permanently assigned to the first hierarchically structured, digital representation of the first part of the technical installation and/or the second simulation model permanently assigned to the second hierarchically structured, digital representation of the second part of the technical installation have a digital seal, with the aid of which it is possible to determine an authenticity of the first and/or second simulation model, and wherein a technical behaviour of the first part of the technical installation can be simulated by means of the first simulation model and a technical behaviour of the second part of the technical installation can be simulated by means of the second simulation model.