A method for operating a forming device for forming plastic preforms into plastic containers, wherein in a working mode of the apparatus, the plastic preforms are transported by a plurality of forming stations along a predefined transport path, and by loading with a fluid medium are expanded into plastic containers, wherein to expand the plastic preforms, blow-moulding devices are used, inside which the plastic preforms are expanded into plastic containers, wherein in a change mode, at least one of the blow-moulding devices is removed from the apparatus and/or one of the blow-moulding devices is arranged on a blow-mould carrier of the apparatus,
- wherein
- to change the blow-moulding devices, a change device is used and this change device is integrated in a module which can be separated from the clean room, and the change device is arranged inside a lock room which can be brought into connection with the clean room of the forming device, wherein the module of the change device itself forms this lock room, and the change device is situated inside the lock room with further devices such as a magazine for blow-moulding devices, and the lock room can be isolated gas-tightly from a (non-sterile) environment in order to be able to maintain sterile conditions inside this lock room.