The invention relates to a system for operating a plant. The plant comprises a data equipment. The data equipment is provided at the location of the plant itself. The 5 data equipment comprising a data structure divided into at least a first data storage device (1,2,22) and a second data storage device (3,4,23). The at least first data storage device (1,2,22) is accessible from an external data source. The status of the first data storage device (1,2,22), during operation of the system, is determined as being trusted or un-trusted. The status of the 0 second data storage device (3,4,23), ab initio, is determined as being trusted. The external data source is connected to the first data storage device (1,2,22) and to the second data storage device (3,4,23), and the second data storage device (3,4,23) is connected to the first data storage device (1,2,22) along a data interfacing device (6,25,26).
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