An industrial control system comprising at least one industrial controller and method of transferring data in an industrial controller include use system-specific firmware of the industrial controller to execute at least one system task of a predefined set of system tasks independently from a user-specific industrial control program. The at least one system task is adapted to use in the operating phase while execution of the instructions defined in the user-specific industrial control program the at least one file system service to move data in a first dedicated storage location of the first data storage unit to a second data storage unit formatted for use with a file system, or use the at least one file system service to move data from the second data storage unit to a second dedicated storage location of the first data storage unit.