Method and control system for a technical installation with trend curve diagram

A computer-implemented method for representing operator control information in a context of a technical installation having at least one operator station server and one operator station client, the method comprising:

• a) receiving measurement values of at least one technical object of the technical installation via the at least one operator station server;
• b) continuously generating an actual trend progression of a received measurement value,
• b1) in an event of no measurement value being received from the at least one technical object, an interpolation of the measurement value being undertaken to generate an interpolated trend progression, until a measurement value is again receivable;
• b2) in the event that the actual measurement values of at least one technical object, which have occurred during a period of time of the visual presentation of the interpolated trend progression, is receivable from the at least one operator station server retrospectively, then the relevant actual measurement values from the operator station server is utilizable to generate the actual trend progression of the measurement value and a comparison of the interpolated and the actual trend progression is transferred to the at least one operator station client for visual presentation to the operator of the technical installation;
• c) transferring the actual trend progression and an interpolated trend progression from the at least one operator station server to the at least one operator station client;
• and
• d) visually presenting the actual and the interpolated trend progression to an operator of the technical installation.