Method for operating a filling system and filling system

A filling system for filling media into containers, comprising:

• at least one first filling point;
• and
• at least one second filling point;
• wherein the first filling point has at least one first filling valve, at least one first flow or fill level sensor and at least one first control and evaluation unit for controlling and monitoring the filling process of the first filling point;
• wherein the second filling point has at least one second filling valve;
• wherein the first filling point has at least one second flow or fill level sensor and at least one second control and evaluation unit for controlling and monitoring the filling process of the second filling point, at least one second flow or fill level sensor and at least one second control and evaluation unit for controlling and monitoring the filling process of the second filling point;
• wherein a valve curve of the first filling valve is stored in the first control and evaluation unit;
• wherein a valve curve of the second filling valve is stored in the second control and evaluation unit, and wherein the first control and evaluation unit and the second control and evaluation unit are connected to one another via a communication channel;
• wherein the first control and evaluation unit is designed to report the diagnostic start to the second control and evaluation unit after transition to a diagnostic mode;
• wherein the first control and evaluation unit is further designed to output substitute flow rate or substitute fill level values during the diagnostic mode;
• wherein the second control and evaluation unit is designed to transmit a deviation message to the first control and evaluation unit in the event of detection of a deviation of the current flow or fill level value from the flow or fill level value expected on the basis of the valve curve;
• and
• wherein the first control and evaluation unit is further designed in such a way that, after receipt of the deviation message, the first control and evaluation unit interrupts the diagnostic mode and switches to normal operation or outputs corrected substitute flow or substitute level values.