Hydraulic system and method for operating a hydraulic system

A method for operating a hydraulic system comprising two or more groups of valves, the method comprising the steps of:

• providing at least two valves connected to a bus in each group of valves,
• wherein each of the at least two valves in each group comprises a primary memory for storing a set of parameters for the valve and a secondary memory for storing said set of parameters of a different valve of the same group,
• storing the set of parameters for each valve in the primary memory,
• storing the set of parameters of a different valve of the same group in the secondary memory of each valve,
• downloading said set of parameters from the secondary memory of one of the valves into the primary memory of another one of the valves that is a defect valve or of a spare part valve for replacing a defect valve or a spare part valve,
• examining, by a first one of the valves with a secondary memory storing the set of parameters of a second one of the valves, if the second one of the valves is available on the bus;
• if the second one of the valves is not available on the bus, but a spare part valve is available, updating a primary memory of the spare part valve with the set of parameters stored in the secondary memory of the first one of the valves, and
• calculating and comparing a check sum value of a memory area of said primary memory of the spare part valve and a check sum value of a memory area of said secondary memory with each other after the step of updating the primary memory of the spare part valve.