Abstract: There is described an engineering system for an automation system having data required for engineering the automation system stored in the engineering system, and a determination device to determine automatically in response to a user request from the engineered automation system, maintenance-relevant information for display in a diagnostics area on a visualization system. Furthermore there is described a method for maintaining an automation system having components, wherein the components are connected to an engineering system and maintenance-relevant information is determined by the engineering system. The maintenance-relevant information can be displayed by the engineering system.