A diagnostic arrangement (200) for a charging park has plural components and a network arrangement. The components include a central gateway (270), at least one control device (280) and a diagnostic database (290) arranged at the central gateway. The diagnostic database contains files or data for diagnosis of the at least one control device. The network arrangement makes a core network available between the components. The at least one control device is connected via the core network to the central gateway. The network arrangement also has a backend server having a backend database with the same diagnostic information as the diagnostic database of the central gateway and is connected to the central gateway. A database extract (220) provides a list (201) of available diagnostics. The at least one control device has apparatus for diagnosis and/or conveying at least one value (208) regarding at least one status of the control device.