By calling GET workplaces/{workplaceId}/devices all devices assigned to a workplace can be retrieved. Depending on the system configuration, the caller receives back each individual programmable logic controller as a device or an abstract device that contains the recorded sensor values and states of all controllers. By calling GET devices/{deviceId} it can be queried for each device which physical quantities were recorded in which physical unit. Finally, with the call GET devices/{deviceId}/recordedTimeSeries, an application can access the recorded time series of the various process parameters in the respective unit.