Upgrade of the CMS ECAL Detector Control System During the CERN Large Hadron Collider Long Shutdown II

As part of the Compact Muon Solenoid (CMS) experiment, the electromagnetic calorimeter (ECAL) detector control system (DCS) is undergoing a large software and hardware upgrade during the second long shutdown (LS2) of the CERN Large Hadron Collider (LHC). The DCS software, running under the WinCC Open Architecture (OA) platform, required fundamental changes in the architecture as well as several other upgrades on the hardware side. The extension of the current long shutdown (2019-2021) is offering a unique opportunity to perform more updates, improve the detector safety and robustness during operations, and achieve new control features with an increased modularity of the software architecture. Starting from the main activities of the ECAL DCS upgrade plan, we present the updated schedule for the LS2. This covers several aspects such as the different software migrations of the DCS, the consolidation of toolkits, as well as some other improvements preceding the major ECAL upgrade foreseen for the next long shutdown (2024-2025).