Author: Sumorok, K.
Paper Title Page
MOPGF025 Enhancing the Detector Control System of the CMS Experiment with Object Oriented Modelling 1
 
  • R.J. Jiménez Estupiñán, A. Andronidis, O. Chaze, C. Deldicque, M. Dobson, A.D. Dupont, D. Gigi, F. Glege, J. Hegeman, M. Janulis, L. Masetti, F. Meijers, E. Meschi, S. Morovic, C. Nunez-Barranco-Fernandez, L. Orsini, A. Petrucci, A. Racz, P. Roberts, H. Sakulin, C. Schwick, B. Stieger, S. Zaza, P. Zejdl
    CERN, Geneva, Switzerland
  • J.M. Andre, R.K. Mommsen, V. O'Dell, P. Zejdl
    Fermilab, Batavia, Illinois, USA
  • U. Behrens
    DESY, Hamburg, Germany
  • J. Branson, S. Cittolin, A. Holzner, M. Pieri
    UCSD, La Jolla, California, USA
  • G.L. Darlea, G. Gomez-Ceballos, C. Paus, K. Sumorok, J. Veverka
    MIT, Cambridge, Massachusetts, USA
  • S. Erhan
    UCLA, Los Angeles, California, USA
  • O. Holme
    ETH, Zurich, Switzerland
 
  WinCC Open Architecture (WinCC OA) is used at CERN as the solution for many control system developments. This product models the process variables in structures known as data points and offers a custom procedural scripting language, called Control Language (CTRL). CTRL is also the language to program functionality of the native user interfaces (UI) and is used by the WinCC OA based CERN control system frameworks. CTRL does not support object oriented (OO) modeling by default. A lower level OO application programming interface (API) is provided, but requires significantly more expertise and development effort than CTRL. The Detector Control System group of the CMS experiment has developed CMSfwClass, a programming toolkit which adds OO behavior to the data points and CTRL. CMSfwClass reduces the semantic gap between high level software design and the application domain. It increases maintainability, encapsulation, reusability and abstraction. This paper presents the details of the implementation as well as the benefits and use cases of CMSfwClass.  
poster icon Poster MOPGF025 [1.436 MB]  
 
WEPGF013 Increasing Availability by Implementing Software Redundancy in the CMS Detector Control System 1
 
  • L. Masetti, A. Andronidis, O. Chaze, C. Deldicque, M. Dobson, A.D. Dupont, D. Gigi, F. Glege, J. Hegeman, M. Janulis, R.J. Jiménez Estupiñán, F. Meijers, E. Meschi, S. Morovic, C. Nunez-Barranco-Fernandez, L. Orsini, A. Petrucci, A. Racz, P. Roberts, H. Sakulin, C. Schwick, B. Stieger, S. Zaza, P. Zejdl
    CERN, Geneva, Switzerland
  • J.M. Andre, R.K. Mommsen, V. O'Dell, P. Zejdl
    Fermilab, Batavia, Illinois, USA
  • U. Behrens
    DESY, Hamburg, Germany
  • J. Branson, S. Cittolin, A. Holzner, M. Pieri
    UCSD, La Jolla, California, USA
  • G.L. Darlea, G. Gomez-Ceballos, C. Paus, K. Sumorok, J. Veverka
    MIT, Cambridge, Massachusetts, USA
  • S. Erhan
    UCLA, Los Angeles, California, USA
  • O. Holme
    ETH, Zurich, Switzerland
 
  Funding: Swiss National Science Foundation (SNSF).
The Detector Control System (DCS) of the Compact Muon Solenoid (CMS) experiment ran with high availability throughout the first physics data-taking period of the Large Hadron Collider (LHC). This was achieved through the consistent improvement of the control software and the provision of a 24-hour expert on-call service. One remaining potential cause of significant downtime was the failure of the computers hosting the DCS software. To minimize the impact of these failures after the restart of the LHC in 2015, it was decided to implement a redundant software layer for the control system where two computers host each DCS application. By customizing and extending the redundancy concept offered by WinCC Open Architecture (WinCC OA), the CMS DCS can now run in a fully redundant software configuration. The implementation involves one host being active, handling all monitoring and control tasks, with the second host running in a minimally functional, passive configuration. Data from the active host is constantly copied to the passive host to enable a rapid switchover as needed. This paper describes details of the implementation and practical experience of redundancy in the CMS DCS.
 
poster icon Poster WEPGF013 [1.725 MB]