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Experiment Control Systems at the LHC

This document provides an overview of the Experiment Control Systems (ECS) utilized at the Large Hadron Collider (LHC). It focuses on the JCOP framework, detailing the protocols used within LHC experiments, including connections inside the Distributed Control System (DCS). Key communication methods such as PVSS, DIM, and TCP/IP for commands and states are discussed. Additionally, it covers hardware connectivity via OPC for power supplies, gas distribution, and other essential services. The Data Interchange Protocol (DIP) based on DIM architecture is also introduced, highlighting its significance in LHC operations.

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Experiment Control Systems at the LHC

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  1. Experiment Control Systems at the LHC An Overview of the System Architecture JCOP Framework Overview Protocols used in LHC Experiments

  2. Connections inside DCS • between and inside systems (information) • mainly internal PVSS Communication • in special cases also • DIM • bare TCP/IP • between and inside systems (commands and states) • SMI++ Joint PVSSII and JCOP Framework Course

  3. Connection to Hardware • most hardware is connected via • OPC • HV/LV power supplies • ELMB • this includes rack control • Gas Distribution • DIM • mainly special developments Joint PVSSII and JCOP Framework Course

  4. Connection to Services • The LHC Experiments, the LHC Accelerator, and the Technical Services have agreed on a Data Interchange Protocol (DIP) • During 2004 first implementations will be available. DIP will be based on the DIM architecture. Joint PVSSII and JCOP Framework Course

  5. DIP DIP PVSS DIP PVSS PVSS PVSS PVSS PVSS PVSS DIM OPC OPC Generic SW Architecture Control Units ECS? T.S. LHC DAQ DSS DCS ??? Abstract levels ... ... Commands GAS Status & Alarms DetDcs1 DetDcsN DetDaq1 SubSys1 SubSys2 SubSysN Device Units Dev1 Dev2 Dev3 DevN To Devices (HW or SW) Joint PVSSII and JCOP Framework Course

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