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UNICOS-CPC applied to Cryogenics and specifications

This document provides an overview of the cryogenic systems in the UNICOS-CPC implementation for LHC cryogenics, including functional decomposition, control system specifications, and specification documents. It also includes a functional analysis of the process control objects and their decomposition. The document is structured in a hierarchical and descriptive format, using structured English, drawings, and diagrams.

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UNICOS-CPC applied to Cryogenics and specifications

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  1. UNICOS-CPCapplied to Cryogenics and specifications Benjamin Bradu EN-ICE-PLC February 2014

  2. Summary • UNICOS-CPC for LHC cryogenics • Overview of the cryogenic systems • Functional decomposition • UNICOS implementation • Control System Specifications • Specification documents • Functional Analysis • UNICOS-CPC Design

  3. LHC cryogenics

  4. Sector Refrigeration plant Nitrogen Tanks Dryer for adsorbers MP Buffer

  5. PLC for LHC cryogenics

  6. Refrigeration plants Refrigeration @ 1.8 K (2.4 kW @ 1.8 K) Réfrigeration @ 4.5 K (18 kW @ 4.5 K) Courtesy to L. Tavian

  7. Storage and distribution Storage Distribution Courtesy to L. Tavian

  8. Process Control Object decomposition • Identify Process Control Objects (PCO) • Defined as units or Equipment modules in IEC 61512-1 • Collection of actuators and/or other units • Can carry out a finite number of processing activities • Contains all the necessary equipments to carry out these activities • Can execute procedural sequences • Can drive other PCO • Can be driven by another PCO • A “Top PCO” is a PCO without master • Driven by operator to start/stop the complete plant • Example of PCO : • A Compression Station : 2 compressor + 4 valves

  9. Process Decomposition : Top PCOs Refrigerator @ 4.5 K MP Buffer Refrigerator @ 1.8 K Sector (Magnets) Interconnection Box

  10. Process Decomposition : 2nd PCO layer Sector Refrigeration Plant Refrigerator @ 4.5 K MP Buffer Warm Compression Station Cold-Box @ 4.5 K Cold-Box @ 1.8K Refrigerator @ 1.8 K Warm Compression station Sector (Magnets) Interconnection Box ARC Section Long Straight Section

  11. 3rd PCO layer in a compression station Pressure Control Connect Oil HP Compression Station High Stage Oil LP Boosters

  12. 3rd PCO layer in a cold-box @ 4.5K Connect CB Precooler Cold-Box @ 4.5K T23 Adsorber1 Adsorber2 Shields T45 Helium Main Flow T67 Adsorber3 T89 TA Load Interface Vaccum

  13. Ending PCO Booster 2 Hand Valves OnOff Valves Slide Valve Motor Input Valve Adsorber3 Output Valve

  14. I/O Boards Control Objects I/O Objects Field Objects UNICOS break down in PLC P Equipment Module (Compressor Station) Equipment module (Turbine 1) AI position Control Valve AO position UNIT (CRYOPLANT) Equipment module (Cold Box) Control Valve AI position AO position Equipment module (Adsorbeur) DI End switch OnOff Valve DO position O C • Device Type = Object Class • PLC instance • SCADA Instance • Equipment modules/Units • Process Control Objects (PCO) • Control modules • Field Objects • I/O acquisition • I/O Objects • Operation team must be able to act on each object • In degraded operation conditions operation crew can overcome process logic requests

  15. LHC Compressor station decomposition

  16. LHC Cold-Box Decomposition

  17. Specifications for UNICOS-CPC

  18. Specification Document Set P Requirement documents Process & Instrumentation Diagram Instrument List(1) Functional Analysis(1) Design documents UNICOS xml specification1 UNICOS Logic Templates1 Generators + PLC code SCADA objects C C 1 : Template provided by CERN-EN-ICE

  19. What is a good set of specifications? • Easy to understand for other people • Terminology/Acronyms definitions • “Comments” in documents • Easy to find particular information • Same place according to information type • Limit cross references in documents • Easy to modify • Information located at a unique place • No doubloons

  20. FunctionalAnalysis • Descriptive document • Oriented for Continuous Process Control (CPC) • Exhaustive document • No PLC language inside • No platform oriented • Structured English, drawings and diagrams can be used • Hierarchically oriented • Describe the automatic behavior of the process • General description of process • Decomposition of the process into control units • Exhaustive descriptions for each control unit • Actuator behaviors • Regulation loops • Alarms and interlocks • Possibilities given to operators

  21. Table of content of a Functional Analysis

  22. Thank you for your attention Any Questions ?

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