leb 98 dcs

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Published on October 31, 2007

Author: Wen12

Source: authorstream.com

Detector Control System H.J Burckhart, CERN:  Detector Control System H.J Burckhart, CERN Motivation and Scope Detector and Requirements Architecture and Functions Front End System Practical Work Summary Motivation:  Motivation Detector is too complex to be controlled manually Each expert covers only a (small) part of the experiment Expertise gets lost with time It is important to detect problems early Possibility is needed to bring the detector automatically in a safe state Motivation (…):  Motivation (…) … and also... Find the original cause of the problem Give “forecast” of problems about to come up …and perhaps in the end… Correct problems automatically Scope:  Scope Operate the experiment in a homogenous way Control all subdetectors including magnets, cryogenics, etc. Interface to infrastructure and services electricity distribution, cooling, ventilation,cryogenics Interact with the LHC machine luminosity, background, radiation, beam dump, injection inhibit, etc. Cover the full range of operation shift operator <--> expert interaction Take care of the operational safety of detector Scope (...):  Scope (...) Present the global safety status to the operator Provide a good connection to DAQ, but keep operational independence Promote standardization amongst subdetectors resources, maintenance Enable evolution from a (small) stand-alone system to the integrated operation in the final experiment Scope (...):  Scope (...) DCS is not responsible for: safety of personal ultimate safety of equipment hardwired interlocks, PLC DCS is not concerned with physics events: monitoring of physics data quality control of physics data flow Scope (...):  Scope (...) Important rules: DCS is the mandatory tool for all actions of the operator on the detector DCS is mandatory for the presentation of all error messages and alarms to the operator Detector Organization:  Detector Organization Detector Time Scale:  Detector Time Scale R&D now “Module 0” test now  mass production 1999  (pre-) assembly 2000  calibration 2000  installation 2003  physics data taking 2005 => each phase has controls needs Selected Requirements:  Selected Requirements Only selected points which are special as compared to industrial controls are discussed here: capability for stand-alone controls of sub-systems easy integration of sub-systems in the overall system robust, minimal operation e.g. also during power cut flexible (control procedures change) basic operation independent of DAQ system good connection to DAQ (information exchange, data base, etc.) Selected Requirements (…):  Selected Requirements (…) Critical functions must be automated, no operator intervention needed intuitive user interface (no trained operators) operation of front end electronics in magnetic field radiation environment low power dissipation Architecture:  Architecture Hierarchically organized in layers (like the detector): Supervisor GUI, alarms, logging, etc. Local Control Station (LCS) autonomous supervision of part of experiment Programmable front end system PLC, Fieldbus nodes Sensors and actuators temperature, valve, etc. Architecture:  Architecture Architecture (…):  Architecture (…) Remarks: classification into ‘sub-detectors’ and ‘external systems’ onto which layer to map a of piece of hardware depends on complexity, functions needed, etc. information flow mainly up/down, not horizontally standardised LCS is the boundary between DCS and subdetectors propose also a standardised solution for front end system (Temp. Measurements, power supplies, etc.) standardise gateways for information exchange with “external system” (LHC machine, cooling/ventilation, electricity distribution, etc.) interaction with safety system only “one way” Functions:  Functions On-line status display alarm handling history plots data logging command logging incident logging Functions (...):  Functions (...) operator or event driven execution of expert-defined procedures state transition, calibration, shut down, etc. operator assistance help facility, suggestion for actions, problem analysis remote (restricted) access via network Slide17:  Functional Architecture Front End System:  Front End System Requirements: Radiation Tolerance selection of COTS over-design performance, allow for degradation operate at lower values than specified install at protected and accessible places replace after n years Operation in magnetic field no coils, chokes, transformers, DC/DC remote power Distributed cluster of I/O points Front End System (…):  Front End System (…) Solutions: Fieldbus: “simple” cable bus connecting “intelligent” nodes using a well defined protocol wide range (sensor bus, device bus, LAN) many industrial standards many industrial products (chip<->devices, drivers<-> network management) characteristics: robustness, bandwidth, topology, length, openness, determinism, bus mastership, error handling, redundancy Front End System (…):  Front End System (…) Programmable Logic Controller (PLC) simple program structure (one loop, interrupts) robust deterministic dedicated programming environment connection via LAN and/or Fieldbus proprietary flexibility limited Front End System (…):  Front End System (…) Fieldbus and PLC suited for front end system distributed I/O concentrator remote diagnostics (no access) local low level control tasks local data treatment and reduction Standardization across LHC experiments CERN selected Fieldbuses: CAN, Fip, Profibus Fieldbus nodes general purpose (ADC, digital I/O, …) purpose built (chamber controls, rack controls, …) Fieldbus devices (HT systems, crates, … ) PLC (magnets, gas, cryogenics, … ) Practical Work:  Practical Work CERN Joint Controls Project (JCOP): Collection of requirements high level architecture investigation and evaluation of commercial control system generic controls of subsystem and devices ( HV, racks, gas, … ) Fieldbus HW and SW CAN CanOpen LMB Summary :  Summary Hierarchical controls architecture Commercial solutions (HW, SW) Fieldbus and PLC very suited for lowest level Standardisation across LHC experiments (and machine !)

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