DCS TCSG November 10th 1999, H.J.Burckhart1 Status of the general purpose I/O system LMB u DCS Architecture u LMB u Local Monitor Box (LMB) u Concept u

TCSG November 10th 1999, H.J.Burckhart

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DCS

Status of the general purpose Status of the general purpose I/O system LMBI/O system LMB

DCS Architecture LLocal MMonitor BBox (LMB)

Concept Measurements and Results Future


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DCSSubdetectorsSubdetectors


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DCSDetector organizationDetector organization

Hierarchical organisation of quasi independent units (“objects”) Separation for various reasons (organisational, operational,

geometrical, etc.) Units have to operate stand-alone and integrated Data flow mainly vertically

Common Infrastructure handled like a subdetector


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DCSDCS ArchitectureDCS Architecture


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DCSHierarchical levels of DCSHierarchical levels of DCS

Supervisor Leveloperator console shift operator, sub-system expertserver data base, DAQ, External system

Subsystem control levelLocal Ctrl Station Gas, HV, endcap

SCADASCADA

--------------------------------------------------------------------------------Device Control FE I/OFE I/O

stand-alone system alignment, gas analyserFieldbus node chamber, power supplyPLC cooling, gas mixer

Sensors, actuators


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DCSRequirements I/O systemRequirements I/O system

Radiation (1011 neutrons/cm2 over 10 years outside of calorimeter) analogue effects (e.g. loss of gain) Single Event Upset (e.g. program corruption)

Magnetic field (up to 1000 Gauss in UX15 racks) Access restriction I/O points distributed over whole detector volume

( up to 100m distances) Standardized connections to SCADA

HW: Fieldbus, LAN SW: OPC, TCP/IP


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DCSFront-end I/O systemFront-end I/O system

Separation in Sub-detector specific and General Purpose I/O system

Reasons for General Purpose I/O system: needed for monitoring common infrastructure radiation tolerance high production volume (price) maintenance interfacing to SCADA common software, only configuring needed


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DCSConcept of LMBConcept of LMB

Modular system made out of building blocks (original idea from NIKHEF) CAN node I/O unit (e.g. ADC, bit I/O) signal conditioning (e.g. range, excitation current) add-on features (e.g. interlocks)

Different packaging (e.g. stand-alone, plug-on board, embedded on existing PCB)

Prototyping in ATLAS (in collaboration with sub-detectors), production in industry

Industrial standard (CAN)


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DCSLMB Design FeaturesLMB Design Features

Radiation Tolerance selected 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

Limited access remote diagnostics remote loading of programs and reset


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DCSImplementation of LMBImplementation of LMB

Prototype series produced (40 + 100 modules) and given to all ATLAS sub-detectors ( + others)

Existing building blocks: CAN controller module front end I/O board

multiplexed ADC 16+7 bit, 16-64 channels digital I/O ( in preparation)

signal adaptation board PT100 (4-wire connection) PTx, NTC (2-wire connection) (LAr, BNL) voltage, current adapters

interlock circuit (Pixel, Wuppertal)


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DCSLMB block diagramLMB block diagram


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DCSLMB Front-end boardLMB Front-end board


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DCSLMB prototypeLMB prototype


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DCSRadiation measurementsRadiation measurements

1998 in TCC2, LMB not powered 79 days, 200 Gy, 2*1012 neutrons/cm2

2 EEPROM cells changed substantial gain loss of opto-couplers

1998 at PROSPERO reactor, neutrons < 4 MeV, LMB read out 5 hours, 9*1012 neutrons/cm2

substantial gain loss of opto-couplers


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DCSRadiation measurements (cont.)Radiation measurements (cont.)

1999 in TCC2, LMB read out 80 days, 200Gy, 2*1012 neutrons/cm2

different opto-couplers (see plot) some multiplexer failed after 75 Gy increased power consumption and some functional

problems after 125 Gy and 1012 neutrons/cm2

3 cases of program corruption, power on/off cured problem


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DCSRadiation tests in TCC2Radiation tests in TCC2

Objectives:•long-term stability of operation in a radiation environment•behavior of components e.g. optos, EEPROM


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DCSRadiation test opto-couplersRadiation test opto-couplers


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DCSLAr High Precision Temp. Meas.LAr High Precision Temp. Meas.


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DCSPrecision Temperature measurementPrecision Temperature measurement

PRT and PT5 10/7 1998

90.04

90.05

90.06

90.07

90.08

90.09

90.10

90.11

14:33 14:43 14:53 15:03 15:13 15:23

Time (h)

Tem

pe

ratu

re (

K) PRT

PT5

PRT- PT5Mean = -3.1 mKStdev = 0.9 mK


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DCSPrecision Temperature measurementPrecision Temperature measurement

0

100

200

300

400

500

600

-10 -8 -6 -4 -2 0 2 4 6 8 10 12 14 (mK)

Fre

qu

en

cy

Date: 21 July 1998Time: 15:00 to 24:00hSample period: 30sSensors: PTR and PT5MEAN = 1.0 mKStdev = 1.2 mK


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DCSPixel Cooling SystemPixel Cooling System

some 100 temperature sensors some 10 other ADC channels (flow, pressure, etc) Feedback loops (ADC, DAC) use LMB for ADC, industrial CAN modules for

rest


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DCSPerformance and features of LMBPerformance and features of LMB

Resolution 16 bit (0.8mK) absolute accuracy 4*10-5 (3mK) long term stability 50ppm over one month radiation tolerance basically ok

weak components eliminated final test to be done

works in magnetic field (9kG) in-field programmable CAN standard low cost (2US$ per ADC_chan)


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DCSFuture LMBFuture LMB

Further developments: Digital I/O DAC Bus converters (e.g. JTAG, I2C) Dedicated functions with custom programs in

micro-controller


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DCSSummarySummary

LMB concept very suited for distributed DCS Necessary performance achieved Projected price “very reasonable” LMB adopted as baseline by some subdetectors LMB review started (Web: ATLAS->T/DAQ->DCS) Questions to subdetectors:

what application what type of modules number of channels, granularity packaging (stand alone, plug-on, embedded) time scale

Documents

DCS TCSG November 10th 1999, H.J.Burckhart1 Status of the general purpose I/O system LMB u DCS Architecture u LMB u Local Monitor Box (LMB) u Concept u