ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart1 CAN and LMB in...

Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart

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ATLASDCS CAN and LMB in ATLASCAN and LMB in ATLAS

Controls in ATLAS CAN Local Monitor Box

Concept Measurements and Results Future


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ATLASDCS


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ATLASDCS


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ATLASDCS


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ATLASDCS

Hierarchical 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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ATLASDCS

Requirements 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 (1.5T in Muon, 0.1T electronics) Access restriction I/O points distributed over whole detector volume

( up to 100m distances) Standardized connections to SCADA

HW: CAN, LAN SW: CANopen, OPC, TCP/IP


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ATLASDCS

CAN FieldbusCAN Fieldbus

Reasons for selecting CAN: robust excellent error detection and recovery open cheap good industry support (chips, products) CERN recommendations


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ATLASDCS

Applications of CANApplications of CAN

Classes of applications: Subdetector specific developments

TileCal (Clermont-Ferrand, Barcelona) Muon (NIKHEF)

Industrial instrumentation with CAN interface electronics crates power supplies (HT, LT)

General purpose modular system LMB industrial modules


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ATLASDCS

Local Monitor Box (LMB)Local Monitor Box (LMB)

Reasons for development of LMB: radiation tolerance operation in magnetic field electrical characteristics (isolation, grounding) high channel density packaging lowest possible power high production volume (price) common SCADA SW, only configuring needed


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ATLASDCS

LMB Design FeaturesLMB Design Features Radiation Tolerance

selected COTS over-design performance, allow for degradation operate components 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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ATLASDCS

Concept of LMBConcept of LMB

Modular system made out of building blocks 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

Standard industrial interface (CAN/CANopen)


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ATLASDCS

LMB block diagramLMB block diagram


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ATLASDCS

Block diagram CAN nodeBlock diagram CAN node


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ATLASDCS

LMB Front-end PT100 boardLMB Front-end PT100 board


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ATLASDCS

LMB housingLMB housing


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ATLASDCS

LMB modulesLMB modules


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ATLASDCS

Implementation 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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ATLASDCS

Radiation tests in TCC2Radiation tests in TCC2

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


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ATLASDCS

Radiation test opto-couplersRadiation test opto-couplers


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ATLASDCS

Radiation measurement resultsRadiation measurement results

Opto-couplers critical choose different type increase circuit gain

Multiplexer problem at 50Gy Current increase of micro-controller at 200 GY 3 memory corruptions in SRAM (SEU)

==> more tests needed at well-known conditions (particle type, energy spectrum)


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ATLASDCS

Pixel Cooling PrototypePixel Cooling Prototype

Hardware set-up: 400 temperature sensors 64 other ADC channels (flow, pressure, etc) Feedback loops (ADC, DAC) use LMB for ADC, industrial CAN modules for

other functions


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ATLASDCS

Pixel cooling measurementPixel cooling measurement


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ATLASDCS

Pixel cooling measurementPixel cooling measurement


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ATLASDCS

LAr Precision Temperature LAr Precision Temperature MeasurementMeasurement


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ATLASDCS

LAr Precision Temperature LAr Precision Temperature measurementmeasurement

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

pera

ture

(K) PRT

PT5

PRT- PT5Mean = -3.1 mKStdev = 0.9 mK


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ATLASDCS

LAr Precision Temperature LAr Precision Temperature measurementmeasurement

0

100

200

300

400

500

600

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

Freq

uenc

y

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


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ATLASDCS

Performance and features of LMBPerformance and features of LMB

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

weak components eliminated more tests to be done

works in magnetic field (0.9T) in-field programmable CAN standard (device profile?) low cost (2US$ per ADC channel)


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ATLASDCS

Future LMB developmentsFuture LMB developments

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

micro-controller


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ATLASDCS

SummarySummary

CAN fieldbus is ATLAS’ standard to connect SCADA system to I/O system

LMB concept very suited for distributed DCS Modularity Necessary performance has been achieved Projected price is “very reasonable” LMB adopted as baseline by ATLAS’ subdetectors

(also being tested by non-ATLAS groups, more users welcome)

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ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart1 CAN and LMB in...

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