ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart1 CAN and LMB in ATLAS u Controls in ATLAS u CAN u Local Monitor Box u Concept u Measurements and Results u Future

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart2

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart3

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart4

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart5 Hierarchical levels of DCS Supervisor Level operator consoleshift operator, sub-system expert serverdata base, DAQ, External system Subsystem control level SCADA Local Ctrl StationGas, HV, endcap SCADA FE I/O Device Control FE I/O stand-alone systemalignment, gas analyser Fieldbus nodechamber, power supply PLCcooling, gas mixer Sensors, actuators

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart6 Requirements I/O system u Radiation (10 11 neutrons/cm 2 over 10 years outside of calorimeter) u analogue effects (e.g. loss of gain) u Single Event Upset (e.g. program corruption) u Magnetic field (1.5T in Muon, 0.1T electronics) u Access restriction u I/O points distributed over whole detector volume ( up to 100m distances) u Standardized connections to SCADA u HW: CAN, LAN u SW: CANopen, OPC, TCP/IP

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart7 CAN Fieldbus Reasons for selecting CAN: u robust u excellent error detection and recovery u open u cheap u good industry support (chips, products) u CERN recommendations

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart8 Applications of CAN Classes of applications: u Subdetector specific developments u TileCal (Clermont-Ferrand, Barcelona) u Muon (NIKHEF) u Industrial instrumentation with CAN interface u electronics crates u power supplies (HT, LT) u General purpose u modular system LMB u industrial modules

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart9 Local Monitor Box (LMB) Reasons for development of LMB: u radiation tolerance u operation in magnetic field u electrical characteristics (isolation, grounding) u high channel density u packaging u lowest possible power u high production volume (price) u common SCADA SW, only configuring needed

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart10 LMB Design Features u Radiation Tolerance u selected COTS u over-design performance, allow for degradation u operate components at lower values than specified u install at protected and accessible places u replace after n years u Operation in magnetic field u no coils, chokes, transformers, DC/DC u remote power u Limited access u remote diagnostics u remote loading of programs and reset

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart11 Concept of LMB u Modular system made out of building blocks u CAN node u I/O unit (e.g. ADC, bit I/O) u signal conditioning (e.g. range, excitation current) u add-on features (e.g. interlocks) u Different packaging (e.g. stand-alone, plug-on board, embedded on existing PCB) u Prototyping in ATLAS (in collaboration with sub- detectors), production in industry u Standard industrial interface (CAN/CANopen)

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart12 LMB block diagram

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart13 Block diagram CAN node

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart14 LMB Front-end PT100 board

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart15 LMB housing

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart16 LMB modules

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart17 Implementation of LMB u Prototype series produced ( modules) and given to all ATLAS sub-detectors ( + others) u Existing building blocks: u CAN controller module u front end I/O board u multiplexed ADC 16+7 bit, channels u digital I/O ( in preparation) u signal adaptation board u PT100 (4-wire connection) u PTx, NTC (2-wire connection) (LAr, BNL) u voltage, current adapters u interlock circuit (Pixel, Wuppertal)

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart18 Radiation tests in TCC2 Objectives: long-term stability of operation in a radiation environment behavior of components e.g. opto-couplers, EEPROM

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart19 Radiation test opto-couplers

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart20 Radiation measurement results u Opto-couplers critical u choose different type u increase circuit gain u Multiplexer problem at 50Gy u Current increase of micro-controller at 200 GY u 3 memory corruptions in SRAM (SEU) ==> more tests needed at well-known conditions (particle type, energy spectrum)

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart21 Pixel Cooling Prototype Hardware set-up: u 400 temperature sensors u 64 other ADC channels (flow, pressure, etc) u Feedback loops (ADC, DAC) u use LMB for ADC, industrial CAN modules for other functions

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart22 Pixel cooling measurement

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart23 Pixel cooling measurement

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart24 LAr Precision Temperature Measurement

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart25 LAr Precision Temperature measurement

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart26 LAr Precision Temperature measurement

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart27 Performance and features of LMB u Resolution 16 bit usable (0.8mK) u absolute accuracy 4*10 -5 (3mK) u long term stability 50ppm over one month u radiation tolerance looks achievable u weak components eliminated u more tests to be done u works in magnetic field (0.9T) u in-field programmable u CAN standard (device profile?) u low cost (2US$ per ADC channel)

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart28 Future LMB developments Additional I/O module types: u Digital I/O u DAC u Bus converters (e.g. JTAG, I 2 C) u Dedicated functions with custom programs in micro-controller

ATLAS DCS Workshop on PLCs and Fieldbusses, November 26th 1999, H.J.Burckhart29 Summary u CAN fieldbus is ATLAS’ standard to connect SCADA system to I/O system u LMB concept very suited for distributed DCS u Modularity u Necessary performance has been achieved u Projected price is “very reasonable” u LMB adopted as baseline by ATLAS’ subdetectors (also being tested by non-ATLAS groups, more users welcome)