The Ground Test Accelerator Required Support from Test ...
EPICS Experimental Physics and Industrial Control System (EPICS) Overview Bob Dalesio LANL 1999/Ph 514: EPICS Overview 1 Outline EPICS Introduction: What is EPICS The Collaboration Software / Hardware Architecture The Client/Server Model over the Channel Access Protocol
A Look at the Principal Data Store - Process Database A Look at Some Channel Access Clients Display Managers (EDD/DM and MEDM) Alarm Handler State Notation Language Conclusions 1999/Ph 514: EPICS Overview 2 Introduction: What is EPICS? EPICS A collaboration of the controls groups of many research organizations that use the EPICS tool-kit. A distributed architecture that supports a wide range of solutions from small test stands to large integrated facilities. A set of tools that reduces software application and maintenance costs by providing: Configuration tools in place of programming A large installed base of tested software A modular design that supports incremental upgrades
Well defined interfaces for extensions at every level 1999/Ph 514: EPICS Overview 3 The EPICS Collaboration EPICS Over 100 independent projects in North America, Europe and Asia Applications in particle physics, astronomy, and industrial control Distribute software over the network Independent development, co-development and incremental development of code done by members Problem reporting and resolution via e-mail exploders Documentation available on WWW sites Large collaboration meetings to report new work, discuss future directions, explore new applications, and explore new requirements
for existing codes Small design groups from multiple labs meet to discuss design issues on significant codes: Channel Access, CDEV, Archiving and MMI 1999/Ph 514: EPICS Overview 4 Accelerator Programs Using EPICS EPICS The Advanced Photon Source and Beamlines @ ANL The Thomas Jefferson National Accelerator Facility @ Newport
News, Va. Proton Storage Ring @ LANSCE Injection Linac for KEKB Factory @ KEK Advanced Free Electron Laser @ LANL Duke Free Electron Laser and Mark III Laser @ Duke University Heavy Ion Fusion Test Stand @ LBL Intense Pulsed Neutron Source @ ANL HERA Cryogenic Plant and Tesla Test Facility @ DESY RF and Beamline Control for the B-Factory @ SLAC Bates Linear Accelerator @ Bates MIT Racetrack Microtron @ University of Athens BESSY II @ BESSY 1999/Ph 514: EPICS Overview 5 Astronomy Programs Using EPICS EPICS Gemini 8 Meter Telescopes @ NOAO (Hawaii, Chile)
Kitt Peak Observatory @ NOAO (Arizona) William Herschel Telescope @ La Palma (Canary Islands) United Kingdom Infrared Telescope @ JAC (Hawaii) LIGO @ Cal Tech GWFD @ Japanese National Large Telescope Keck II @ CARA (Hawaii) 1999/Ph 514: EPICS Overview 6 Detector Programs Using EPICS EPICS PHENIX Detector @ RHIC STAR Detector @ RHIC Detector Halls A, B & C @ TJNAF Gammasphere @ LBL Babar Detector @ PEP II D0 @ FNAL 1999/Ph 514: EPICS Overview
7 Industrial Use of EPICS EPICS GM Fuel Cell Test Stand @ LANL Agile Manufacturing Plant @ Allied Signal Plant Simulation @ Knolls Atomic Power Laboratory Flight Simulation @ Jet Propulsion Laboratory Liquefied Natural Gas Plant @ BG & E Western Lake Superior Waste Water Treatment Plant St. Louis County - Potable Water Distribution Network Bechtel-Parsons-Brinkerhoffs Fire Ventilation Test Facility The Advanced Micro Devices Wafer Fabrication - Clean Room Citgo Oil Product Storage and Movement Facility
Saphania Oil Field Well Head and Extraction Las Vegas - Potable Water Distribution Network 1999/Ph 514: EPICS Overview 8 Data Acquisition Commercial Applications EPICS Pratt & Whitney Engine Test Facility Lockheed Martin NASA Langley Wind Tunnel United Technologies Engine Test Facility McDonnell Douglas Component Test Facility 1999/Ph 514: EPICS Overview 9 Project Status Throughout the Collaboration
Jlab 180,000 81 IOCs 30 ws Mostly reliable* * Jlab has software problems under 1% of downtime - mostly at restart. Hardware problems are still over budget (2%) with power supplies and Bira Crate Controllers. *APS has one IOC loss every 2 weeks - tracking down. Under 1% down time. 1999/Ph 514: EPICS Overview 10 Distributed Architecture EPICS EPICS is physically a flat architecture of front-end controllers and operator workstations that communicate via TCP/IP and UDP System scales through the addition of new computers Physical hierarchy is made through bridges, routers, or a gateway Network bandwidth is the primary limiting factor EPICS software architecture is client/server based - with independent data stores providing read/write access directly
between any two points Local name services mean automatic integration of new components Point-to-point communication supports automation 1999/Ph 514: EPICS Overview 11 Distributed Hardware Configuration EPICS Workstations: Sun HP DEC/Alpha Silicon Graphics PC I/O Controllers: VME, VXI, PCI, ISA Remote I/O and Signal Conditioning: Field I/O
Field I/O Field I/O Field I/O CAN-Bus, Industry Pack VME, VXI, PCI, ISA CAMAC, GPIB Profibus, Bitbus, Serial Allen-Bradley, Modbus 1999/Ph 514: EPICS Overview 12 Standard Operating System Software Configurations EPICS Workstations OS: SunOS, Solaris HPUX DEC-UNIX SGIX Windows NT Linux I/O Controllers OS:
vxWorks Field I/O 1999/Ph 514: EPICS Overview Field I/O Field I/O Field I/O 13 Distributed Software Architecture vxWorks, UNIX WindowsNT, VMS vxWorks WindowsNT Solaris CDEV UNIX ca-client
ca-server EPICS ca-client ca-server CORBA ACE vxWorks only process DB device sup 1999/Ph 514: EPICS Overview 14 Many tools are available in the EPICS tool-kit EPICS
EPICS tools are connected via the Channel Access client/server libraries Server Interfaces: Process Database Gateway (CA-Client - GDD Library - Portable server on Solaris) Client Interfaces Process Database Links Sequencer (programmed with State Notation Language) Data Visualization Packages Data Analysis Packages Modeling and Automation Packages 1999/Ph 514: EPICS Overview 15 EPICS Channel Access Client/Server Libraries Operator Interface Sequencer Channel Access Client Channel Access Client LAN/WAN
Database Links Channel Access Client TCP/IP & UDP Channel Access Server EPICS Process Database Client: Provides read/write connections to any subsystem on the network with a channel access server Server: Provides read/write connections to information in this node to any client on the network through channel access client calls Services: Dynamic Channel Location, Get, Put, Monitor Access Control, Connection Monitoring, Automatic Reconnect Conversion to client types, Composite Data Structures Platforms: UNIX, vxWorks, VMS (Client only), Windows NT 1999/Ph 514: EPICS Overview 16 EPICS Channel Access Operator Interface Sequencer Channel Access Client
Channel Access Client Database Links Channel Access Client TCP/IP & UDP LAN/WAN Performance: 68040 over 10 Mbit Ethernet Channel Access Server Gets EPICS Process Database Propagation Delay 2 mS Throughput 7.8K /sec Puts Propagation Delay 1 mS Throughput 17K /sec Monitors Propagation Delay Dependent Throughput 10K / sec (Typically 10% channels have monitors) (memory use in IOC - 2 Meg / 60 connections) (30% network load for 10K monitors / second)
Increase bandwidth with Routers, Bridges, Higher speed networks and EPICS gateway 1999/Ph 514: EPICS Overview 17 EPICS Process Database Provides Data Acquisition and Control EPICS LAN ca-client ca-server process DB dev support A Channel Access server provides connection, get, put, and monitor services to this database A Channel Access client provides access to process DBs in other IOCs Record types are the basic elements: AI, AO, BI, BO, Motor, CALC, PID, SUB etc. Records consist of fields for: SCHEDULE, I/O, CONVERT, ALARM, MONITOR Fields hold runtime values: VALUE, TIMESTAMP, ALARM CONDITION, etc. New record types are easily added Configured using CAPFAST, GDCT, JDCT, Relational DB, Text Editor at the
workstation Loaded as ASCII records into vxWorks at boot time Most fields can be read/written through the channel access client interface during operation 1999/Ph 514: EPICS Overview 18 EPICS Process Database EPICS LAN ca-client ca-server process DB dev support Record execution time varies from record type to record type AI on a 68060 is ~12,000/second (50% idle) AI on a 68040 is ~6,000/second (50% idle) Fastest periodic scan rate is dependent on vxWorks clock tick (typically 60 Hz) Interrupt scanning is limited by the CPU bandwidth (interrupt delay ~33usec) Name resolution - 10,000/second - runs at the lowest priority 2,500 records use around 1 Megabyte of memory Assignment to particular physical I/O is distinct from process logic - ASCII device type 1999/Ph 514: EPICS Overview
19 Channel Access Client Codes Provide a Variety of Functionality EPICS Operator Interface Channel Access Client LAN Visualization: EDD/DM, MEDM, Dataviews, SL-GMS, tcl/TK, Visual Basic, Visual C++, Labview, IDL, SAMMI JAVA Alarm Handler: ALH State Programming: SNL Other Clients: PV-Wave, Mathmatica, Matlab, Probe, Orbit Lock, Correlation Plots, Striptool, X-Orbit, SAD, CNLS-net SDDS, ARTEMIS, Archivers, Save/Restore 1999/Ph 514: EPICS Overview 20 EDD/DM An Interactive Display Editor and High Performance Display Manager Operator Interface Channel Access Client
LAN EPICS The Channel Access Client provides name resolution, monitors and puts to any data stores with a CA server EDD is an interactive display editor for creating operator screens DM is a display manager to activate screens created using EDD Connections are made to channels - typically record-name<.field-name> DM monitors channels and only updates the screen when there are changes Monitors from channel access are cached - not queued ASCII display formats can be read/written for version upgrades/text editing 1999/Ph 514: EPICS Overview 21 EDD/DM An Interactive Display Editor and High Performance Display Manager Operator Interface Channel Access Client LAN EPICS The Channel Access Client provides name resolution, monitors and puts to any data stores with a CA server
Static objects include: text, line, box, oval Monitor objects include: text, bars, meters, indicators Control objects include: text, slider, menu, buttons Plot objects include: strip chart, Cartesian plots, smith charts Related display call-up includes parameter passing Color Rules are available for all objects independent of dynamic channel Visibility modifiers are available for static objects DM does 2,000 updates per second on a SPARC IPC 2 second display call-up for 100 dynamic and 1000 static elements 1999/Ph 514: EPICS Overview 22 The Alarm Handler Alarm Viewing, Logging and Annunciation Operator Interface Channel Access Client LAN EPICS The Channel Access Client provides name resolution, monitors alarm changes, writes group alarm status Alarms are detected in the data stores - most commonly the process database Alarms are configured into an alarm hierarchy Logging, annunciation, acknowledgment and collection is configured for each group
All lower levels of the hierarchy inherit the disable status from above Operator logging tracks alarm disable, alarm acknowledge and silence commands 500 Alarm condition changes per second can be handled on a SPARC IPC 1999/Ph 514: EPICS Overview 23 State Notation Language A State Machine Implementation in EPICS Operator Interface Channel Access Client LAN EPICS The Channel Access Client provides name resolution, monitors and writes to state programs SNL is preprocessed to be converted to C code Constructs are provided for easy channel access interface Construct are provided to define state programs, state sets and transitions SNL implements the Mealy Model - actions are only taken on transition SNL runs in the vxWorks environment Events are supported for synchronizing state sets within a state program SNL does not have a server The process database is used for variables to be exported 1999/Ph 514: EPICS Overview
24 New Developments EPICS New developments take advantage of changes in technology and improve functionality, ease of use, and performance while reducing cost Support large user facilities with real-time data to hundreds of workstations through the development of a gateway (ANL/LANL) Provide the ability to add/delete records in the process database during operation to support continuous operations (KEK/LANL/ANL) Support a single computer solution for small experiments and small portions of larger installations (DESY/LANL)
Provide native windows NT capabilities to lower cost and provide data to every desktop (LANL) Create a modern JAVA based MMI attempting to maintain the performance while increasing the functionality and ease of use (LANL L-12) Provide a distributed archiving/archive retrieval capability to better support analysis and operations (TJNAF/LANL/DESY) 1999/Ph 514: EPICS Overview 25 EPICS Collaboration : Cooperative Development of a Scaleable, Flexible Tool-kit EPICS The fundamental performance and functionality is scaleable and easily configured Clean interfaces for clients, new record types, data stores and hardware promote independent development, support ease of
reintegration, and protect against obsolescence Cooperative collaboration gives members laboratories a larger pool of talent to support their controls Continual improvements allow members to expand functionality, performance, reliability and function while taking advantage of latest technology 1999/Ph 514: EPICS Overview 26
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