Difference between revisions of "OWG meeting 31-Jan-2008"

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=Agenda=
 
=Agenda=
 
* Review of minutes from [[OWG meeting 14-Dec-2007|14-Dec-2007]] meeting
 
* Review of minutes from [[OWG meeting 14-Dec-2007|14-Dec-2007]] meeting
−
* Electronics diagrams - Chris
+
* [[Media:HallD_Online_Electronics_31-JAN-2008.pdf|Electronics diagrams]] - Chris
 
* Update on event size study - David for Eugene (who is out of town)
 
* Update on event size study - David for Eugene (who is out of town)
 
* Experiment controls (see also [[Experiment Control System Choice]]) - Vardan
 
* Experiment controls (see also [[Experiment Control System Choice]]) - Vardan
Line 46: Line 46:
  
 
'''Chris Cuevas showed the latest electronics diagrams'''
 
'''Chris Cuevas showed the latest electronics diagrams'''
 +
 +
* Chris showed some new drawings, many things moving well along
 +
* Chris showed the latest crate, FADC, and F1TDC counts
 +
* Lots of progress defining newer systems such as TS crate
 +
* ATCA may be an interesting alternative for the global sum crate (more on ATCA at the next meeting...)
 +
* Chris reviewed milestone status
 +
* Four more FADC250's coming, VXS testing continues
 +
* 12-bit is our standard for the FADC250
 +
* Now have some space in Stan's lab downstairs
 +
* TI design in progress
 +
* New hire starting to work on clock and trigger distribution
 +
* Collecting specs for F1TDC version 2
 +
* Crate sum design and prototyping going well
 +
* 12-bit FADC requires front-end redesign to use new chip...current one runs too hot
 +
* All drawings will follow Hall D official numbering scheme
 +
* Need network diagrams, location of patch panels, routes, etc.
 +
* More work needed on cable routes, rack layouts, etc. taking maintainability into account
 +
* Three crates per rack seems ok
  
  
 
'''Dave Lawrence reported for Eugene Chudakov on progress in the event size study'''
 
'''Dave Lawrence reported for Eugene Chudakov on progress in the event size study'''
 +
 +
* Low and high energy photon parts now combined in a single MC generator
 +
* Threshold to about 3 GeV comes from cross section tables, above 3 GeV is Pythia
 +
* MC includes coherent bremstrahlung spectrum
 +
* Still needs realistic trigger algorithm
 +
* Chinese group will arrive end of March and may work on event size study
  
  
 
'''Vardan Gurjyan told us about AFECS, the JLab DAQ group experiment controls framework'''
 
'''Vardan Gurjyan told us about AFECS, the JLab DAQ group experiment controls framework'''
 +
 +
* AFECS == Agent Framework for Experiment Controls Systems
 +
* Includes finite state machines (FSM's)
 +
* Allows interoperation of hardware and software in a control system
 +
* Allows integration of DAQ, run control, slow controls, etc.
 +
* Talking to a component involves talking to its agent using a uniform API for all agents
 +
* Allows scalability since only the agent needs a driver, and so some bottlenecks can be avoided
 +
* Allows hiearchical design including FSM's at any level
 +
* Supports many protocols (cMsg, CA, OPC, SNMP, etc)
 +
* Written in pure Java
 +
* Web-based monitoring component exists
  
  
 
'''Elliott presented preliminary choices for controls field busses and controller protocols'''
 
'''Elliott presented preliminary choices for controls field busses and controller protocols'''
 +
 +
* This is the bottom of a three-layer proposed controls hierarchy
 +
* Goal is to minimize number of field bus types, use Ethernet whenever possible
 +
* Allen-Bradley PLC will be used for solenoid, target, gas systems, experiment cooling systems, perhaps other systems
 +
* Operator gui's will have uniform look-and-feel, so Allen-Bradly HMI (gui builder) will only be used for expert screens
 +
* Elliott proposes extensive use of OPC (world standard for talking to controllers), but also SNMP and others
 +
* Will have CAN-bus and I2C
 +
* See [[Field Bus and Controller Specifications]] for full list of bus/controller choices
  
  
 
'''Elliott proposed Linux-only EPICS for the slow controls layer in the Hall D control system'''
 
'''Elliott proposed Linux-only EPICS for the slow controls layer in the Hall D control system'''
 +
 +
* Elliott attended two ICALEPCS conferences since 2002 and learned about possibilities there
 +
* Viable alternatives are:  EPICS, PVSSII, DOOCS/TINE, and Tango
 +
* None appear to be compelling alternatives to EPICS at this time
 +
* Elliott proposed world-standard Linux-only EPICS for the middle control layer
 +
* EPICS seems to be rapidly developing, has embraced Java, and old utilities are being replaced with modern versions
 +
* EPICS community seems strong and growing, and is interested in modernization
 +
* Eclipse-based Control System Studio seems like a good alternative to MEDM, DM, etc, and allows for much improved functionality
 +
* Concerns about whether promising new development will pan out
 +
* See [[Slow Controls Framework Choice]] for more details

Latest revision as of 15:31, 6 February 2008

Agenda


Time/Location

Note change from usual date/time: 10am Thurs 31-Jan-2008 CC F326
(Fri 1-Feb-2008 is tracking review all day)


To connect by telephone:

1) dial:
+1-800-377-8846 : US
+1-888-276-7715 : Canada
+1-302-709-8424 : International

2) enter participant code: 39527048# (remember the "#")


Announcements

Next Meeting

Fri 15-Feb-2008 2pm CC F326


New Action Items from this Meeting

  • Use full-scale FDC test as testbed for controls system.


Minutes

Attendees: Dave L, Dave A, Dave D, Elke, Vardan, Chris C, Fernando, Elliott.


Chris Cuevas showed the latest electronics diagrams

  • Chris showed some new drawings, many things moving well along
  • Chris showed the latest crate, FADC, and F1TDC counts
  • Lots of progress defining newer systems such as TS crate
  • ATCA may be an interesting alternative for the global sum crate (more on ATCA at the next meeting...)
  • Chris reviewed milestone status
  • Four more FADC250's coming, VXS testing continues
  • 12-bit is our standard for the FADC250
  • Now have some space in Stan's lab downstairs
  • TI design in progress
  • New hire starting to work on clock and trigger distribution
  • Collecting specs for F1TDC version 2
  • Crate sum design and prototyping going well
  • 12-bit FADC requires front-end redesign to use new chip...current one runs too hot
  • All drawings will follow Hall D official numbering scheme
  • Need network diagrams, location of patch panels, routes, etc.
  • More work needed on cable routes, rack layouts, etc. taking maintainability into account
  • Three crates per rack seems ok


Dave Lawrence reported for Eugene Chudakov on progress in the event size study

  • Low and high energy photon parts now combined in a single MC generator
  • Threshold to about 3 GeV comes from cross section tables, above 3 GeV is Pythia
  • MC includes coherent bremstrahlung spectrum
  • Still needs realistic trigger algorithm
  • Chinese group will arrive end of March and may work on event size study


Vardan Gurjyan told us about AFECS, the JLab DAQ group experiment controls framework

  • AFECS == Agent Framework for Experiment Controls Systems
  • Includes finite state machines (FSM's)
  • Allows interoperation of hardware and software in a control system
  • Allows integration of DAQ, run control, slow controls, etc.
  • Talking to a component involves talking to its agent using a uniform API for all agents
  • Allows scalability since only the agent needs a driver, and so some bottlenecks can be avoided
  • Allows hiearchical design including FSM's at any level
  • Supports many protocols (cMsg, CA, OPC, SNMP, etc)
  • Written in pure Java
  • Web-based monitoring component exists


Elliott presented preliminary choices for controls field busses and controller protocols

  • This is the bottom of a three-layer proposed controls hierarchy
  • Goal is to minimize number of field bus types, use Ethernet whenever possible
  • Allen-Bradley PLC will be used for solenoid, target, gas systems, experiment cooling systems, perhaps other systems
  • Operator gui's will have uniform look-and-feel, so Allen-Bradly HMI (gui builder) will only be used for expert screens
  • Elliott proposes extensive use of OPC (world standard for talking to controllers), but also SNMP and others
  • Will have CAN-bus and I2C
  • See Field Bus and Controller Specifications for full list of bus/controller choices


Elliott proposed Linux-only EPICS for the slow controls layer in the Hall D control system

  • Elliott attended two ICALEPCS conferences since 2002 and learned about possibilities there
  • Viable alternatives are: EPICS, PVSSII, DOOCS/TINE, and Tango
  • None appear to be compelling alternatives to EPICS at this time
  • Elliott proposed world-standard Linux-only EPICS for the middle control layer
  • EPICS seems to be rapidly developing, has embraced Java, and old utilities are being replaced with modern versions
  • EPICS community seems strong and growing, and is interested in modernization
  • Eclipse-based Control System Studio seems like a good alternative to MEDM, DM, etc, and allows for much improved functionality
  • Concerns about whether promising new development will pan out
  • See Slow Controls Framework Choice for more details
Retrieved from "https://halldweb.jlab.org/wiki/index.php?title=OWG_meeting_31-Jan-2008&oldid=6904"