Experiences with SCADA packages in the LHC division

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Experiences with SCADA packages in the LHC
division

• F. Momal, CERN, Geneva

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The Control Structure
Siemens PLCs
Ethernet - Sinec H1,TCP/IP
FactoryLink on HP/UX
PCR
String Control Room
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The Control Structure
Siemens PLCs
Ethernet - Sinec H1,TCP/IP
SM18 common cryogenic facilities
String
FactoryLink on HP/UX
FL on HP/UX
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Services

• Connection to the central archiver
• Connection to the Central Alarm Server
• Connection to the GSM
• Web gateway
• Extensions to FactoryLink (XYplot, Mathwork)

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What worked well

• General stability
• Easy to install
• Easy and fast applications development
• Easy to maintain
• Easy to extend
• Product evolved according to the market
• Bugs were generally solved in the following
  release

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Problems

• Instability with the X Windows sessions.
• Impossibility to have a session at home.
• Some hardware failures.
• Hard to write reusable code.
• Backward compatibility was not perfect.
• Difficulties to debug network problems.
• Difficult to use built-in database connection

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Why changing ?

• Europeans systems were now existing.
• Market trend seemed to be drifting towards
  Windows NT.
• Windows NT stability OK.
• PCs are powerful enough.
• Windows based standard appearing (OPC).
• Cost

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Windows advantages

• Cheaper hardware, software and maintenance
• People are used to the system
• Large amount of programs to add functionality
• compilers
• drawing programs
• math tools
• Interoperability standards

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Market Surveys Criteria

• Run under Windows NT.
• Client-server and modular structure.
• Implement the mainly used automation protocol.
• Offer a complete API.
• Have an object-oriented RTDB.
• Use a standard computing language as the
  integrated programming language.
• Possible set-up using an external description
  source.
• Follow the Microsoft interoperability standards
  (OLE, ActiveX and DCOM).
• Export the archives in a standard format.
• Be European.

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Long Term Archiving
Archiver
Local Archives
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Gateways to the Supervision
Internet Oriented RTDB
Alarm Server
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The Complete Structure
Observer
Alarm Server
RealTime DataServer
Archiver
Archived Data Server
Data Description
AFS Storage