Legacy Analyzer Systems and NeSSI

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Legacy Analyzer Systems and NeSSI

• Existing analyser networks typically proprietary
• GC vendors primarily, recently adopted OPC
• Apply to only a fraction
• Rest use Cu wire
• NeSSI systems will rely on Fieldbus and Ethernet
• How do we get from dedicated hard wire and
  proprietary networks to multi-user links and open
  architecture?

Todays design
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Multi-user conduit/open architecture

• Multi-user communication paths means fiber optics
  and 100 MB/1GB Ethernet
• Difficult to justify installation by itself
• Implementation must be incremental (project by
  project)
• During transition there will be multiple user
  interfaces to the analyzers and their data
• Perseverance and clear eye on the goal is needed

Adding media converters and fiber optics to GC
network
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Future Analyzer Network
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Network Checklist

• Make friends with control systems personnel
• They will be key to supporting your system.
  Whens the last time you configured a Cisco
  router?
• Take a networking fundamentals course
• Develop a network diagram for your existing
  system
• Know that OPC servers dont automatically know
  how to talk to each other
• Consider using Analyzer OPC data specification
  developed by ExxonMobil
• Get a Black Box catalog and skim through it.
  Youll be a frequent user.
• They make Class 1, Division 2 switches!
• Find Fiber
• Control systems will have fiber optic patch
  panels somewhere in the field
• Sniff them out and draw them on a plot plan along
  with your shelters and individual analyzers
• Work with the friend you made above to get a pair
  or more of the fibers assigned to your network
• Switch your networks together
• Depending on the location and number of networks
  you may want to add a switch in the field or in
  the control room.
• Consider limitations on IP address space
• Youll need addresses, lots of them when the
  ANLAN is ready for the field.
• Public addresses will be in short supply
• Isolate your network from others for security
  reasons