Supervisory Control & Data Acquisition - Communication Technology

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Supervisory Control & Data Acquisition - Communication Technology

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Control the flow of information security, accessibility, data control Centralize resources save cost on local work stations and peripherals Simplify data / software management Backups, IS maintenance Share information with multiple users Distribute tasks reduce local need CPU power Master / Slave (Similar to the teacher- student relationship) Peer to Peer (Similar to the workgroup concept) Client / Server (Similar to an automated teller transaction)

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Nội dung Text: Supervisory Control & Data Acquisition - Communication Technology

  1. Supervisory Control & Data Acquisition Communication Technology
  2. •Seriplex FAQ Which Network Do I Use? •CAN FAQ •Interbus S FAQ Modbus •IBS club •WorldFIP Interbus S Modbus Plus •LON works •Modbus ASI Profibus •Fieldbus compare •Honeywell Echelon •Control competition CAN Ethernet Device Net SDS Seriplex
  3. What is a Network ?  A group of devices physically connected together for the purpose of sharing information, resources and a common transmission medium.
  4. Why do you need a network?  Control the flow of information • security, accessibility, data control  Centralize resources • save cost on local work stations and peripherals  Simplify data / software management • Backups, IS maintenance • Share information with multiple users  Distribute tasks • reduce local need CPU power
  5. What makes a network work ?  Computers, printers …...  Network interface cards  Network adapter Software drivers  Network Cabling  Network protocols
  6. The Basic Types of Networks Master / Slave (Similar to the teacher- student relationship) Peer to Peer (Similar to the workgroup concept) Client / Server (Similar to an automated teller transaction)
  7. Master / Slave Network  Central Control and Administration  Central Processing of Information  Polling of Stations Master Slave Slave Slave
  8. Peer To Peer Network  Distributed Administration  Independent Processing of Information  Shared Transmission Medium
  9. Client / Server Network  Central Network Administrator  Controlled Flow of Information  Independent Processing of Information  Shared Transmission Medium
  10. How is a network put together ?  The OSI model uses 7 layers to categorized the main elements of a basic network Application Layers Designed Presentation for Data Processing Session Transport Network Layers Designed for Communications Datalink Layer Physical Medium
  11. OSI Model Layers  A Model is used to ensure Compatibility  Each station utilizes the same Protocol Stack Application Application Presentation Presentation Session Session Transport Transport Network Network Datalink Layer Datalink Layer Physical Medium Physical Medium
  12. OSI Model: Flow of Data  Logical Structure  Data Multiplexing Application Application Presentation Presentation Session Session Transport Transport Network Network Datalink Layer Datalink Layer Physical Medium Physical Medium
  13. Hardware / Software integration  The upper five layers are implemented with software  The lower two layers are implemented with hardware Application Software Layers Presentation Session Transport Network Hardware Layers Datalink Layer Physical Medium
  14. OSI Model vs. Ethernet -TCP/IP  Ethernet does not incorporate all 7 layers because it’s development predated the OSI model Application Presentation Session Application Transport Transmission Control Network Internet Protocol Datalink Layer CSMA - CD Physical Medium Twisted Pair/ Fiber Optics CDMA/CD – Carrier Sense Multiple Access with Collision Detection
  15. OSI Model vs. Field Bus Model  The typical field bus only utilizes 3 layers. The functions of the other layers are either built into the ASIC chip or the application layer Application Presentation Session Transport Network Application Datalink Layer ASIC Dependent Physical Medium Multiple Mediums ASIC - Application-Specific Integrated Circuit
  16. What is common to all networks ?  Application message - dependent on software package • The message is created by the application package  Media Access Control • The procedure for sharing the physical medium  Logical Topology • The associations between the devices  Physical Topology • The layout of all the device connections  Transmission Mediums • The physical path used between the devices
  17. Various Transmission Mediums  Coaxial Cable Jacket of PVC or Teflon Jacket made of PVC or Teflon  Twisted Pair  Optical Fiber  Wireless
  18. Basic Physical Topologies  Bus Topology  Star Topology  Ring Topology  Free Topology  Hybrid Topology
  19. Bus Architecture Topology  Single Channel - Broadcast oriented • More delicate to maintain signal integrity based on cable selection, distance and drops/taps
  20. Star Architecture Topology  Central Hub • multi-port repeater – Loose star = lost network • channel selecting switch

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