Supervisory Control & Data Acquisition - Communication Technology

Control the flow of informationsecurity, accessibility, data controlCentralize resourcessave cost on local work stations and peripheralsSimplify data / software managementBackups, IS maintenanceShare information with multiple usersDistribute tasksreduce local need CPU powerMaster / 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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Supervisory Control & Data Acquisition - Communication TechnologySupervisory Control & Data Acquisition Communication Technology•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 SeriplexWhat is a Network ? A group of devices physically connected together for the purpose of sharing information, resources and a common transmission medium.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 powerWhat makes a network work ? Computers, printers …... Network interface cards Network adapter Software drivers Network Cabling Network protocolsThe 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)Master / Slave Network Central Control and Administration Central Processing of Information Polling of Stations Master Slave Slave SlavePeer To Peer Network Distributed Administration Independent Processing of Information Shared Transmission MediumClient / Server Network Central Network Administrator Controlled Flow of Information Independent Processing of Information Shared Transmission MediumHow 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 MediumOSI 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 MediumOSI 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 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 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 OpticsCDMA/CD – Carrier Sense Multiple Access with Collision Detection 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 Datali ...