A Survey of Available Field Buses Monitor and Control Engineer MMA Project Mick Brooks.

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Presentation transcript:

A Survey of Available Field Buses Monitor and Control Engineer MMA Project Mick Brooks

Introduction n What is a field bus? n Some examples and comparison n A field bus simulation

What is a Field bus? n Smart devices n Determinism n Small amounts of data n Fault Tolerance n Noisy environments n Low cost

Advantages over traditional process control n Simplification of wiring n Reduced cost of wiring n Faster installation and debugging n Improved maintenance and fault tolerance n Higher reliability

ISO Protocol Layers n Layer 1: Physical medium n Layer 2: Data link n Layer 3: Network n Layer 4: Transport n Layer 5: Session n Layer 6: Presentation n Layer 7: Application

A Long List n Controller Area Network (CAN) * n Local Operating Network (LON) * n Profibus * n Seriplex * n AS-I n Interbus n ControlNet n ARCNet * n Foundation Fieldbus

Physical Media n Balanced twisted pair: CAN, Profibus, LON n Fiber optic: Profibus, LON n Coaxial: ARCNet, LON

Data Rates n CAN: 1 Mbps at 40m n LON: 1.25 Mbps at 500m n Profibus: 12 Mbps at 100m n Seriplex: 100 kbps at 100m n ARCNet: 2.5 Mbps at 100m

Topologies n Bus (multi-drop): Profibus, CAN, LON, Seriplex, ARCNet n Star: LON, Seriplex, ARCNet n Ring (distributed star): ARCnet

Media Access Characteristics n Token based: Profibus, ARCNet n CSMA: CAN, LON n Circuit based: Seriplex

Determinism n CAN: bit wise collision arbitration, RMA n LON: collision detection, priorityslots n Profibus: Token n Seriplex: dedicated bandwidth n ARCNET: Token

Host support n CAN: ISA, VME, PC/104 n LON: ISA, VME, PC/104 n Profibus: VME, cPCI, ISA, PC/104 n Seriplex: ISA, VME, PC/104 n ARCNET: ISA, VME

OS Support n CAN: VxWorks, OS/9, DOS, pSOS, NT, Linux, Solaris, QNX n LON: VxWorks, OS/9, DOS, NT, Solaris, QNX, LNS n Profibus: DOS, NT, OS/2, QNX, SCO n Seriplex: NT n ARCNET: VxWorks, NT, QNX

Devices available n CAN: Philips, Intel + more n LON: Echelon, Toshiba n Profibus: Bosch, Siemens + more n Seriplex: Square D, Turck + more n ARCNET: SMCS

A CAN Simulation n Simulation of CAN using queuing theory n From I+ME commercial CAN simulator n Three node network

Simulated CAN System

CAN Throughput

Message Latency Statistics

Lost Messages

Summary n Large numbers of industrial sites n Cheap interfacing n Built-in fault tolerance n Development support tools n Predictable response times