27.1 TOPOLOGY 527

27.2 OSI NETWORK MODEL 528

27.3 NETWORKING HARDWARE 529

27.4 NETWORK CONTROLS 531

27.5 NETWORK STANDARDS 531

27.5.1 Devicenet 531

27.5.2 CANbus 534

27.5.3 Controlnet 535

27.5.4 Ethernet 536

27.5.5 Profibus 537

27.5.6 Sercos 537

27.6 PROPRIETARY NETWORKS 537

27.6.1 Data Highway 537

27.7 NETWORK COMPARISONS 540

27.8 DESIGN CASES 541

27.8.1 Devicenet 541

27.9 SUMMARY 542

27.10 PRACTICE PROBLEMS 542

27.11 ASSIGNMENT PROBLEMS 543

27.1 PRACTICE PROBLEM SOLUTIONS 545