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Distributed with permission of author by ISA 2006
Presented at ISA EXPO 2006
SUMMARY ON BUS STRATEGIES
There are two reasons to maintain proprietary buses: legacy systems that are still providing
satisfactory service, and highly tuned and specific applications. However, in a world where costs, high
availability, and future-proofing are key operational objectives, industrial Ethernet is the clear winner
for new deployments.
Industrial Ethernet provides the best support, redundancy, security, integration, and migration for
industrial sites as they continue to evolve in the post-9/11 era. Specially hardened switches, hubs, and
media converters provide reliable standards-based solutions to many industrial environments. Even
sites with proprietary field buses and control buses can benefit by having Ethernet interfaces that
provide a secure and redundant path to control centers and monitoring sites.
VLANs, SNMPv3 support, encryption, and SSL connections provide a secure environment as
networks grow and adjust to an ever changing world.
BIBLIOGRAPHY
IEEE 802.1d and IEEE 802.1w Standards
Networking as a 2nd Language; Understanding Spanning Tree Protocol -- the Fundamental
Bridging Algorithm, Michael Norton, O‘Reilly Network, 03/30/01
Achieving Fault-Tolerance with PC-Based Control, David W. Cawlfield, ISA Automation &
Control Subsystems Committee
IEEE Standards for Local and Metropolitan Area Networks: Draft Standard for Virtual Bridged
Local Area Networks, P802.1q-rev (D4) 2005
“Field Buses”, http://www.interfacebus.com/Design_Connector_Field_Buses.html
“Redundancy with Standards in Industrial Ethernet LANs”, Frank Madren, RTC Magazine,
October 2003, http://www.rtcmagazine.com/home/article.php?id=100156
“What’s Your Taste in Ethernet?” Wayne Labs, Contributing Editor, Control Design, June 26,
2005, http://www.controldesign.com/articles/2005/269.html
“Get going with Gigabit”, Paula Doyle, Control Design March 23, 2006,
http://www.controldesign.com/articles/2006/043.html
“Security in Industrial Applications”, Frank Madren, Control Design, March 16, 2006,
http://www.controldesign.com/whitepapers/2006/012.html
“Power over Ethernet (PoE) Makes Progress”, Editorial, Control Design, March 16, 2006,
http://www.controldesign.com/industrynews/2006/022.htm