August 2003
Intermediate to advanced
320 pages
10h 14m
English
Content preview from Practical TCP/IP and Ethernet Networking for Industry
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Process automation 239
Ethernet as a control network by allowing system designers to prioritize messages,
guaranteeing the delivery of time critical data with deterministic response times. This
ability has been used by companies such as HOST engineering and think & do software
to produce an Ethernet bus that can provide deterministic scan time in the 2 to 3
millisecond range for one I/O rack with 128 points.
Redundancy
The IEEE 802.12d standard provides the ability to add redundant links to a network
device. This facilitates automatic recovery of network connectivity when there is a link or
repeater failure anywhere in the network path. This standard obviates the need for custom
solutions when redundancy is required as part of the control ...