Safety network for industrial controller providing redundant connections on single media
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United States of America Patent
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Oct 7, 2003
Grant Date -
N/A
app pub date -
Sep 21, 2000
filing date -
Dec 22, 1999
priority date (Note) -
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Abstract
A highly reliable industrial control system is produced by opening multiple connections on a connected messaging network running a standard serial protocol. The two connections are used to transmit redundant data and include a reply message to the message producer. Errors in the messages or media failure may be detected using standard error detection codes, retry counters and deadman timers. Comparison of the data of the two messages can reveal other types of failure not apparent by these former techniques.
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