Method for monitoring a first node in a communications network and monitoring system
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United States of America Patent
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Feb 16, 2021
Grant Date -
Jul 28, 2016
app pub date -
Apr 1, 2016
filing date -
Oct 14, 2014
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Abstract
A method and corresponding system are described for monitoring a first node in a communications network by a second node, where the first node has a single-channel design and is designed to execute a safety-oriented application. The second node has a dual-channel design, and a safety protocol is used for a data transfer between the first and second node. The second node determines at each of two consecutive time points a time value based on an internal timer, and sends each determined time value to the first node. The first node in response to each receipt of the time values determines a further time value based on a further internal timer. The first node compares a difference between the two time values from the second node with a difference between the two further time values from the first node, and goes into an error state depending on the comparison.
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