Method and system for secure transmission of process data to be transmitted cyclically via a transmission channel between a master and a slave
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United States of America Patent
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Nov 27, 2012
Grant Date -
May 27, 2010
app pub date -
Mar 22, 2008
filing date -
Apr 5, 2007
priority date (Note) -
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Abstract
The invention relates to a method and system for secure transmission of process data to be transmitted cyclically in a cyclical data transmission to be performed protocol-specifically via a transmission channel between a user functioning as a master and at least one user functioning as a slave that are connected to the transmission channel. Within a transmission protocol frame, a time slot that can always accommodate the same number of bits independently of the data to be transmitted is assigned to each slave during a data transmission cycle. For safety-relevant process data that is to be transmitted during a data transmission cycle from a slave to at least one additional user, or that is to be transmitted during a data transmission cycle from a user to at least one slave, additional first protection data for recognizing error-free transmission of this safety-relevant process data is generated and transmitted in each case.
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