Method and a system for ensuring a bus and a control server
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United States of America Patent
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N/A
Issued Date -
Apr 6, 2006
app pub date -
Apr 17, 2003
filing date -
Apr 22, 2002
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method and a system for ensuring the operation of a field bus. In the method the field bus is controlled with two control servers one of which is at a time set active and one is set passive. The control servers are connected with a backup bus. In the method, a first message is sent at intervals from the active control server via said field bus to the passive control server, and the active control server waits for a response message to the first message from the passive control server. If the active control server does not receive said response message within a predetermined time, first data on the fault situation is set. The passive control server waits for said second message, in which case if the passive control server does not receive said first message within a predetermined time, second data on the fault situation is set. The invention also relates to a system, in which the method is applied, as well as to a control server to be used in the system.
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