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REDUNDANCY DEVICE UNIT AND METHOD FOR DETERMINING FAULT IN INDUSTRIAL CONTROL SYSTEM, INDUSTRIAL CONTROL SYSTEM AND INDUSTRIAL SYSTEM COMPRISING REDUNDANCY DEVICE UNIT
REDUNDANCY DEVICE UNIT AND METHOD FOR DETERMINING FAULT IN INDUSTRIAL CONTROL SYSTEM, INDUSTRIAL CONTROL SYSTEM AND INDUSTRIAL SYSTEM COMPRISING REDUNDANCY DEVICE UNIT
A redundant device unit includes a first device connected with a field device via a first link and a second link in series. The first device, initially active in use, when active sends diagnostic information indicating whether there is a fault in the first link and/or the second link. A second device connected with the field device via the second link and a third link in series, initially passive in use, receives the first diagnostic information from the first device. When the first diagnostic information indicates that there is a fault in the first link and/or the second link, the first device switches to passive and the second device switches to active and generates second diagnostic information indicating whether there is a fault in the second link and/or the third link. A determination regarding the fault is made based on the first and second diagnostic information.
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