REDUNDANCY DEVICE UNIT AND METHOD FOR DETERMINING FAULT IN INDUSTRIAL CONTROL SYSTEM INDUSTRIAL CONTROL SYSTEM AND INDUSTRIAL SYSTEM COMPRISING REDUNDANCY DEVICE UNIT

摘要

The present disclosure provides a redundant device unit method industrial control system and industrial system for determining a fault therein. The redundant device unit comprises: a first device configured to be connected with a field device via a first link and a second link in series the first device being configured to be initially active in use and send first diagnostic information indicating when the first device is active whether there is a fault in the first link and/or the second link; and a second device configured to be connected with the field device via the second link and a third link in series the second device being configured to be initially passive in use and receive the first diagnostic information from the first device; wherein when the first diagnostic information indicates that there is a fault in the first link and/or the second link the first device is switched into passive and the second device is switched into active and generates second diagnostic information indicating when the second device is active whether there is a fault in the second link and/or the third link and a determination regarding the fault of the industrial control system is made based on the first and second diagnostic information.