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UniInt failover: Interface in the "Primary" state, "Backup" interface not available

Question asked by Navaneethakrishnan Champion on Jan 16, 2017
Latest reply on Jan 16, 2017 by gmichaud-verreault

Hi All,


I am getting sudden drop in the archived value for a OPC tag for only one datetime like below,


Timestamp                         Value

25-12-2016 00:00:30           514.2

25-12-2016 00:10:30           514.6

25-12-2016 00:20:30           15.3

25-12-2016 00:30:30           515.3

25-12-2016 00:40:30           514.3


I have checked the interface message log and found "UniInt failover: Interface in the "Primary" state, "Backup" interface not available" this message in both primary and secondary interface nodes. While checking from the DCS/OPC end, the values are normal (like 25-12-2016 00:20:30 - 513.8).


1. What could be the reason behind the drop value in PI side?

2. What is the resolution to be taken care to avoid it in the future?


Could anyone help me out here.


Have a nice day!



Navaneethakrishnan V.