CI840 Redundancy problem in 800xA 5.1 System
HI, I am using 800xA (5.1) system with AC800m controller. I am facing problem with last node of the peofibus Slave (CI840).
CI840 Hardware warning status “ Report diagnostic fault”.
Requesting you to help me to sort out this issue.
Changed the CI840 modules, TU847 and profibus connectors...
As per the snapshot1 you attached it looks your configuration is wrong
you have provided the number 3 for both the backup CI854 and Ci840 3rd position as well.
so change the CI854 poistion as 1(7) instead 1(3) since backup ci854 position starts with 1---6 for Upper position and 7-----12 for Lower position if you are using BC810 only.
Then download and clear the latch errors and check.
It seems this is the expected behavior after upgrading to 4.2/2. The “Report diagnostic fault” would be set if the Ci854 receives a diagnostic frame from the slave where the length of the diagnostic data is not as per the expected. It is a known behavior when you upgrade CI840 FW from 4.0 /X to 4.2/2 OnLine in the system.
Even though the S800-CI840A reports the ‘Report Diagnostic Fault’, the IO communication between the master CI854A and the S800-CI840 shall continue without any problems.
The Report Diagnostic Fault has no impact on the actual IO communication as such.
It is possible to clear the message in a running plant by changing a CI840 parameter. The most harmless parameter to change is the power supervision parameter. If this is changed from FALSE to TRUE you will only get 2 diagnostics messages Power error A and Power error B. When you change back to FALSE the messages will disappear. I think this is the best way to get rid of the “Report Diagnostics fault”.