CI854 Healthy but Connection Down Alarms keep coming

Hi All,

We are having an issue with CI854 (800xA 5.1 FP4). We have 2 controller & total of 5 CI854.
We had heap related issue with 1 of the controller (with 4 CI854 cards). we tried doing a cold restart but it was not happening so we resolved the issue by doing power reboot of this controller (removed the power connections & then downloaded the program by cold restart).while doing the cold restart we removed all the profibus connection of both the controllers (for safety). After cold restart, we again made the profibus connections & both the controller communication with CI854's got established.

Since that day, we are having an issue that for all the CI854 cards related to controller (which we did cold restart), we are getting alarms showing Connection Down.

Attached are the screenshots for reference.
Please let us know how to resolve this error related to alarm

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Yoginder.K.Singh Rank: 25

Asked 3 months ago

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If this issue comes intermittent, there's a Field Alert out for it already. If I remember correctly you can set Watchdog Time on CI854 higher than the slowest Task Time in Control Application as workaround

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by Yoginder.K.Singh Rank: 25 on 12/31/2019 1:23:14 AM | Like (0) | Report

Hi. Thanks for the workaround solution. But can you please give a little more detail on Watch Dog time. As per the suggestion, I have to increase it from 240msec to 1800msec. My worry is whjat impact it can have on my system (like delay in receiving feedbacks etc). because, I am running load shedding application in this syem which henerally has to work within 50msec.

Does increasing watch dog time has any impact on the process application

by backdraft AKS expert

Rank: 22 on 12/31/2019 2:59:23 AM | Like (0) | Report

Yes the Watchdog Timeout certainly impacts your process application.
But please first check this Field Alert applies here, i was talking about:
AC 800M Controller Firmware, Version 5.1.1-3, PROFIBUS on CI854 Intermittently Interrupted Causing Watchdog Timeout on PROFIBUS Slaves
https://search.abb.com/library/Download.aspx?DocumentID=3BSE047421D0210&LanguageCode=en&DocumentPartId=&Action=Launch
If then you need further help I propose you should contact abb supportline.

by Yoginder.K.Singh Rank: 25 on 12/31/2019 3:17:44 AM | Like (0) | Report

The workaround suggested by you is working but issue is now the actual alarms which should come (DI card fail) are also stop updating .:D

by backdraft AKS expert

Rank: 22 on 12/31/2019 7:00:09 AM | Like (0) | Report

I think there's another Field Alert out for issues with too much diagnostic data, may be applies here, but as written if you do not have the experience better to contact professional support.

by b.schliessmann Rank: 196 on 1/2/2020 7:25:32 AM | Like (0) | Report

The PROFIBUS watchdog time only has an impact in case of errors: Every slave has a watchdog timer which is reset after receiving a valid master telegram. It expires after the set watchdog time. In your case, if a slave doesn't receive a master telegram after 240 ms from the last, it goes into error state. The typical net reaction time mainly depends on the PROFIBUS cycle time instead.

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backdraft

Rank: 22

Answered 3 months ago

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CI854 Healthy but Connection Down Alarms keep coming

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