800xA Frozen Alarms

Hello,

1. We have ABB 800xA v5.1 and I have found that some of the alarms (analogue) are "Freeze" even if the alarm conditions are not present. Other alarms are just working fine.

2. Is there any way to put dead-band / hysteresis in alarms generated thru expressions.

Thanks & Regards,
Riz.

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Engr. Rizwan Hassan Rank: 502

Asked 9 months ago

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Voted best answer

1. Right click the alarm(s) -> Event Details... -> Take note of Category
Depending on the category (=origin) your options vary. Let me know the category and I’ll guide you further.

2. No

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by Engr. Rizwan Hassan Rank: 502 on 1/9/2019 8:53:52 PM | Like (0) | Report

Thanks Stefan for your reply. I just got some more input from concerned people. The alarm is annunciated for operators with colored rectangle with alarm word LL, L, H or HH inside. What actually happening is that the alarm color appears / disappears with alarm but the alarm word is not doing so, it is just there - all the time for only L alarm. I have same aspect working perfect with other AI.

Regards,
Riz

by Stefan Stromqvist AKS expert

Rank: 1 on 1/9/2019 9:19:30 PM | Like (0) | Report

Please identify the alarm’s Category (right click, then Event Details) and let us know. Insert images.

It may become necessary to dig further in the alarm’s origin. But first we need to identify the source.

by Engr. Rizwan Hassan Rank: 502 on 1/10/2019 8:46:33 PM | Like (0) | Report

Hello Mr. Stefan, I am unable to insert image in comment section. Here are the alarm details. Category is Process Event Condition. Event Type is Condition Event. Quality is Good, Non-Specific. Actor is ITService. Priority 5 and Class 1.

Best Regards,
Riz.

by Stefan Stromqvist AKS expert

Rank: 1 on 1/10/2019 10:38:25 PM | Like (0) | Report

If needed, additional images can be posted in answers to your own question

I assume "Process Condition Event", which origin from AC 800M application.

Please use Control Builder M -> Online -> navigate to object with alarm -> right click -> Alarm Conditions...

What state is the alarm in when you have the issue (online help will assist with translating the CondState for you)

CondState should map what you see in 800xA HMI

A third party OPC AE Client, e.g. MrCrilfe (who regional ABB support should be able to assist you with gaining access to) can be connected directly to the AC 800M OPC server (subscribe+refresh) to display standing alarms and their states.

Be sure to have "Support refresh" enabled in the Alarm Collection Definition of AC 800M in Library Structure

Please check this and revert.

Do not hesitate to log a support case with your regional ABB support in case you need more help.

by Engr. Rizwan Hassan Rank: 502 on 1/17/2019 9:00:53 PM | Like (0) | Report

The alarm condition show me H=2 and L=4 (L is the problematic alarm, color animation working fine but text frozen), after a controller download which reset Modbus comm the alarm is cleared.

Best Regards,
Riz

by Stefan Stromqvist AKS expert

Rank: 1 on 1/17/2019 10:56:43 PM | Like (0) | Report

CondState 2 = idle
CondState 4 = active (acknowledged IIRC)

Hence, your problem is in the AC 800M / MODBUS, not HMI/alarm list.

Seek help from support advising you have a stuck modbus alarm.

by Stefan Stromqvist AKS expert

Rank: 1 on 1/17/2019 10:59:09 PM | Like (0) | Report

rather ”modbus related alarm”.

The Process Condition Event category are ”man made” ie not auto generated from hardware.

by Engr. Rizwan Hassan Rank: 502 on 1/18/2019 3:48:41 AM | Like (0) | Report

The alarm conditions are H=2 and L=4 (L was the alarm whose text was frozen but animation was working fine), the issue is resolved after a download of controller due to some other activities which reset the Modbus comm and the alarms.

Best Regards,
Riz.

by Engr. Rizwan Hassan Rank: 502 on 1/18/2019 4:08:11 AM | Like (0) | Report

Pardon for repeat comment, thanks for your support. If you can also have a look at another question I posted... Regards.
https://forum-controlsystems.abb.com/20203678/SM811-Fault-and-Shutdown

by Stefan Stromqvist AKS expert

Rank: 1 on 1/18/2019 4:26:15 AM | Like (0) | Report

My knowledge in AC 800M HI & Safety applications is more or less limited to their names. Sorry, I would probably just waste your time by entering an answer to that question.

I stick to topics I have knowledge in.

by Engr. Rizwan Hassan Rank: 502 on 1/18/2019 4:37:10 AM | Like (0) | Report

Cheers and kind regards.

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Stefan Stromqvist AKS expert

Rank: 1

Answered 9 months ago

Answers

For Alarm Expressions, to my understanding there is no Dead Band band Functionality. But there are Active and Inactive Filter Time functions part of Alarm expressions from 5.1.1.4SP2 which can be used.

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Sethu Murugan Rank: 457

Answered 9 months ago

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800xA Frozen Alarms

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