Please also see the attached screenshots in this topic and my own first answer.

We have a machine where the PLC parts of an alarm have been deleted. However the alarm has not been deleted from the WinCC part of the SW.

Unfortunately this means that the machine has 2 constant lines (a message and a warning) in the alarm list with the no longer relevant alarm (see pic 3).

From the deleted PLC logic I have decided that it was DB1200.DBX8.5 (coming from either M101.4 or M500.0) that was generating the alarm but I checked with a watchlist that neither of these signals was true (see pic 1).

On displayF1_1_Drift.pdl I can see that the tag in WinCC is -FA1_V2_G1_MA1.STATUS (see 4.jpg) so I searched in the Tag Manager for FA1_V2_G1_MA1 (see pic 4,5,6,7 & 8). I also searched in the Alarm Logging for the tag (see pic 9, 10, 11 & 12)

I also tried searching for "MO#" and "Udsugning" in most of the groups but with no success.

How can I get rid of the 2 lines in the Alarm List that are relating to the alarm that has been deleted in the PLC logic?

Hello Murof,

Thank you for answering.

Unfortunately I do not understand the answer - I need a "for Dummies" answer:

"do you have checked the whole message tag (all 16 bits) not only the ones from the obsolete alarms?"

What do you mean - WHAT is the whole message tag?

HOW do I check this message tag once I know what it is?

"perhaps there is some kind of byte swap"

What is a "byte swap" and hos / where do I see if there is one?

"you have to check also the other byte of the tag"

Is that the same as checking all 16 bits and you mentioned earlier - or is this something else? 

Murof

Hello xmnj

do you have checked the whole message tag (all 16 bits) not only the ones from the obsolete alarms?

perhaps there is some kind of byte swap and you have to check also the other byte of the tag

Bye Murof