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Can I retrieve information concerning pressing of the "ACKALL" button on an XBTF in the PLC?

No, it is not possible to retrieve this information directly in bit form in the PLC.

It is however possible to monitor the "No. of last group of alarms acknowledged" word in the dialogue table.
When the operator presses the "ACKALL" button, this word changes from -1 to 0.
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