"Represents Visibility group 63"
Where a bit is set (1) the objects assigned to it are visible.
Default is "all objects visible"
"Alarm to be raised or removed. This is a queued variable, so reading it is not sensible."
Alarm number: Remove this alarm.
0x8000 & Alarm number: Engage alarm.
E.g. engage alarm 10: 0x800a ==32778;
remove alarm 10: 0x000a == 10
Engaging an undefined alarm will show a default informational alarm identifying the number
(removed by ACK)
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