Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 383)

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DMS 3.2 EN 02/2011 TD29 381
Example of an Alarm configuration
Open by a mouse-click on the plus sign at the entry 'Alarm configuration' the currently
available configuration tree. If you are going to create a new configuration, this tree
only will show the entries 'Alarm classes' and 'System'.
8.3.2 General information on alarms, Terms
The usage of an alarm system in »PLC Designer« obeys the following universal
descriptions and definitions concerning alarms:
• Alarm: Generally an alarm is regarded as a special condition (expression value).
• Priority: The priority, also named "severity", of an alarm describes how important
(severe) the alarm condition is. The highest priority is "0", the lowest valid priority
value is "255".
• Alarm state: An expression/variable configured for the alarm control can have the
following states: NORM (no alarm), INTO (alarm just has come), ACK (alarm has
come and has been acknowledged by the user), OUTOF (alarm state has been
terminated, alarm "has gone", but not yet acknowledged !)
• Sub-State: An alarm condition can have limits (Lo, Hi) and "extreme" limits (LoLo,
HiHi). Example: The value of an expression ascends and first will transit the HI-
limit, thus causing the coming of an HI-alarm. If the value continues ascending
and exceeds also the HIHI-limit before the alarm gets acknowledged by the user,
then the HI-alarm will get acknowledged automatically and just the HIHI-alarm
remains in the alarm list (which is an internal list used for alarm administration).
The HI-state in this case is named sub-state.