Lenze PLC Designer PLC Designer (R2-x) - Manual (Page 391)

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DMS 3.2 EN 02/2011 TD29 389
Type: The alarm types listed in the following can be used. For each type regard the
appropriate comment resp. the definitions to be done in the area beyond the table !
DIG=0 Digital alarm, active as soon as the expression gets FALSE.
DIG=1 Digital alarm, active as soon as the expression gets TRUE.
LOLO Analog alarm, active as soon as the value of the expression falls below the
Value defined for Alarm type LOLO. You can define a tolerance (Deadband). As long
as the expression value is within the dead band, no alarm will be activated, even if
the LOLO-value has been falling below the limit.
LO corresponding to LOLO
HI Analog alarm, active as soon as the expression exceeds the Value defined for
Alarm type HIHI. You can define a tolerance (Deadband). As long as the expression
value is within the dead band, no alarm will be activated, even if the HI value has
exceeded the limit.
HIHI corresponding to HI
DEV- Deviation from the target value; Alarm gets active as soon as the value of
the expression falls below the value defined for Alarm type DEV- plus the
percentage deviation. Percentage deviation = target value * (deviation in %) / 100.
DEV+ Deviation from the target value); Alarm gets active as soon as the value of
the expression exceeds the value defined for Alarm type DEV+ plus the percentage
deviation. Percentage deviation = target value * (deviation in %) / 100.
ROC Rate of Change per time unit; Alarm gets active as soon as the expression
deviates strongly from the previous value. The limit value for activating an alarm is
defined by the number of value changes (Rate of changes) per second, minute or
hour (units per).
Class: Choose the desired alarm class. The selection list will offer all classes which
have been defined in the alarm class configuration before the last saving of the
project.
Priority: Here you can define a priority level 0-152. 0 is the highest priority. The
priority will impinge on the sorting of the alarms within the alarm table.
Message: Define here the text for the message box, which will appear in case of an
alarm. This box must be confirmed by the user with OK, but this OK will not
automatically acknowledge the alarm ! For confirming (acknowledge) the alarm the
alarm table must be accessed. This is possible via the visualization element alarm
table or via the date of the alarm entry in the table. This date can be read from a log
file which can be created optionally.
Regard that, when visualizing the alarms in an alarm table element in a visualization,
the message text defined here might be overwritten by a corresponding text entry
from an language file in xml-format, which is specified in the visualization for the
purpose of dynamic language switching.