semaphore TBOX LT2-530 Series, User Manual, Page: 112 / 197

Version : 1.09 112
12.3. Analog Alarm Condition
Tagname: The Tag selected to generate the alarm.
Type:
Maximum or Minimum.
The threshold for which the alarm will be started. If the value of the analog Tag passes
under (minimum) or over (maximum) this threshold, the alarm is started. If an alarm
must be generated for both a maximum and a minimum threshold, 2 conditions must be
declared with the same Tag.
Value:
The threshold value, according to the format and scaling of the Tag (see chapter 9. The
Tags).
Hysteresis:
The amount that the level must fall or rise below or above the Max. or Min. value before
an alarm can be re-started
Relation between Value and Hysteresis
With “MAXIMUM” threshold Value > threshold = Alarm TRUE
Value < (threshold – hysteresis) = Alarm FALSE
With “MINIMUM” threshold Value < threshold = Alarm TRUE
Value < (thr hysteresis) = Alarm FALSE
Recipient:
Select a Recipient or a group of recipients. The ‘person’ you wish to contact in case of
alarm (see ‘Recipients’ below).
In case you select a ‘group of Recipients’ see next.