|
|
ED
|
avaliable
|
|
RT
|
not used
|
A threshold value can be defined, that is used for the releasing
of the limit violation. So undesired reactions on quick series of
alarms for analog values can be avoided.
Example 1: Maximum value = 900, threshold = 10 makes 890
Limit is violated above 900 and violation is released under
890.
Example 2: Minimum value = 900, threshold = 10 makes 910
Limit is violated below 900 and violation is released over 910.
In differnce to the hysteresis this property does not influence the
display of the value but only the alarm behaviour.