An extension of the PmVar
variable of the PmaData
object for the connection to the PmaAlarmGroup
object for alarm
the overruning the defined limits of the numeric value.
Two upper and two lower limit values exceeding can be alarmed using this data extension. The first (high/low) limit is usually called the "technological limit"
, the second is called "device limit"
. Each limit watching can be set separately, but there is in fact no sense to enable the second limit without enabling the first.
Properties and methods:
|ActLim||Returns the flag indicating which limit is currently active|
|Alarm||Returns the PmAlarmItem object|
|ExtId||Data extension identifier|
|Max1||Value of the high limit 1|
|Max2||Value of the high limit 2|
|MaxH||Hysteresis value of the upper limits 1 and 2|
|Min1||Value of the low limit 1st|
|Min2||Value of the low limit 2nd|
|MinH||Hysteresis value of the lower limits 1 and 2|
|RefreshState||Alarm state evaluation|
|Var||Returns the PmVar object|
Format of saving the data extension in the form of string
The content of complete of data extension (all configurators) can be saved in the form of single string. See Format of saving the data extension in the form of string