Allows monitoring an analog variable by specifying a maximum difference limit or a dead band value, relative to a reference value or a setpoint.
Dead Band
This type of Alarm is indicated when a reference or setpoint varies, and also when users want to avoid an unnecessary number of Alarms for small oscillations in the monitored variable.
Dead band tab
The available options on this tab are described on the next table.
Available options for the Dead band tab
Option |
Description |
|---|---|
Enable |
Enables a dead band |
Setpoint |
A Link to a reference variable, so that users can monitor a difference relative to a monitored variable |
Value |
Indicates the difference between the monitored variable and the setpoint, from which this Alarm must be indicated. It must be informed in engineering units of the monitored variable |
Message text |
Allows specifying a text displayed to users when this Alarm is in an active condition |
Severity |
Specifies an Alarm level's severity. Available options are Critical, High, Medium, or Low |
Need Ack |
Enables or disables Alarm acknowledgment |
Delay (ms) |
Specifies a delay time, in milliseconds. When this value is equal to 0 (zero, default), no delay is applied |
Return message |
Allows specifying a text displayed to users when this Alarm is not in an active condition |
Allow shelving |
Enables or disables shelving this Alarm |
Maximum shelving time |
Maximum time, in minutes, this Alarm can remain shelved. Default value of this option is 60, that is, one hour |
Maximum shelve count |
Maximum number of times this Alarm can be shelved. Default value of this option is 0 (zero), that is, no limit |