Product specifications

Alarm Analysis Configuration
140 3BDS011222-510 B
f. Enter a message in the Message Text field.
Here you type the message which will be display in the Alarm and
Event list.
g. Enter a message in the Inactive Message Text field.
This message is displayed when the alarm is inactive.
h. Enter an expression in the Expression field.
This is the expression that gives if the message will be displayed.
If an Alarm Expression property received with a bad quality then relevant
condition gets activated, the Active Message and Inactive Message fields will be
overridden with the new message that the alarm expression was activated due to
bad data quality.
To avoid the bad qualities generated during the failure of OPC Server, two
subscriptions for each property (parallel redundancy) are added to the OPC
network where ever redundant OPC Servers are present. In this situation bad
quality alarm will not be created unless both subscriptions show bad quality.
To avoid unnecessary alarms, allowable tolerance is given to bad qualities
directly after the startup of Soft Alarm service provider and after the modification
or creation of an Alarm Expression.
Each aspect can have multiple conditions. Each condition uses one or more
properties and it can be inherited to multiple instances. If Parallel Redundancy is
used then all properties will be subscribed twice.
Avoid adding several alarm expression aspects with the same condition name on
the same object. This situation is ambiguous and will result in unpredictable
alarm states. Running a consistency check will detect this situation. For more
information about consistency check, refer to System 800xA Tools
(2PAA101888*).
OPC servers should have the capacity to handle the number of subscriptions a
solution with Alarm Expression might require.