National Instruments BridgeVIEW - Manual (Page 61)

Chapter 3 Tag Configuration
© National Instruments Corporation 3-3 BridgeVIEW User Manual
Alarm Attributes
Alarm attributes describe abnormal process conditions for a given tag.
Alarms are useful for notifying users of abnormal conditions. For example,
if an analog tag measures the volume of a tank, a HI alarm can be used to
indicate that the tank is full and an operator must perform some action
and acknowledge this state before processing can proceed. For information
on how to configure alarming attributes of a tag, see the
Alarms section
later in this chapter.
Static vs. Dynamic Attributes
Tag attributes are classified as either static or dynamic attributes. Static
attributes require you to restart the Engine when you change them from
the Tag Configuration Editor. A static attribute change is marked with
a solid diamond in the Tag Configuration Editor. Examples of static
attributes are general attributes and I/O connection attributes, such as
server, device, or item.
Dynamic attributes do not require the Engine to restart. The Tag
Configuration Editor can change a dynamic tag attribute in a running
Engine. A dynamic attribute change is marked with a hollow diamond in
the Tag Configuration Editor. Examples of dynamic attributes include
enabling logging operations, alarm attributes, and some scaling attributes.
For more information about dynamic tag attributes, see the
Tag Attributes
VIs section of Chapter 7, Advanced Application Topics .
What Is the Tag Configuration Editor?
The Tag Configuration Editor is a tool that assists you in configuring all
the parameters of the BridgeVIEW Engine. The chief component of this
tool is the configuration of all tags in the system. Other configuration
components include Alarm and Event Logging, and Historical Logging.
To start the Tag Configuration Editor, select Project»Tag»
Configuration… from the menu bar of an open VI. Figure 3-1 shows
the Tag Configuration Editor with
tanks.scf loaded.