Chapter 4
Human Machine Interface
4-16
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National Instruments Corporation
How Do You Monitor and Control Tags?
The Tags VI library and Alarms and Events VI library contain VIs for your
HMI application to interact with the BridgeVIEW Real-Time Database.
These are the primary VIs you use to build your HMI. You can use these
VIs to accomplish the following:
•
Read tag values
•
Write tag values
•
Monitor tag and tag group alarm and event states
•
Acknowledge alarms by tag and tag group
There are other VI libraries that contain VIs with which you can add
additional functionality and sophistication to your HMI. These VIs do not
interact directly with the BridgeVIEW RTDB. Instead, you can query as
well as control other features of the BridgeVIEW system. These VI
libraries are as follows:
•
Tag Attributes
•
Historical Data
•
System, which includes Security VIs
You can reach these VIs through the Functions palette, shown below.
Tags
(Read, Write and Trend
Tags and Constants)
System and Security
Alarms and Events
Tag Attributes
Historical Data
