National Instruments BridgeVIEW 用户手册

Chapter 4

Human Machine Interface

4-2

© National Instruments Corporation

There are several general G programming principles with which you should 
be familiar before you build an HMI. These principles are listed below:

•

Building basic G front panels and diagrams

•

Using controls and indicators

•

Using the tag data type

•

Using the basic principles of dataflow programming

•

Using basic programming constructs such as the Sequence structure 
and While Loop

•

Using the Time and Dialog VI library

To learn about any of the topics above, see the 

G Tutorial

 section of this 

manual and complete the activities. For more detailed information, see the 
G Programming Reference Manual.

For more advanced HMI programming, you also should know how to use 
the G control and indicator attribute nodes and the VI Server functions. 
For more information about this topic, see Chapter 13, 

, and Chapter 15, 

Application Control

.

You might want to divide your HMI into several panels so the operator can 
navigate through them using buttons on the screen. The Panel G Wizard 
helps you generate the navigation system by automatically generating code 
and attaching it to front panel buttons. For more information about the 
Panel G Wizard, see Chapter 7, 

.

How Do You Build an HMI?

To build an HMI, use the graphical controls and indicators to lay out the 
user interface objects on the front panel, and a special set of VI libraries 
on the block diagram to do the following:

•

Read and write tag values

•

View and acknowledge alarm states and events

•

Display historical and real-time data 

•

Read tag configuration and security information

•

Control the BridgeVIEW system programmatically

•

Access and change tag attributes

•

Control output tags