National Instruments BridgeVIEW 用户手册

Chapter 7

Advanced Application Topics

7-10

© National Instruments Corporation

When you change programmatic attributes with the Tag Configuration 
Editor, you can update Engine processes without shutting down and 
restarting the Engine, provided no changes require the Engine to 
reconfigure. You can change all operations, alarms, and most scaling, and 
raw or engineering range information dynamically.

There are certain attributes you cannot change dynamically. These 
attributes require you to edit the 

.scf

 file with the Tag Configuration 

Editor, and they include tag information like tag name, tag description, 
scaling type, engineering unit, data type (analog, discrete, bit array, string), 
tag group name, and access rights (input only, output only, Input/Output, 
memory); and tag connection information like server, IO Group, and item.

For more information about tag attributes, refer to any one of the five 
configuration attributes tables in the section 

 

in Chapter 3, 

. 

Activity 7-2. Use Tag Attributes

You will use 

mytanks.scf

 in the 

BridgeVIEW\Activity

 directory, as 

edited in Activity 3-1, 

.

1.

Open 

Monitor Product.vi

 from the 

BridgeVIEW\Activity

 

directory. You created this VI in Activity 4-3, 

. If you did 

not complete this activity, you can open the VI from the 

BridgeVIEW\Activity\Solutions

 directory.

2.

Open the block diagram, select the While loop, and delete it. Because 
you released the Wizard Lock in Activity 4-3, the HMI G Wizard will 
no longer replace the old code, but will generate additional code 
instead.

3.

Pop up on the tank on the front panel and select HMI G Wizard. 
Change the Normal color to Blue, and select the alarms to show for the 
HI alarm state only, as shown in the following illustration.