National Instruments BridgeVIEW 用户手册

Chapter 3

Tag Configuration

© National Instruments Corporation

3-25

How Do You Configure a Tag 

to Log Its Data or Events?

While editing a tag, click on the Log Data or Log/Print Events checkbox. 
If you want to log historical data or events, the BridgeVIEW Engine must 
have these processes enabled. To turn them on, open the Engine Manager 
and turn on the processes with the panel buttons, or configure the Engine 
to turn on these processes automatically at startup by selecting Configure» 
Historical… or Configure»Events… from the Tag Configuration Editor. 
You also can enable these parameters programmatically with System VIs 
that enable event or historical data logging.

How Do You Set Initial Tag Value at Startup?

While editing a tag, select the Set Initial Value checkbox. Then enter the 
initial value in the adjacent Initial Value field.

Scaling

These attributes include what type of scaling to perform on a tag when 
communicating with the device server and the expected engineering range 
and units for the tag.

Table 3-5, provides descriptions of the scaling configuration attributes, 
and indicates the data types to which each attribute applies. For tag 
attribute information about the other configuration categories, see 
Tables 3-1, 3-2, 3-4, and 3-7.

 

Table 3-5.  Scaling Configuration Attributes

Raw Full 
Scale

analog

Determines the full scale (maximum) value used by the server 
for a tag. 

Raw Zero 
Scale

analog

Determines the zero scale (minimum) value used by the server 
for a tag.

Eng Full 
Scale

analog

Determines the full scale (maximum) value used by the 
BridgeVIEW Engine and the user application for a tag. 
Engineering Full Scale must be greater than Engineering 
Zero Scale.