National Instruments BridgeVIEW How Do You Configure a Tag to Log Its Data or Events?, How Do You Set Initial Tag Value at Startup?, Scaling

Chapter 3 Tag Configuration

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.

Table3-5, 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

Tables3-1, 3-2, 3-4, and 3-7.

Table 3-5. Scaling Configuration Attributes

Attribute Applies to

Data Types Description

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.