Rockwell-automation FactoryTalk View Machine Edition Users Guide Manual do Utilizador descarregar pdf (Página 372)

100

101

FACTORYTALK VIEW MACHINE EDITION USER’S GUIDE

20-38

• • • • •

FactoryTalk View monitors the expression value rather than the original tag value. For

example, your machine might send values to the data source in the form of temperature in

degrees Celsius. You could use an expression to convert the value to degrees Fahrenheit,

and then monitor the expression result rather than the original tag value.

If you can assign an expression, a Browse button is present in the Exprn column in the

Connections tab.

To specify an expression, do one of the following

 In the “Tag / Expression” column, type the expression.

 In the Exprn column click the Browse button and then create an expression in the

Expression editor. Use this method if you want to check the expression syntax, or to

use multiple lines for the expression.

For more information about expressions, see Chapter 23.

Replace tags using tag substitution

You can replace tags assigned to the graphic objects in your display by using tag

substitution. You can also replace the tags used in expressions assigned to graphic objects.

For example, if you assign a tag called HoistHeight to multiple objects in the display, and

then decide to use the tag Hoist_height instead, you can use tag substitution to quickly

replace the old tag with the new tag.

You can replace:

 A tag name (with or without folder names).

 A folder name.

 The text in an expression.

 Tags contained in embedded variables.

To replace tags

1. Select one or more objects.

Type the expression here... ...or click the button to open the Expression editor..

1 2 ... 367 368 369 370 371 372 373 374 375 376 377 ... 676 677

Comentários a estes Manuais

Sem comentários

Rockwell-automation FactoryTalk View Machine Edition Users Guide Manual do Utilizador Página 372

Comentários a estes Manuais

Manuais e produtos relacionados com Equipamento Rockwell-automation FactoryTalk View Machine Edition Users Guide