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Adding logic and control Chapter 24
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Stopping derived tags in network and local station
applications
Having multiple clients stop derived tags processing is not recommended. Do
this in special cases only, for example, for application maintenance.
To stop a single derived tag component, use one of these methods:
In the Macros editor, create a macro that contains the command,
DerivedOff <component>. In the HMI Server Properties dialog box,
click the Components tab, select the check box, On shutdown macro,
and then specify the macro.
Derived tags processing will stop when the HMI server shuts down.
In the Events editor, specify the DerivedOff <component> command
as the action for an event.
At the command line in FactoryTalk View Studio, or the FactoryTalk
View SE Administration Console, type DerivedOff <component> and
then press Enter.
Stopping derived tags in local station applications only
The following methods, which use clients to stop derived tags processing, are
recommended for local station applications only:
In the Graphics editor, create a button and then specify the
DerivedOff <component>
command as the button’s press action.
When the button is pressed, derived tags processing stops.
In the Graphics editor, create a graphic object and then attach touch
animation with the DerivedOff <component>
command as the object’s
action. When the object is touched, derived tags processing stops.
For the Logout Macro in the FactoryTalk View SE User Accounts
editor, specify the DerivedOff <component> command, or a macro
that contains the command.
For the Shutdown command in the Display Settings Behavior tab,
specify the DerivedOff <component> command, or a macro that
contains the command.
Events are expressions that trigger actions:
Expressions are equations containing tag values, mathematical
operations, if
–
then
–
else logic, and other built-in FactoryTalk View
functions. For information about using expressions, see Creating
expressions on page 553.
Actions are FactoryTalk View commands, symbols, or macros. For
example, an action could initiate a snapshot of tag values using the
Setting up
FactoryTalk View
SE events