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In the first two commands, the tag placeholders Tag1, Tag2, and Tag3 are

string tags. When the macro runs, the tags have the values 1, 2, and

‘

Screen,’ respectively.

Substituting the current values for the tag placeholders in commands in the

macro, FactoryTalk View opens displays named Screen1 and Screen2, and

then sets a tag named Valve23 to its open state.

Tip: If a tag placeholder is enclosed in double quotes (" ") or

nested in the string value of another tag placeholder in

the command, then FactoryTalk View will not substitute

the tag value.

Example 2: Ensuring that the tag value is evaluated as expected

FactoryTalk View evaluates tag placeholders before commands are run. For

example, if the press action for a button object is:

Tag1 = 4

Display Screen$Tag1$

when the button is pressed, the value of Tag1 will be substituted for the tag

placeholder in the Display command before Tag1 is set to 4.

To ensure that the tag is set first, embed the command containing the tag

placeholder in a macro that uses the tag as a parameter. Given a macro

named Display_Detail

, this would change the button’s press action to:

Tag1 = 4

Display_Detail Tag1

Inside the macro, the tag placeholder is specified with the Display command,

as follows:

Display Screen$%1$

Now when the button is pressed, FactoryTalk View will first set the tag to 4,

and then run the Display command in the macro, opening a display named

Screen4.

Where commands run

Some commands run at the FactoryTalk View SE Server, some run at the

FactoryTalk View SE Client, and some run wherever they were issued.

Commands that run at the FactoryTalk View SE Server

Acknowledge

AlarmPrintOn

DerivedOn

AcknowledgeAll

DataLogChangeRate

EventOff

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AlarmAcceptEdits

DataLogMergeToPrimary

EventOn

AlarmEvent

DataLogNewFile

HandShakeOff

AlarmLogNewFile

DataLogOff

HandShakeOn

AlarmLogOff

DataLogOn

Silence

AlarmLogOn

DataLogRenameFile

SilenceAll

AlarmLogSendToODBC

DataLogSnapShot

SuppressOff

AlarmOff

DataLogSwitchBack

SuppressOffAll

AlarmOn

DerivedOff

SuppressOn

AlarmPrintOff

Commands that run at the FactoryTalk View SE Client

Abort

Key

PrevWindow

Define

Identify

PrintDisplay

Display

Invoke

PullForward

DisplayClientClose

Language

PushBack

DisplayClientOpen

RecipeRestore

DisplayNavigationHistory

Logout

RecipeSave

DisplayNextScreen

NextPosition

ScreenPrint

DisplayPreviousScreen

NextWindow

SendKeys

Download

OpenRSLogix5000

SetFocus

DownloadAll

Password

Undefine

FlushCache

Position

Upload

Help

PrevPosition

UploadAll

Commands that do not run in test display mode

Most commands that run at the FactoryTalk View SE Client will also run in

FactoryTalk View Studio, in test display mode. The following exceptions are

ignored in test display mode:

Abort

Key

PrintDisplay

Display

PullForward

DisplayClientClose

Logout

PushBack

DisplayClientOpen

NextWindow

SetFocus

FlushCache

PrevWindow

Commands that run wherever they are issued

These commands run wherever they are issued. For example, if one of these

commands is issued at the FactoryTalk View SE Client, it runs at the client.

= (Equal)

Beep

Ramp

AlarmLogRemark

DDEExecute

Remark

AppAbort

Set

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AppActivate

Pause

Toggle

AppStart

PlayWave

If you are using Windows 7 Professional or Windows Server 2008, the

AppStart command should not be used with interactive actions that use

Events.

You can specify several command parameters using either absolute or

relative references. Relative references work like file names. Absolute

references work like file paths.

A relative reference is a reference to an application component, excluding its

path. The component’s path is determined from the context in which the

component’s name is specified.

An absolute reference is a reference to an application component, including

its path.

For example:



/MixingArea::IngredientDisplay is an absolute reference to a graphic

display called IngredientDisplay in the area called MixingArea.



IngredientDisplay is a relative reference to a graphic display called

IngredientDisplay in the current area.

In local applications you only need to use relative references.

How relative references are resolved

You only need to understand how relative references are resolved when you

are creating network distributed applications. If you are creating network

station or local station applications, you can skip this section.

Before FactoryTalk View can perform an action on a component that is

specified using a relative reference, the relative reference must be resolved.

To do this FactoryTalk View converts the relative reference to an absolute

reference.

For example, if the current area is called RecipesArea, the graphic display

specified using the relative reference IngredientDisplay is resolved to the

absolute reference /RecipesArea::IngredientDisplay before it can be used.

For commands, relative references are resolved in different ways, depending

on the type of parameters the command takes.

Commands that take tags as parameters

Commands that take tags as parameters are resolved as follows:

Using absolute and

relative references

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

When the command runs from a graphic display, the area that contains

the graphic display is used to resolve the relative reference.

For example, if the command Display OverviewStats runs from the

graphic display called IngredientDisplay in the area RecipesArea, the

area name RecipesArea is used to resolve the relative reference in the

command.

If the command runs from the graphic display called IngredientDisplay

in the Mixing area, the Mixing area name is used to resolve the relative

reference in the command.



When the command is run by an Events component, the Alarm

Identification feature, or the Startup or Shutdown macros, the area that

contains the HMI server is used to resolve the relative reference.

Commands that take HMI project components as

parameters

When the command runs from a graphic display, the area that contains the

graphic display is used to resolve the relative reference.

Some commands are run by a part of the system that runs in the background.

This background activity is managed by the HMI server.

For example, an Events component runs commands when events occur.

These parts of the system resolve relative references using the area in which

the HMI server is located, because the HMI server manages the background

activity.

If you have long commands, or commands with parameters that are hard to

remember or easy to mix up, you can rename those commands with a single

word called a symbol.

Symbols can be used anywhere a command can be used: in a box that

requires an action, in a macro, or at the command line.

You can define symbols in a macro or at the command line. However,

symbols are mainly an operational convenience when using the system from

the command line.

To define a symbol:

At the command line or in a macro or box, type:

Define <symbol > <string>



<symbol > is the abbreviated command, without spaces.



<string> is an existing command with or without parameters. It can

contain spaces and other symbols.

Creating symbols

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Example: The Define command

In this example, the command Display Overview is replaced with the

word Show.

To clear a symbol:

At the command line or in a macro or box, type one of the following:

This command

Does this

Undefine <symbol >

<symbol > is the name of the symbol you want to delete.

Clears the symbol.

Undefine *

Clears all defined symbols.

Example: Undefining symbols

Undefine Show

Clears the symbol Show.

Important guidelines

When creating symbols, keep the following in mind:



FactoryTalk View does not check for security access on symbol names.

Therefore, be sure to put security on the underlying FactoryTalk View

command. For information about setting up security, see Setting up

security on page 85.



If a symbol and a macro have the same name, the symbol runs instead

of the macro.

The order of precedence is: symbol, command, macro.

Use the command line to run commands during application development,

testing, and maintenance.

Use the Command Wizard to build command strings.

Running and

building commands

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The Command Wizard lists all FactoryTalk View commands and their

syntax. The wizard also lists any macros that you have created.

For details about using the Command Wizard, and about individual

FactoryTalk View commands, see Help.

To open the command line:

In FactoryTalk View Studio, in the Explorer window, double-click the

Command Line icon.

To open the Command Wizard:

Use one of these methods:



Double-click in an action box, or anywhere in the Macro editor.



Click the Browse button beside an action box or any box requiring a

FactoryTalk View command.

In the Command Line, Runtime Secured Commands editor, Events

editor, and Macro editor, from the Edit menu, select Commands.

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Chapter 26

Setting up DDE communications

for HMI tags

This appendix describes:



What DDE communications are.



How to set up DDE communications with HMI tags.



Scanning for new tag values.

Tip:

This section does not apply to Microsoft Windows 7

Professional or Windows Server 2008.

To support legacy applications FactoryTalk View supports DDE

communications.

The following illustration shows how FactoryTalk View SE might use DDE.

Overview of DDE

communications

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DDE (Dynamic Data Exchange), used with external DDE servers such as the

Rockwell Software RSServer products, or with other third-party servers,

allows applications to communicate with a wide range of local and remote

devices.

DDE servers provide a way to c

onnect to an HMI server’s HMI tags (the

DDE client), to communication devices such as Siemens or Modicon, or to

third-party DDE servers such as Microsoft Excel or Visual Basic.

These are the tasks involved in setting up an HMI server as a DDE client:

1. Start the DDE server.

2. Start FactoryTalk View Studio, and then create or open an application

(the DDE client).

3. In the Tags editor, create tags. Select Device as the data source. In the

Address box, type the required DDE address. For information about

DDE addressing syntax, see Syntax for DDE addresses on page 659.

Tip:

If the DDE server is running as an application instead of

as a service, for more information, see Answer ID 26798

in the Rockwell Automation KnowledgeBase.

Creating an HMI tag that uses DDE

This section describes how to complete the Data Source options in the Tags

editor for tags that use DDE communications.

For details about creating HMI tags, see Help. For information about

working with tags, see Working with tags on page 189.

Specifying Device as the data source

An HMI tag with Device as its data source receives its data from a source

external to FactoryTalk View. This section describes how to create tags for

data that comes from:



Programmable controllers through a DDE server.



Another Windows program through a DDE server.

Setting up an HMI

server as a DDE

client

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To create a tag with Device as the data source:

1. For the data source Type, select Device.

2. In the Address box, specify the DDE item.

Type the DDE address for the tag. The DDE item name and format

depend on the DDE server, and are not validated by FactoryTalk View.

Syntax for DDE addresses

The syntax for DDE tag addresses is:

DDE : Application|Topic!Item

There are no spaces:



Between the application name, the vertical bar, and the topic name.



Between the topic name, the exclamation mark, and the item name.

For more information about addressing syntax, see the documentation

supplied with the DDE server.

When an HMI server containing tags is running, it must periodically update

its tag values in the value table.

For applications using DDE, values are updated by the server at the rate

specified in the server product. When the server detects a change, it provides

the changed value to FactoryTalk View.

For details about setting the poll rate, see the server documentation.

Scanning for new

tag values

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