> For the complete documentation index, see [llms.txt](https://docs.videc.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.videc.de/acron-9.3/en/anlagenkonfiguration/prozessanbindung/provider/providerid/treiberauswahl/dde_dynamic-data-exchange/dde_fast-f-intouch_inat-h1.md).

# DDE Fast for InTouch, Inat H1, ...

FAST-DDE is an event-controlled DDE and has been specified by the Wonderware company. However, as far as possible several individual communication messages between the DDE client and the DDE server are packed into a single message. The load on the system is lighter because there are fewer individual communication packets to be sent back and forth.

#### Background

The measurement data connection and the pulses for the service module are implemented by way of a FAST-DDE interface. Malfunctions and messages are imported via an add-on module.

#### Measurement data

On any change of a measured value, the ACRON Provider is notified and saves the value - and where appropriate the maximum and minimum - cyclically to the ACRON database.

#### Service variables

Where external variables are set for service triggering, the ACRON Provider is notified of any change by InTouch and reacts as follows:

If the value changes from ZERO to a different value, ACRON assumes that the unit has been switched on. If the value changes from not equal to ZERO to ZERO, ACRON assumes that the unit has been switched off.

#### Malfunctions and messages only for InTouch

The malfunction and message processing is implemented by way of the ACRON alert data interface. An InTouch add-on module tailored to ACRON (`wwextalm`) saves all alerts and messages to its database.

The setup program copies the `wwextalm.dll` file to the ACRON program directory. InTouch searches its directory for this DLL on startup, and calls its functions in response to every alert. This happens only for alerts of which the priority is less than or equal to the priority set under `">Special/Configure/Alarm Logging/Alarm Priority"`.

Note

To enable InTouch to find the DLL, the environment variable `PATH` must contain the ACRON installation path. This entry must be made manually under "Control Panel/System/Environment"!

Earlier installations were saved to the InTouch path. Be sure to delete the `WWEXTALM.DLL` file from that location!

#### Syntax of external variable

Name of InTouch variable or corresponding name from Inat DDE server

#### Import external variables

In order to import already defined variables and groups from the Wonderware "InTouch" control system, the InTouch configuration to a file of type `>*.csv` must first be stored using the `dbdump` utility included with the InTouch version. Before importing into ACRON, you must remove the unneeded variable names from the file and adapt the structure to the ACRON import format for external variables.

## Driver <a href="#treiber" id="treiber"></a>

### Driver file

Display the name of the selected driver and select a driver from the list of installed drivers

### Version

Version of the driver file

### Interface type

Display the driver interface type

### Data transfer type

Description of the data transfer type

## Driver parameters <a href="#treiberparameter" id="treiberparameter"></a>

### Service

For InTouch: View

Otherwise: DDE-Service ServiceSee relevant product documentation for DDE Server

### Topic

For InTouch: Tagname

Otherwise: DDE-Topic (program name of DDE Server without extension.)

## Settings <a href="#einstellungen" id="einstellungen"></a>

### Polling delay after start

Start of data logging in seconds after the ACRON Provider has successfully established process communication. This is useful, for example, if the opposite party takes some time after a restart to initialize all the variables.

Recommended entry: 10 - 20 sec.

### Always display provider window on top

Provider windows are always displayed on top

### Activate test mode

Display a window with diagnostic messages

On startup the ACRON Provider opens a window with diagnostic messages. The log file is stored under the relevant provider name in the ACRON installation path, in the "Log" directory.

Note

As diagnosis mode heavily influences the performance of the application, and the recorded messages can normally only be evaluated by Technical Support, you should only activate it when prompted to do so by Support.


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