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Logical Exchange GVL

A Logical Exchange GVL is the object of the standard application that ensures the data exchange with the safety application. The Logical Exchange GVL is connected for the data exchange with a suitable logical I/O of the safety application.

The exchange variables can be edited only in the Logical exchange device of the safety application. Variables cannot be entered or changed in the Logical Exchange GVL (Logical Exchange GVL – Editor).

Only data whose variables possess a standard data type can be exchanged. Variables of a data type with the prefix SAFE cannot be exchanged between a safety controller and a standard controller.

Adding Logical Exchange GVL

  1. Select the default application object in the project tree

  2. In the context menu, click Insert object and select Logical Exchange GVL.

  3. A name can be edited for the GVL in the Add Logical Exchange GVL dialog. The default name is Logical_GVL.

  4. Click the Add button.

Connection of the Logical Exchange GVL with the Logical exchange device object of the safety application

  1. Select logical exchange GVL of the default application in the project tree

  2. Click Edit object in the context menu.

  3. Click the Logical Exchange Mapping combo box

  4. Select the corresponding logical exchange object from the list that opens (example: Logical_exchange_object_INT_1xIn.

All logical exchange objects that have not yet been mapped are available in the combo box.

If a logical exchange device is selected, then the variables are implicitly updated.

If changes are made in the connected logical exchange device, then the Update button in the logical exchange GVL must be clicked in order to update the variable list.

An existing connection is terminated by clicking the Reset button.

Notes on the exchange of data between the standard and safety controllers

A change of the variable exchange can only become active by downloading the safety application and the default application again.

Substitute values

Substitute values are used for variable exchange as long as the application has not been terminated but no current values can presently be exchanged (see Safety User Manual "Coordination with the Standard Controller").

Type consistency of the I/O channels

Important

The type consistency of the I/O channels is guaranteed only if the application revision levels on the safety controller and on the standard controller correspond to the revision level of the same translatable project.

Object properties

The properties dialog of a GVL contains the tabs Common and Access Control.

For more detailed information about these tabs, see Object properties.

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