The functions of the internal variable determine the actions to be taken when the corresponding logical condition is fulfilled. Up to 6 IV functions can be set, while an IV function can start other IV function.

The IV functions are configured as follows:

1. Go to the Apollo Internal Variable object settings panel.
   
2. Select the required function in the corresponding drop-down list (1, see table).

3. Click ... and configure the function parameters (2, see table).

   Function	Description	Parameters
   AIO output control	Switch relay on AIO security panel	Security panel Panel relay
   Reader relay control	Switch relay of a reader connected to an AIM controller	AIM controller Reader Relay
   APB Area control	Change APB area state	APB Area
   Create IV call log	Logging a message about fulfillment of conditions of the internal variable	-
   Unlock/select reader mode	Setting operation mode of a reader connected to an AIM controller	AIM controller Reader type Mode
   Call of other IV functions	Performing functions of another internal variable, regardless of the meaning of its terms	Variable

4. Click Apply (3).
5. To save the changes to the controller, Write configuration to hardware.