# Logging - Part 2: Function Block Setup

### 1. Control Function Block:

The control [function block](https://docs.intrepidcs.com/vspy-3-documentation/3.26.2/vehicle-spy-main-menus/main-menu-scripting-and-automation/function-blocks/function-blocks-types/script-type-function-block) is a script that will tell the capture function block to change partitions when the trigger condition is met.  There are a number of ways to do this script.  The basic functionality would be to:<br>

1. Set your index
2. Wait for condition to change partition
3. Change partition
4. Make sure you are accessing a valid partition

The script in the example is shown below.&#x20;

![](https://content.gitbook.com/content/IBP8B63pA3aIRGlHBRyH/blobs/Z66bPmx5IhPPlaGl2OT1/appnotCMPartControl.gif)


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