# Switching Controller Software

Updating and switching controller software are two different tasks that are tightly connected. The controller can have two different software versions installed, one active version and one passive version. It is a simple process to switch between the two versions. Switching controller software is the task that switches active and passive software.

## Activating Stored Software in the Controller

1. Select the System administration tab in the left-side menu bar.

2. Go to Controller software and data management .

3. Select the check box for the controller. It is only possible to execute the command if the controller is online.

4. Select Software then Activate stored Software from the drop-down menu.

5. The Software update column in the workspace will show the following messages:

   1. Activating stored software.

   2. Stored software activated, controller restarting.