# Software Menu

1. Select a controller in the Plant structure workspace .

2. Go to Controller .

   The workspace area displays the Controller menus.

Controller software version
Menu | Functionality
--- | ---
Current version | The main active working software.
Stored version | A stored inactive software.

It is possible to switch between installed software versions and this has two advantages:

- Controller software can be loaded to controllers in parallel to normal operation. If several controllers are to be updated, a switch can then be made very quickly on all controllers at the same time.

- If a software upgrade results in unexpected results, a switch to the previous version is a quick back-up fix.

Relevant Information

- Introduction to Controller Software and Data Management
- Switching Controller Software
- Updating Controller Software