# Enabling PCE

To enable your VisionPro application to use persistent camera enumeration, perform the following steps:

1. Close any open VisionPro application.
2. Edit the file %PUBLIC%/Cognex/Common/VPCameraOrder.ini and change the value of enable=false to enable=true.
3. Re-launch your VisionPro application with all GigE Vision cameras connected.

With persistent camera enumeration enabled, Cognex recommends you be aware of the following

- If you add more GigE Vision cameras to your application, VisionPro will modify the VPCameraOrder.ini initialization file the next time you launch VisionPro.
- The VPCameraOrder.ini initialization file contains the IP address of each original camera. If you later change the IP address using the GigE Vision Configurator, VisionPro will update the IP address in the initialization file the next time you launch VisionPro.
- QuickBuild contains an entry for all cameras in the initialization file, but does not distinguish which cameras are virtual and which are actually available for acquiring images.
- Be aware of the following behavior of the VisionPro installer regarding the VPCameraOrder.ini file:
  - If a VPCameraOrder.ini file is already present during an installation, the VisionPro installer renames the existing file VPCameraOrder.ini<current_date_time> and then installs the new VPCameraOrder.ini file in %PUBLIC%/Cognex/Common.
  - During an uninstall, the VisionPro installer renames the existing VPCameraOrder.ini file to VPCameraOrder.ini<current_date_time>.