### OPC Server Settings

It is possible to create custom device type definitions for OPC, customize the default device type definitions for OPC, and customize `DefaultMeasurements.xml`.

To recreate custom device type definitions for OPC:

1. Check the `CM Migration Files` folder to see if there are any custom device type definitions for OPC.
2. In Windows Explorer, navigate to `...\system\IONServices\DefaultMeasurementsExt\` and copy the custom device type definition XML files that you want to include to the new system.

To recreate customized default device type extension files for OPC:

1. In Windows Explorer, navigate to `...\system\IONServices\DefaultMeasurementsExt\`.
2. Check the default device type extension XML files from the source in the `CM Migration Files` folder.
3. Recreate the customized default device type definitions that you want to include to the new system.

To recreate customizations in `DefaultMeasurements.xml`:

1. Check the `DefaultMeasurements.xml` copied to the `CM Migration Files` folder to see if it was customized.
2. In Windows Explorer, navigate to `...\system\IONServices\`.
3. From a sub directory, duplicate an existing OPC `ext.xml` file.

   Note: These files are merged in memory into the master `DefaultMeasurements.xml` file without needing to modify the master file.

4. Open the file, delete the content of the original device and then replace it with the new device content.
5. Save the file.