When you use Citect SCADA's Migration Tool, the Remove obsolete Memory and Alarm devices option adjusts the following:
Memory tags to local variables: tags that are on an I/O device that are configured to use a 'memory' port.
Note: If there are real I/O devices in your project that have been set to use a 'memory' port during testing, these can be changed before running the migration tool to avoid those tags getting adjusted.
Alarm devices: can remove I/O devices that have a protocol set to 'Alarm', which was needed in earlier versions to enable alarm properties as tags. In version 7.x, the alarm properties are enabled via a setting on the alarm server configuration form.
Published June 2018