Tag database from file options matrix

Auto Load Tags on Startup

(Configurable parameter in the editor)

The tag database will be uploaded as soon as the Communication Driver is activated. The Communication Driver will attempt to connect to the device only one time. If the device is not connected, it will retry when the first item is subscribed.

The tag database will be uploaded as soon as the first device item is subscribed.

The system item $SYS$UpdateTagInfo can not be used to trigger a tag database upload until the first device item is subscribed.

Auto Synchronize Tags

(Configurable parameter in the editor)

The tag database in the Communication Driver will be synchronized periodically with the device. If the device is secured, the Communication Driver will not be able to automatically synchronize the tag database.

Note: If the optimization option is set for Optimize for startup time, the value is always True. In this case, the Communication Driver needs to synchronize the physical addresses of tags from the device.

The tag database in the Communication Driver will not be synchronized with the device.

The system item $SYS$UpdateTagInfo can be used to synchronize the tag database manually.

Use Persisted Tags

The Communication Driver will read the tags from the tag database file. If the file does not exist, it will then read the tags from the controller and store them into a file under bin\CIPTagDB directory.

If the controller is unsecured and the database version is different from the controller version, then the Communication Driver will read the tags from the controller and store them into a file.

The system item $SYS$UpdateTagInfo can be used to force the tag database upload from the device.

Note: If the optimization option is Optimize for startup time, the physical address of the tags will also be stored in the file.

The Communication Driver will always upload the tag database from the device and store them in to a file.

$SYS$UpdateTagInfo

(System item can be accessed by any client application)

The tag database will be uploaded from the device if value True is poked to this item.

This system item is provided for manual synchronization of the tag database. If the device is secured, use this item to synchronize tag database.

Note: If Use Persisted Tags is enabled, the original file will be renamed to <####>_temp.aaTDB (where ### represent the serial number of the device). If the Communication Driver fails to upload tags from the device, it will use the renamed file to recover the database. The temporary file (<####>_temp.aaTDB) will be deleted, after the tag database is uploaded successfully.

Poking the value False will not affect the tag database.