Download dialog box - Options tab parameters
Use the settings on the
Download dialog box - Options
tab to prevent tag values in an online controller from being overwritten during the download process. This functionality is disabled by default and must be enabled for each download.
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The
Download dialog box - Options
tab is available only on Compact GuardLogix 5380, CompactLogix 5380, CompactLogix 5480, GuardLogix 5580, and ControlLogix 5580 controllers.This table describes the settings on the
Options
tab. Setting | Description |
|---|---|
Preserve online tag values | Creates a snapshot of the online controller’s tag memory before the download takes place, and restores the tag memory before the download is finalized. To save the tag memory snapshot as an XML file for re-use, select Backup to file . Enter a location to save the snapshot.If a download fails or is cancelled, the snapshot is stored in a temporary file at an operating system specific location, depending on the TEMP environment variable setting (typically [user]\AppData\Local\Temp).
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f the controller is offline and you update the structure of a user-defined data type, tags of that user-defined data type will not have their values preserved during the next download.
|
Restore online tag values from file | After the download, the controller restores the tag memory using a snapshot file. Enter the location of the snapshot file. |
The following data types in both controller and program local scope are supported for preserving and restoring tag memory:
- Add-On Instruction
- ALARM_SET_CONTROL
- User-DefinedNOTE: If the controller is offline and you update the structure of a user-defined data type, tags of that user-defined data type will not have their values preserved during the next download.
- BOOL
- COUNTER
- CONTROL
- DINT
- UDINT
- INT
- UINT
- LINT
- ULINT
- PAX_HART_DEVICE:I:0
- PID
- PIDE_AUTOTUNE
- Process Instructions
- SINT
- USINT
- REAL
- LREAL
- STRING
- TIMER
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