2.3 About the Display Unit's Internal Data

Saves data generated or retrieved by screens and features. The save area capacity depends on your display unit model.

Uses this area when you use fonts in addition to the fixed system fonts. If you exceed the available area, then uses the screen area.

You cannot use the font area in the following models. Uses the screen area when you use other fonts in addition to the fixed fonts.
GP-32** Series
GP-4100 Series
GP-4201TM and GP-4301TM
ST3000 Series

This memory saves data even when the display unit is turned OFF.
The priority when storing data in this memory area is as follows.

To check the backup memory (SRAM) usage, from the [Project (F)] menu, point to [Information (I)], select [Project Information (I)], and then select [SRAM Information].

Data in backup memory (SRAM) is preserved by the display unit's built-in backup battery. Data is lost if the battery is drained.
For display units with rechargeable batteries, supply power to the unit and fully recharge the batteries. Battery will be charged up to the level at which it can run backup 24 hours after the power is turned ON. A complete recharge requires 96 hours (4 days).
For display units with non-rechargeable batteries, an error message appears to indicate when to replace. When replacing batteries, refer to the hardware manual for the display unit.
For displayed error messages, refer to the following.
T.7.1 Settings common to all Display models
Data in backup memory (SRAM) is erased on:
- Transfer Project (Send Project)
- Offline mode's [Initialize User Memory]
- Offline mode's [Initialize Backup SRAM]
When you want to preserve data in the backup memory (SRAM) during screen transfer and other operations, you can back up the data in the backup memory (SRAM) to a CF/SD card, and then return to the display unit after screen transfer is complete.
However, if in the meantime you transfer a project with a change in how the backup memory (SRAM) feature is used, you will not be able to return the backup data to the display unit as the CF/SD card backup data will not match the project.
For information on the CF/SD card backup process, refer to the following.
5.4.4.4 Display Unit [Mode] - Memory Card Settings
Maintenance/Troubleshooting Guide, M.16.7.3 Transfer - Transfer from SRAM to CF/Transfer from SRAM to SD
Maintenance/Troubleshooting Guide, M.16.7.2 Transfer - Transfer from CF to SRAM/Transfer from SD to SRAM

Since the models in the GP-4100 series are not equipped with backup memory (SRAM), part of the internal memory is used as the backup area. User documents refer to this area as "virtual backup memory".
Data in virtual backup memory, just like backup memory (SRAM), is preserved even when the display unit is turned off and on again. On the GP-4100 Series, if you run alarm history, recipe (filing data), or change the brightness/contrast, associated data is saved to virtual backup memory.

This memory is used for temporary storage and all data stored here will be erased when the display unit is turned OFF or reset.

Data in working memory is erased on:
- Turning OFF the display unit
- Resetting the display unit
- Transfer Project (Send Project)
- Offline mode's [Initialize User Memory]

Device registers available inside the display unit. These are temporary storage locations for saving data such as the values operated on or controlled in the display unit.

Data in the internal device is erased on:
- Turning OFF the display unit
- Resetting the display unit
- Transfer Project (Send Project)
- Going to offline mode

You can back up the User Area's internal device data to backup memory (SRAM). From the [System Settings] click [Display Unit], and in the [Mode] tab define the settings in the [Backup Internal Device] area.
5.4.4.3 Display Unit [Mode] - Backup Internal Device
The internal device area you can use differs from the device/PLC communication format (Direct Access or Memory Link methods). For more details, please refer to the following.
2.4 Device/PLC Communication
When using two communication methods, the LS Area and the Memory Link Area are mutually linked, with the exception of some addresses. For more details, please refer to the following.
A.1.3.3 Restrictions When Using Direct Access and Memory Link Together

When attaching the GP3000 series Function Expansion Memory, you can expand various features and settings. For information about models that support added options, see the following.

1.5 Supported Features