Appendix H Optional Functions
H.3 Battery Backup for Table Data
A-129
H.3 Battery Backup for Table Data
( 1 ) Overview of Functions
For the MP2000 Series, one table consists of the following three types of data.
1. Table definitions (e.g., definitions of table name, table type, number of columns, and number of rows)
2. Attribute definitions (e.g., definitions for column names, data type (size), and table type)
3. Table data
Normally, the data listed above is placed in volatile memory in the same way as drawings. Therefore, data will not be
held the next time operation is started unless the data has been saved to flash memory. To back up the data when the
power supply is turned OFF, you can place the table data (item number three above) into memory that is backed up
with a battery. This is called “battery backup memory.” You can access table data that has been backed up using this
function by following normal table data operation instructions.
( 2 ) Supported Versions
• Controller: Version 2.32 or later
• MPE720: Version 5.21 or later
• MPE720 Version 6: All versions
( 3 ) Battery Backup Memory Capacity
Capacity of battery backup memory: 512 KB (including data used by the system)
( 4 ) System Registers for Battery Backup Memory Capacity
Data related to battery backup memory is stored in the system registers given in the following table.
Name Register Number Remarks
Battery Backup Memory Remaining Capacity SL00640
Bytes
Battery Backup Memory Total Capacity SL00642
Bytes
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