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1 FUNCTIONS
1.16 Backing up, Saving, and Restoring Offset/Gain Values
1.16 Backing up, Saving, and Restoring Offset/Gain
Values
The A/D converter module makes it possible to back up, save, and restore the offset/gain values of the user range setting.
• Back up: Creates a module-specific backup parameter and saves offset/gain values.
• Save: Saves the offset/gain information, registered in this module by making the offset/gain setting, in the CPU module.
• Restoration: Writes the information backed up and saved in the CPU module to this module.
In the event that the A/D converter module fails and needs to be replaced, the offset/gain values of the failed A/D converter
module can be restored onto the new A/D converter module.
However, if the offset/gain values are saved and restored, the accuracy after the restoration decreases by approximately three
times compared to that before the restoration. Reconfigure the offset/gain setting when required.
Only when the model where the offset/gain values are to be saved and the model where the offset/gain values are to be
restored are the same, the offset/gain values can be saved and restored.
Each procedure differs depending on whether a module-specific backup parameter is used or not.
When the module-specific backup parameter is used
Offset/gain values are automatically restored when the failed module is replaced with a new one using the online module
change.
For details on the online module change, refer to the following.
MELSEC iQ-R Online Module Change Manual
Details of the module-specific backup parameter
A module-specific backup parameter is a file created in an SD memory card or the data memory of the control CPU. The
contents of the parameter are the offset/gain value of the user range stored in the non-volatile memory of the A/D converter
module.
The file name of a module-specific backup parameter is determined as follows based on the start I/O number of the A/D
converter module.
UBPmmmnn.BPR
• mmm indicates a value calculated by dividing the module I/O No. by 10H (3 digits in hexadecimal).
• nn indicates a consecutive number of the module-specific backup parameters for each module and fixed to 00.
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