Backing Up, Saving, And Restoring Offset/Gain Values; When A Module-Specific Backup Parameters Is Used - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.18
Backing up, Saving, and Restoring Offset/Gain
Values
The D/A converter module is capable of backing up, saving, and restoring offset/gain values of the user range.
• Backup: 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 D/A converter module fails and needs to be replaced, the offset/gain values of the failed D/A converter
module can be restored onto the replaced D/A converter module.
In addition, if multiple D/A converter modules are connected on a system, the offset/gain settings in one of the D/A converter
modules can be applied to the other modules.
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 a module-specific backup parameters is used

At the time of replacement by means of online module change, the offset/gain values are automatically restored.
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 flash memory of the D/A converter
module.
The file name of a module-specific backup parameter is determined as follows based on the start I/O number of the D/A
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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1.18 Backing up, Saving, and Restoring Offset/Gain Values