Mitsubishi Electric MELSEC iQ-R Series User Manual page 94

■Saving and restoring by reading from and writing to the buffer memory
Use Save data type setting, CH1 Factory default setting offset value to CH8 User range setting gain value, and 'User range
write request' (YA) to read the offset/gain values from the source D/A converter module. Use the buffer memory again to write
the values to the destination D/A converter module.
The following describes the procedure for using the buffer memory.
• To restore offset/gain values onto a new replaced module:
When offset/gain
values are restored
onto the source D/A
converter module
When the power of the
module is off
When offset/gain
values are restored
onto the destination D/
A converter module
When replacing modules, prevent the saved offset/gain setting data from being deleted, by one of the
following methods before powering off the module.
• Use latch settings for the internal device of the destination module.
• Save the data onto an SD memory card. (To write data: use the SP.FWRITE instruction. To read data: use
the SP.FREAD instruction.)
• Store the saved data.
• To apply the offset/gain values set in one module to the other modules in the same system:
When offset/gain
values are restored
onto the source D/A
converter module
When offset/gain
values are restored
onto the destination D/
A converter module
1 FUNCTIONS
92
1.18 Backing up, Saving, and Restoring Offset/Gain Values
 Set Save data type setting.
 Turn on and off 'Operating condition setting request' (Y9).
 Save the stored values of Save data type setting and CH1 Factory default setting offset value to CH8 User range setting gain
value.
 Replace the D/A converter module.
 Write the data saved in Save data type setting and CH1 Factory default setting offset value to CH8 User range setting gain value.
 Turn on 'User range write request' (YA).
 Check that 'Offset/gain setting mode status flag' (XA) is on.
 Turn on and off 'User range write request' (YA).
 Check whether the destination D/A converter module operates with the offset/gain values that are restored.
 Set Save data type setting.
 Turn on and off 'Operating condition setting request' (Y9).
 Save the stored values of Save data type setting and CH1 Factory default setting offset value to CH8 User range setting gain
value.
 Write the data saved in Save data type setting and CH1 Factory default setting offset value to CH8 User range setting gain value.
 Turn on 'User range write request' (YA).
 Check that 'Offset/gain setting mode status flag' (XA) is on.
 Turn on and off 'User range write request' (YA).
 Check whether the destination D/A converter module operates with the offset/gain values that are restored.