Buffer Memory Data Backup Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.36

Buffer Memory Data Backup Function

This function backs up data in buffer memory areas to the non-volatile memory.
The backed up data is transferred from the non-volatile memory to the buffer memory when the power is turned from OFF to
ON or the CPU module is reset and the reset is canceled. Thus, temperatures can be controlled without writing data when the
power is turned OFF and ON or the CPU module is reset and the reset is canceled.
Target buffer memory areas
Refer to the list of buffer memory addresses. ( Page 167 List of buffer memory addresses)
Writing data to the non-volatile memory
This function can be used to back up the data that was directly written to the buffer memory areas using the PID constants set
by the auto tuning function and the engineering tool. When the data is written to the non-volatile memory and the power is
turned OFF and ON or the CPU module is reset and the reset is canceled, the values in the buffer memory areas are not
required to be set again.
For the functions whose PID constants are automatically backed up after the auto tuning, refer to the
following:
Page 167 List of buffer memory addresses
To write data to the non-volatile memory, turn from OFF to ON 'Setting value backup command' (Y8).
When writing the data to the non-volatile memory is completed, 'Setting value backup completion flag' (X8) turns ON.
1. 'Setting value backup
CPU module
command' (Y8): ON
(Write command)
3. 'Setting value backup
completion flag' (X8): ON
(Completed)
If writing the data to the non-volatile memory is not completed successfully, 'Setting value backup failure flag' (XA) turns ON.
■Setting change
Change the settings of the buffer memory areas while 'Setting value backup completion flag' (X8) is OFF.
■Reading data from the non-volatile memory
Data can be read by the following methods:
• Turning OFF and ON the power, or resetting the CPU module and canceling the reset
• Setting 'CH1 Memory's PID constants read command' (Un\G440) to Requested (1) (However, the data to be read is only
the PID constants and the loop disconnection detection judgment time of the corresponding channels.)
• Setting 'CH1 Feed forward value memory read command' (Un\G441) to Requested (1) (However, the data to be read is
only the feed forward values of the corresponding channels.)
Temperature control module
OS
2. Write
Buffer memory
data
Read
When the power is
turned off and on,
or at reset
Non-volatile memory
1 FUNCTIONS
1.36 Buffer Memory Data Backup Function
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