Buffer Memory Data Backup Function - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Setting method
Configure the settings as described below.
1.
Set the judgment value for current error detection when outputs are OFF in "Heater disconnection alert settings" in"Loop
disconnection detection settings" in "Application Setting".
[Navigation window]  [Parameter]  Target module  [Module Parameter]  [Application Setting]  [Heater
disconnection detection setting]
2.
Set how many times current errors while outputs are OFF are detected successively to regard a current error while
outputs are OFF as having occurred in "Heater disconnection/output OFF-time current error detection delay count" of
"Heater disconnection detection setting" in "Application Setting".
4.34

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 OFF→ON or
the CPU module is reset. Consequently, when the power supply is turned OFF→ON and the CPU module is reset,
temperatures can be adjusted even if no data has been written.
Target buffer memory
Refer to the list of buffer memory allocations. (Page 99 List of buffer memory addresses)
See below for the functions whose PID constants are automatically backed up after the auto tuning.
Page 99 List of buffer memory addresses
To write data to the non-volatile memory, turn OFF and ON 'Setting value backup command' (Un\G399, b8).
When writing the data to the non-volatile memory is completed, 'Setting value backup completion flag' (Un\G398, b8) turns
ON.
1. "Set value backup command"
CPU module
(Un\G399, b8): ON (Write command)
3. "Set value backup completion flag"
(Un\G398, b8): ON (complete)
If writing the data to the non-volatile memory is not completed successfully, 'Setting value backup failure flag' (Un\G398, b10)
turns ON.
■Setting change
Change the settings of the buffer memory areas while 'Setting value backup completion flag' (Un\G398, b8) is OFF.
■Reading data from the non-volatile memory
Reading is enabled when the power supply is turned OFF→ON and the CPU module is reset.
■Precautions following implementation of the set value backup function
When the power supply is turned OFF→ON and the CPU module is reset after this function is implemented, the data
transferred to buffer memory is overwritten by the GX Works3 parameter settings.
To use the set values stored as the backup data of the initial settings of the module, implement one of the following actions.
• Do not set GX Works3 parameters
• When configuring the parameter setting of GX Works3, correct the set values of the parameters to the ones stored as
backup data, and write the parameters to the CPU module
4 FUNCTION
64
4.34 Buffer Memory Data Backup Function
Temperature control module
Buffer memory
data
2. Write
Read
When power is
turned OFF ON
During STOP RUN
During reset
Non-volatile memory