Module Data Backup Function - Mitsubishi Electric MELSEC iQ-R-RD75P4 User Manual

8.3

Module Data Backup Function

When buffer memory data is rewritten with programs or others, the setting values in the module extension parameter file and
the execution data being used in control (buffer memory data) may differ. In cases like this, the execution data will be lost if the
CPU module is powered off.
For the cases like this, the module data backup function writes the execution data into the module extension parameter file
and backs up the data. The data in the module extension parameter file that was backed up will be written into the buffer
memory when the power is turned on next time.
Module backing up means
This function is executed with a program.
Control details
The following table lists the data that can be backed up with the module data backup function.
*1
Parameter
Module parameter
Module extension parameter
*1 For the parameter file, refer to the following.
Page 488 Parameter Reflection
*2 The storage destination of module extension parameters is specified by the extension parameter storage setting. For details, refer to the
following.
Page 487 Extended parameter storage setting
*3 The module data backup can be performed only while the CPU module status is STOP.
Control precautions
• Write data into the flash ROM only when the positioning control is not performed (when PLC READY signal [Y0] is off). If
the initialization is executed while PLC READY signal [Y0] is on, PLC READY ON write (Warning code: 0905H) will occur.
• Writing to the flash ROM can be executed up to 100000 times. If the number of writing to the flash ROM exceeds 100000
times, writing data to the flash ROM may become impossible and Flash ROM write error (Error code: 1931H) will occur.
• The number of module data backups using a program after the power is turned on once or the CPU module is reset is
limited to up to 25 times (including the number of executions of the module data initialization function). If the writing
operation is executed 26th times, Flash ROM write number error (Error code: 1080H) will occur. If this error occurs, reset
the error, power off and on the module again, or reset the CPU module.
Control restrictions
• When the extension parameter storage setting has been set to "CPU", the module data backup can be performed only
while the CPU module status is STOP. Use "[Cd.1] Module data backup request" for the module data backup.
• Do not turn on and off the power or reset the CPU module during the writing processing to the flash ROM. Doing so cancels
the flash ROM write and the backed up data will be lost.
8 COMMON FUNCTIONS
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8.3 Module Data Backup Function
Extension parameter storage setting
CPU module
No data is backed up.
The module extension parameters in the buffer memory
are backed up in the module extension parameter file of
*3
the CPU module.
*2
Positioning module
The module extension parameters in the buffer memory
are backed up in the module extension parameter file of
the positioning module.