Mitsubishi Electric MELSEC iQ-R Series User Manual page 316

Precautions during control
• Data can only be written to the flash ROM when the positioning control is not carried out (when the PLC READY signal [Y0]
is OFF). The warning "In PLC READY" (warning code: 0D05H) will occur if executed when the PLC READY signal [Y0] is
ON.
• Writing to the flash ROM can be executed up to 100,000 times. If writing to the flash ROM exceeds 100,000 times, the
writing may become impossible, and the error "Flash ROM write error" (error code: 1A31H) will occur.
• After the power supply is turned ON or the CPU module is reset once, writing to the flash ROM using a program is limited to
up to 25 times. If the 26th writing is executed, the error "Flash ROM write number error" (error code: 1080H) will occur. If
this error occurs, carry out the error reset or power OFF  ON/CPU module reset operation again.
The writing time to the flash ROM is approximately 5 seconds. When a short time is assigned to the main
cycle
Do not turn the power ON/OFF or reset the CPU module during executing the flash ROM writing.
If the power is turned OFF or the CPU module is reset to forcibly end the process, the data backed up in the
flash ROM/internal memory (nonvolatile) will be lost.
*1 Cycle of processing executed at free time except for the positioning control. It changes by status of axis start.
Execution data backup method
• Refer to the following for the data transmission processing at the backup of the execution data.
Page 554 Data transmission process
• Execution data backup can be carried out by writing the data shown in the table below to the buffer memory of Motion
module. The writing to the flash ROM/internal memory (nonvolatile) is executed at the time point the data is written to the
buffer memory of Motion module.
Setting item
[Cd.1] Flash ROM write request
Refer to the following for the setting details.
Page 512 Control Data
When the writing to the flash ROM/internal memory (nonvolatile) is complete, "0" will be set in "[Cd.1] Flash ROM write
request" by the Motion module automatically.
9 COMMON FUNCTIONS
314
9.3 Execution Data Backup Function
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*1
, writing may take more than 5 seconds.
Setting
value
1
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Setting details
Set "1: Requests write access to flash ROM.".
Buffer memory address
Axis 1 to axis 16
5900