Execution Data Backup Function - Mitsubishi Electric RD77MS2 User Manual

9.3

Execution Data Backup Function

When the buffer memory data of Simple Motion module is rewritten from the CPU module, "the data backed up in the flash
ROM/internal memory (nonvolatile)" of Simple Motion module may differ from "the execution data being used for control
(buffer memory data)". In this case, the execution data will be lost when the power supply of CPU module is turned OFF.
The "execution data backup function" is used to back up the execution data by writing to the flash ROM/internal memory
(nonvolatile). The data backed up will be written to the buffer memory when the power is turned ON next time.
Execution data backup means
• The backup is executed with a program.
• The data is written to the flash ROM by an engineering tool.
Refer to the "Simple Motion Module Setting Function Help" for the flash ROM write method by an engineering tool.
Control details
The following shows the data that can be written to the flash ROM/internal memory (nonvolatile) using the "execution data
backup function".
Buffer memory/Internal memory
Parameters
Positioning data
Block start data
Servo parameters
Input axis parameters
Synchronous encoder axis parameters
Main shaft/auxiliary shaft parameters
Main shaft/auxiliary shaft clutch parameters
Speed change gear parameters
Output axis parameters
Synchronous control initial position parameters
Mark detection setting parameters
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: 0905H) 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: 1931H) 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 up to 5 seconds. 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.
9 COMMON FUNCTIONS
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9.3 Execution Data Backup Function
Flash ROM/Internal memory (nonvolatile)
 Parameters
Positioning data
Block start data
Servo parameters
Input axis parameters
Synchronous encoder axis parameters
Main shaft/auxiliary shaft parameters
Main shaft/auxiliary shaft clutch parameters
Speed change gear parameters
Output axis parameters
Synchronous control initial position parameters
Mark detection setting parameters