Mitsubishi MELSEC-Q QD77MS, User Manual

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Chapter 14 Common Functions
14.3 Execution data backup function
When the QD77MS buffer memory data is rewritten from the PLC CPU, "the data
backed up in the QD77MS flash ROM/internal memory (nonvolatile)" may differ from
"the data (buffer memory data) for which control is being executed".
In cases like these, the data being executed will be lost when the PLC power is turned
OFF. (Refer to Chapter 7 "Memory Configuration and Data Process".)
In cases like these, the "execution data backup function" backs up the data being
executed by writing it to the flash ROM/internal memory (nonvolatile). The data that
was backed up is then written to the buffer memory when the power is turned ON next.
The details shown below explain about the "execution data backup function".
[1] Execution data backup (written to flash ROM) means
[2] Control details
[3] Precautions during control
[4] Execution data backup method
[1] Execution data backup (written to flash ROM) means
• The backup is executed with a sequence program.
• The backup is executed by GX Works2.
Refer to the "Simple Motion Module Setting Tool Help" of GX Works2 for
execution data backup method by GX Works2.
[2] 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 Flash ROM/Internal memory (nonvolatile)
Parameters (
Pr.1
to
Pr.57
,
Pr.80
to
Pr.97
) Parameters (
Pr.1
to
Pr.57
,
Pr.80
to
Pr.97
)
Positioning data (No. 1 to 600) Positioning data (No. 1 to 600)
Block start data (No. 7000 to 7004)
Block start data (No. 7000 to 7004)
Servo parameters
(
Pr.100
, PA, PB, PC, PD, PE, PS, PF, Po, PL)
Servo parameters
(
Pr.100
, PA, PB, PC, PD, PE, PS, PF, Po, PL)