Mitsubishi Electric MELSEC Q Series User Manual page 83

6 DATA USED FOR POSITIONING CONTROL
(3) PLC READY ON
(a) The buffer memory data of QD74MH can be taken to the internal memory.
(Refer to Section 6.4 for the parameters taken at the PLC READY ON.)
(b) The communication starts with servo amplifiers at the PLC READY ON (first
time only) after the system power supply ON, and the servo parameters to
the buffer memory can be transmitted from QD74MH to the servo amplifier.
POINT
If the backup of parameters in the flash ROM is unnecessary, set the parameters
required to the buffer memory of QD74MH with the sequence program before the
PLC READY ON after the system power supply ON.
(4) Accessing with command from PLC CPU
The data can be read from the buffer memory to the PLC CPU using the
commands (FROM(P) instruction, DFRO(P) instruction, MOV(P) instruction or
DMOV(P) instruction).
(5) Reading the servo parameter from the servo amplifier
When the parameters can be changed by the auto tuning etc. of servo amplifier,
the servo parameters can be read automatically from the servo amplifier to the
buffer memory.
Make the writing operation to the flash ROM to write the servo parameters to the
flash ROM. (Refer to Section 10.22.)
(6) Writing the flash ROM by PLC CPU request
The data can be backed up from the buffer memory to the flash ROM by setting
to "1" in "
Cd.100
Flash ROM write request".
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MELSEC-Q