Data Transmission Process; Data Transmission Process For Operation - Mitsubishi Electric MELSEC Q Series User Manual

6 DATA USED FOR POSITIONING CONTROL

6.2 Data Transmission Process

6.2.1 Data transmission process for operation

FROM(P) instruction, DFRO(P) instruction
MOV(P) instruction, DMOV(P) instruction
QD74MH
Internal memory
Parameter
PLC READY ON
Parameter change request
Servo parameter change
(Note-1)
(Note-1): When the parameters are chenged by the auto tuning or MR Configurator,
the servo parameters are read to the buffer memory of QD74MH.
The data can be transmitted with steps (1) to (6) shown below.
(1) Transmitting data when power is turned ON or PLC CPU is reset
(a) Data stored (backed up) in the flash ROM can be transmitted to the buffer
memory. (Refer to Section 10.22)
POINT
Communication with servo amplifier cannot be executed at the system power
supply ON. (The servo parameter can be transmitted from the flash ROM to the
buffer memory at the system power supply ON, however, they can not be
transmitted to the servo amplifiers.)
Communication starts with servo amplifier at the PLC READY ON (first time only).
(2) Transmitting data with command from PLC CPU
The parameters or control data can be written from the PLC CPU to the buffer
memory using the commands (TO(P) instruction, DTO(P) instruction, MOV(P)
instruction or DMOV(P) instruction).
PLC CPU
TO(P) instruction, DTO(P) instruction
MOV(P) instruction, DMOV(P) instruction
Buffer memory
System power supply ON/
Parameter Reset of the PLC CPU
Positioning data
Servo parameter
"1" is set in "
ROM write request".
Monitor data
Control data
Interface for
communication with
servo amplifier
Communication start with servo amplifier
(PLC READY ON (First time only))
Servo amplifier
6 - 3
MELSEC-Q
Flash ROM
Parameter
Positioning data
Servo parameter
Flash
Cd.100