Absolute Position System - Mitsubishi Electric MELSEC-Q QD75M User Manual

12 CONTROL SUB FUNCTIONS

12.6 Absolute position system

PLC
CPU
Axis No.
Buffer memory
The QD75 can construct an absolute position system by installing the absolute position
system and connecting it through SSCNET.
The following describes precautions when constructing the absolute position system.
Position command
Control command
Servo parameter
Monitor data
Fig. 12.31 Configuration of absolute position system
[1] Setting for absolute positions
When constructing an absolute position system, use a servomotor with absolute
position detector.
It is also necessary to install a battery for retaining the location of the OPR in the
servo amplifier. When an absolute position detector is installed, select "absolute
value detector available" in the amplifier setting for the servo basic parameters.
Axis 1
30101
QD75
Position command
Control command
Servo parameter
OPR
address
Monitor data
Return of the present value
Axis 2 Axis 3
30201 30301
12 - 54
MELSEC-Q
Battery
Servo amplifier
Back-up
Absolute position detector
Axis 4
30401
Servomotor
M
PLG