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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.6 Absolute position system
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.
Servomotor
Servo amplifier
Position command
Control command
Servo parameter
QD75
Monitor data
PLC
CPU
OPR
address
M
PLG
Absolute position detector
Back-up
Return of the present value
Battery
Position command
Control command
Servo parameter
Monitor data
Fig. 12.32 Configuration of absolute position detection 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 No. Axis 1 Axis 2 Axis 3 Axis 4
Buffer memory 30101 30201 30301 30401
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