Mitsubishi MELSEC-Q QD77MS - Absolute Position System

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Chapter 13 Control Sub Functions
13.6 Absolute position system
The QD77MS can construct an absolute position system by installing the absolute
position system and connecting it through SSCNET
/H.
The following describes precautions when constructing the absolute position system.
Servomotor
Servo amplifier
Position command
Control command
Servo parameter
QD77MS
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. 13.35 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, the "Absolute
position detection system (PA03)" is selected "1: Valid" in the amplifier setting for
the servo parameters (basic setting).
Buffer memory address
QD77MS2/QD77MS4 QD77MS16
Absolute position detection system (PA03) 30103+200n 28403+100n
n: Axis No.-1