Mitsubishi Electric RD77MS2 - Absolute Position System

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8 CONTROL SUB FUNCTIONS
8.7 Absolute Position System
8.7 Absolute Position System
The Simple Motion module 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.
The configuration of the absolute position system is shown below.
Setting for absolute positions
For constructing an absolute position system, use a servo amplifier and a servomotor which enable absolute position
detection.
It is also necessary to install a battery for retaining the location of the home position return in the servo amplifier.
To use the absolute position system, select "1: Enabled (absolute position detection system)" in "Absolute position detection
system (PA03)" in the amplifier setting for the servo parameters (basic setting). Refer to each servo amplifier instruction
manual for details of the absolute position system.
n: Axis No. - 1
Home position return
The absolute position system can establish the home position using home position return methods as follows: "Data set
method", "Near-point dog method", "Count method" and "Scale origin signal detection method".
In the "Data set method" home position return method, the location to which the location of the home position is moved by
manual operation (JOG operation/manual pulse generator operation) is treated as the home position.
■RD77MS4 operation example
Item Buffer memory address
Absolute position detection system (PA03) 28403+100n
• Position command
• Control command
• Servo parameter
• Monitor data
• Position command
• Control command
• Servo parameter
• Monitor data
Battery
Servo amplifier
Encoder
M
Servomotor
Back-up
Return of the present value
Simple
Motion
module
Home
position
return
address
CPU
module
Absolute position detector
9001 (Home position return destination)
Movement range for the machine
[Cd.3] Positioning
start No.
Positioning start
[Y10 to Y13]
Moved to this position by
manual operation.
The stop position during home position return execution
is stored as the home position return position.