Absolute Position System - Mitsubishi Electric RD77MS2 User Manual

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.
• Position command
• Control command
• Servo parameter
CPU
module
• Monitor data
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
Item
Absolute position detection system (PA03)
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
[Cd.3] Positioning
start No.
Positioning start
[Y10 to Y13]
8 CONTROL SUB FUNCTIONS
268
8.7 Absolute Position System
• Position command
Simple
• Control command
Motion
• Servo parameter
module
Home
position
• Monitor data
return
address
Return of the present value
Buffer memory address
28403+100n
Movement range for the machine
Moved to this position by
manual operation.
The stop position during home position return execution
is stored as the home position return position.
9001 (Home position return destination)
Battery
Servomotor
Servo amplifier
Back-up
Absolute position detector
M
Encoder