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MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.6 Absolute position restoration function
The "absolute position restoration function" restores the absolute position of the axis
automatically at power-on of the AD75 by an absolute position detection system.
This function eliminates the need for a zero point return after power-off, such as an
instantaneous power failure or emergency stop, facilitating on-site recovery.
12.6.1 Outline of absolute position restoration function
The following details will be explained for the "absolute position restoration function".
[1] Configuration and preparations of absolute position detection system
[2] Outline of absolute position detection data communication
[3] Precautions during control
[1] Configuration and preparations of absolute position detection system
(1) Configuration
The following shows the configuration of an absolute position detection system.
Servo
amplifier
Detector cable
Absolute position holding battery
SSCNET cable
1)
2)
3)
Servomotor with absolute position detector
SSCNET
AD
75
*
Power supply
PLC
CPU
* Set "1: Absolute position detection valid" to "
Pr.101
Amplifier setting".
Fig. 12.31 Absolute position detection system configuration
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