186
7-4-8 One Direction-mode Origin Searches 3
These origin searches are performed without an origin proximity switch and the
initial search direction set to CW.
Limit switches
Z-phase signal
Speed
CWCCW
7-5 Overview of Absolute Encoders
Overview The absolute encoder retains absolute data by using the backup battery when
the MC Unit is turned OFF. When the MC Unit is turned ON again, the absolute
data can be read from the absolute encoder to determine the current position.
No origin search is required.
MC Unit
SEN signal
Absolute data
Battery
Servodriver
Motor (absolute encoder)
Backup by battery
The MC Unit receives data from the absolute encoder by changing the SEN sig-
nal level from low to high.
Note For details on absolute encoder interfaces, refer to 7-8 Absolute Encoder Inter-
face Specifications.
The MC Unit receives absolute data by changing the SEN signal state from OFF
to ON when the Run Command Output to the Servodriver is changed from OFF
to ON.
The following Servomotors are provided with absolute encoders that can be
connected to the MC Unit.
OMRON U Series: R88M-UjjjjjS
R88M-UjjjjjT
Applicable Absolute
Encoders
Overview of Absolute Encoders
Section 7-5
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