9
Absolute Position Detection
9.1.1
Outline of the Function
9-2
9.1 Absolute Position Detection Function
This section explains the Absolute Position Detection Function in the MP2300.
9.1.1 Outline of the Function
The Absolute Position Detection Function detects the position of the machine (axis) even if the
power is turned OFF. This allows it to establish the machine coordinate system automatically and to
begin operating automatically without having to execute the zero point return (ZRET) command after
power is turned ON.
Absolute position detection is performed using an absolute encoder built into a Servomotor.
The following are features of the system for detection of the absolute position.
• If eliminates the need for a zero point return after the power is turned ON.
• If eliminates the need for a zero point dog and overtravel limit switch.
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Terminology: Absolute Encoder
There are two types of encoders available. An incremental encoder detects position by calculating the
zero point difference. An absolute encoder detects the absolute position relative to a reference posi-
tion.
The absolute encoder uses a battery connected to the battery terminals of the SERVOPACK to main-
tain absolute data at all times even though power is turned OFF. It also updates absolute data if the
position changes while the power is OFF.
The absolute encoder is comprised of a detector that is used to detect absolute position within one
rotation and a counter that is used to count the number of rotations.
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After the automatic operation starts, the absolute encoder operates in the same way as an incre-
mental encoder.
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