Absolute Linear Encoders; Connecting An Absolute Linear Encoder; Structure Of The Position Data Of The Absolute Linear Encoder; Reading The Position Data From The Absolute Linear Encoder - YASKAWA SGD7C-***AMAA*** Product Manual

5.25

Absolute Linear Encoders

The absolute linear encoder records the current position of the stop position even when the
power supply is OFF.
With a system that uses an absolute linear encoder, the Controller Section can monitor the cur-
rent position. Therefore, it is not necessary to perform an origin return operation when the
power supply to the system is turned ON.
There are three types of linear encoders for Linear Servomotors. The usage of the linear
encoder is specified in Pn002 = n.
Refer to the following manual for linear encoder models.
Σ-7-Series Linear Servomotor Product Manual (Manual No.: SIEP S800001 37)
• Parameter Settings When Using an Incremental Linear Encoder
Parameter

n. 0
(default setting)
Pn002

n. 1
• Parameter Settings When Using an Absolute Linear Encoder
Parameter

n. 0
(default setting)
Pn002

n. 1
5.25.1

Connecting an Absolute Linear Encoder

You can get the position data from the absolute linear encoder with MECHATROLINK commu-
nications.
Refer to the following section for information on connecting absolute linear encoders.
3.4.3 Wiring the SERVOPACK to the Encoder on page 3-14
5.25.2 Structure of the Position Data of the Absolute Linear
Encoder
The position data of the absolute linear encoder is the distance (number of pulses) from the ori-
gin of the absolute linear encoder.
The position data is signed 36-bit data.
5
±
Upper 16 bit (with ign)
When the SERVOPACK sends the position data, it sends the upper 16-bit data (with sign) sep-
arately from the lower 20-bit data.
5.25.3 Reading the Position Data from the Absolute Linear
Encoder
To read the position data from the absolute linear encoder, turn the power supply OFF and ON
again.

X

Use the encoder as an incremental linear encoder.

Use the encoder as an incremental linear encoder.

Use the encoder as an absolute linear encoder.

Use the encoder as an incremental linear encoder.

5.25.1 Connecting an Absolute Linear Encoder


.
Meaning
Meaning
20 19

5.25 Absolute Linear Encoders

When
Classification
Enabled
After restart Setup
When
Classification
Enabled
After restart Setup
Lower 20 bit
5
0
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