Omron CS1W-MCH71 Operation Manual page 578

Overview
8-1-2 Using Absolute Encoders
Absolute Encoder Setup
1,2,3...
Word Variable
x+0 IW0440
- -
x+31 IW045F
x+0 IW0440
- -
x+31 IW045F
With the ABS encoder, the present position can be defined by reading the
absolute value from the encoder when the MC Unit is turned ON if the PLC
(MC Unit) or servo driver was turned OFF once. Because of this, there is no
need to perform origin searches every time when turning ON the devices. This
section explains the set up procedure briefly.
For details, see 8-5 Absolute (ABS) Encoders (page 539).
Absolute encoder data must be reset and the absolute origin for the MC Unit
must be set in the following cases:
• When a Servomotor with an absolute encoder is connected for the first
time or replaced
• When the battery is replaced.
• When the held absolute data is lost because the encoder cable has been
plugged OFF for a long time.
Use the following procedure to set up the absolute encoder:
1. Connect the motor to the machine.
2. Referring to the Servo Driver operation manual, replace the battery.
3. Referring to the Servo Driver operation manual, held values are cleared
(data reset). At this point, the origin of the absolute encoder and the ma-
chine origin do not match with each other.
4. Execute Servo Lock using the MC Unit.
5. Perform an origin search to move the Servomotor axis to the origin.
6. Turn the absolute encoder OFF and ON in order to save the present value
as the origin. The absolute encoder value indicating the machine origin is
stored as absolute an origin setting value.
Once the setup is completed, since the present value is decided by automati-
cally subtracting the ABS origin setting value from the value read from the
encoder when the power is turned ON, no origin search will be required. For
details, see 8-6 ABS Encoder Origin Setting (page 540).
Bit Name
09 ABS Origin Setting (Axis 1)
-
ABS Origin Setting (Axis 32)
06 Origin Search (Axis 1)
-
Origin Search (Axis 32)
See 7-4 Interface Specifics (page 420) for details on each bit.
Description
0: Nil
1: Nil
?: Sets ABS encoder origin
?: Nil
0: Nil
1: Continues origin search
↑: Starts origin search
↓: Stops origin search
Section 8-1
533