Absolute Encoder Setup - Omron CJ1W-NC271 - 12-2009 Operation Manual

Absolute Encoder Origin
8-6-4

Absolute Encoder Setup

Note
Name
Feedback present posi-
tion
Command present posi-
tion
b = Beginning word of Axis Operating Input Areas specified in Common
Parameters + (Axis No. −1) × 25
The absolute encoder setup must be performed when using the absolute
encoder for the first time, initializing the rotation amount to 0, or having left the
absolute encoder for a long time without connecting a battery.
The following methods can be used to set up the absolute encoder when
using a Position Control Unit with unit version 1.2 or later.
• The absolute encoder can be set up using the CX-Motion-NCF.
• The absolute encoder can be set up from the user program using a func-
tion block from the OMRON FB Library.
• The absolute encoder can be set up using the Servo Drive's Setting Tool.
Refer to the SYSMAC CX-Motion-NCF Programmable Controller Operation
Manual (Cat. No. W436) for information on setting up the absolute encoder
from the CX-Motion-NCF.
When setting up an absolute encoder using the function block from the
OMRON FB Library, use a CPU Unit with unit version 3.0 or later.
Absolute Encoder Setup Function Block in OMRON FB Library:
_NCF700_InitializeAbsEncoder
Start Bit
Busy Flag
Unit No.
Axis No.
The absolute encoder setup can be executed by specifying the unit number
and axis number for the function block, and setting the Start Bit.
For information on function block operating requirements and precautions,
refer to the OMRON FB Library Reference Manual (Cat. No. W442).
When using a PCU with unit version 1.1 or earlier, absolute encoder setup is
executed using the Servo Drive's Setting Tool. For details on absolute
encoder setup operations using the Servo Drive Setting Tool, refer to the
operation manual for the connected Servo Drive.
After executing absolute encoder setup, be sure to turn ON the Servo Drive's
control power supply again. Not doing so will prevent the Servo Drive's
response to PCU commands, and normal operation will not be possible.
Word Bits
b+6 --- Present position:
b+7 Feedback present position (rightmost
word)
Feedback present position (leftmost
word)
b+8 --- Present position:
b+9 Command position (rightmost word)
Command position (leftmost word)
_NCF700_InitializeAbsEncoder
(BOOL) (BOOL)
EN
(INT) (BOOL)
UnitNo
(INT) (BOOL)
Axis
(BOOL)
(WORD)
ErrorID
Section 8-6
Contents
ENO
Busy
Busy Flag
Setup completed
Done
Error Flag
Error
Error Code
(Can be omitted)
331