Overview - Omron CJ1W-NC271 - 12-2009 Operation Manual

Overview

8-1 Overview
292
When performing positioning for a system in terms of absolute positions in
that system, it is first necessary to define the origin. For example, in the X-Y
plane shown below, before positioning to (X, Y) = (100 mm, 200 mm), the ori-
gin (0,0) of the machine must be established, i.e., it is necessary to define the
origin.
Y axis
•(100, 200)
(0, 0)
With the PCU, the mechanical origin can be defined using any of the following
three methods.
Name
ORIGIN SEARCH The origin is determined by actually operating the Servomotor
and using the limit input signal, origin proximity input signal,
and origin input signal.
A photoelectric sensor or the phase Z signal from an encoder
can be used as the origin input signal.
Execute this function when using an incremental encoder Ser-
vomotor or Servomotor with absolute encoder used as an
incremental encoder.
PRESENT POSI- The origin can be determined by forcibly setting the position at
TION PRESET which the Servomotor is stopped to a user-specified position.
ABSOLUTE By using a Servomotor with absolute encoder, the absolute
ENCODER ORIGIN value data saved in the encoder can be read and the mechan-
ical origin can be established when starting to use the device.
The PCU also features a positioning function to return to the established ori-
gin.
Name
ORIGIN RETURN Positioning is performed from the position where the Servo-
motor is stopped to the origin that has been established using
ORIGIN SEARCH or PRESENT POSITION PRESET.
The PCU can also be operated without defining the origin but the axis opera-
tion for each function is as follows:
Function
JOG
ORIGIN RETURN
X axis
Contents
Contents
Can be executed.
Cannot be executed.
If executed, a Present Position Unknown Error
(axis error code: 3030 hex) will occur.
Section 8-1
Operation