292
Overview
Section 8-1
8-1
Overview
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.
With the PCU, the mechanical origin can be defined using any of the following
three methods.
The PCU also features a positioning function to return to the established ori-
gin.
The PCU can also be operated without defining the origin but the axis opera-
tion for each function is as follows:
Name
Contents
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-
TION PRESET
The origin can be determined by forcibly setting the position at
which the Servomotor is stopped to a user-specified position.
ABSOLUTE
ENCODER ORIGIN
By using a Servomotor with absolute encoder, the absolute
value data saved in the encoder can be read and the mechan-
ical origin can be established when starting to use the device.
Name
Contents
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.
Function
Operation
JOG
Can be executed.
ORIGIN RETURN
Cannot be executed.
If executed, a Present Position Unknown Error
(axis error code: 3030 hex) will occur.
Y axis
X axis
•
(100, 200)
(0, 0)
Summary of Contents for CJ1W-NC271 - 12-2009
Page 2: ......
Page 4: ...iv ...
Page 6: ...vi ...
Page 22: ...xxii ...
Page 58: ...30 Starting Operation Section 2 2 ...
Page 244: ...216 Axis Operating Input Memory Areas Section 4 8 ...
Page 264: ...236 Transferring Servo Parameters Section 5 3 ...
Page 396: ...368 Linear Interpolation Section 9 7 ...
Page 648: ...620 List of Error Codes Appendix D ...
Page 674: ...646 Additional Functions for the CJ1W NCF71 MA Appendix F ...
Page 684: ...656 Index ...
Page 686: ...658 Revision History ...