6-1
Section
Outline
128
6-1
Outline
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), it necessary to
establish where the origin is, i.e., it is necessary to determine the origin.
Y axis
X axis
With the PCU, the origin can be defined in the two ways given below.
Name
Description
ORIGIN SEARCH
Using this method, the motor controlling
movement is actually operated and the origin is
determined using limit input signals, an origin
proximity input signal, and an origin input signal. A
photoelectric sensor or the Z-phase signal from an
encoder can be used as the origin input signal.
PRESENT POSITION
PRESET
The origin can be determined by forcibly setting
the position at which the motor is stopped to the
desired value.
In addition, the PCU also features the following origin reset function, which can
be used to reset the position to the origin set with the above methods.
Name
Description
ORIGIN RETURN
With the motor stopped, the position is reset to the
origin set by the origin search or present position
preset functions.
The motor can be operated without determining the origin (although origin return
cannot be used). Operation will, however, proceed in the way described below.
Summary of Contents for CS1W-NC113 - REV 02-2008
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