For Homing Operation Mode 11, the MC Function Module detects when the limit signal turns OFF
to define home. It dif
fers from a Homing Operation Mode that uses the home input as an external
latch signal in the following ways.
Make sure that you understand these differences with other Homing Operation Modes before you
use Homing Operation Mode 11.
• The MC Function Module detects the limit input without an external latch function, such as one
provided by a Servo Drive. MC Function Module processing is the processing performed at the
primary period interval. Therefore, the precision of the home definition will depend on the hom-
ing approach velocity and the control period of the primary periodic task.
• The axis does not return to the home position. If the homing compensation value is 0, process-
ing for homing will end with the axis at a different position (i.e., not at home).
• Homing compensation is not performed if the homing compensation value is set to 0. If the
homing compensation value is 0, processing for homing ends with the axis at a different position
(i.e., not at home), as explained above. If the homing compensation value is not 0, then homing
compensation is performed with the homing compensation value as a relative position from
home in the same way as for other homing operation modes.
• The home offset is used to change the position of home. If the stop position is offset from home
by distance D, as shown in the following figure, the position after the completion of processing
for homing will be L + D if the home offset is L and the homing compensation value is 0.
D
0
D
L L + D
Range of stopping for remaining pulses
Before home offset:
After home offset:
Range where negative
limit signal is ON
Precautions for Correct Use
• After the OFF limit signal is detected, the limit signal in the opposite direction from the home
input detection direction is ignored while stopping for the remaining pulses until homing com-
pensation is started.
• If the homing compensation value is 0 and the limit input signal in the home input detection
direction turns ON immediately after home is defined, set a homing compensation value to
return past the limit signal input position.
Application Example for Homing Operation Mode 11
If, as shown below, there is not sufficient space to install both a negative limit signal and home
signal, you can use the negative limit signal to perform the functions of both the limit signal and
home signal.
3 Axis Command Instructions
3-30
NY-series Motion Control Instructions Reference Manual (W561)
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