Specifications

Examples and tips
PROGRAMMING MANUAL 248
Revision 5.0
fig. 25
The figure shows a general origin search scenario. This simple origin search
sequence has 3 steps:
1. Search for a signal.
2. Search for another signal.
3. Move the axis to a predefined position.
It is important to note that, before any homing procedure is executed, it is
necessary to set the axis parameters UNITS, REP_DIST and
REP_OPTION, and Servo Driver parameters Pn202, Pn203 and Pn205
properly and in accordance with the mechanical system and desired
measurement units used in programming. Those parameters have influence
to the origin search, especially if an absolute encoder is used. For more
information on setting these parameters, see section 5.1.2.
Absolute switch origin search plus limit switches
fig. 26
The origin search function is performed by searching for an external limit
switch that is positioned absolutely and the position of which defines the
origin position. The example for this homing procedure is shown in the
figure.
ONmin. limit switch
origin limit switch
moving part
max. limit switch
encoder
OFF
ON OFFOFF
ONOFF
Note
For safety reasons, limit switches are normally closed. For this
reason, in this figure and in the following figures in this section, the
low signal level is indicated as ON, and the high signal level is indi-
cated as OFF.
ON OFFOFF
min. limit switch
origin limit switch
moving part
max. limit switch
ON OFF ONOFF