Examples and tips
PROGRAMMING MANUAL 255
Revision 3.0
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.
fig. 27
The figure shows the possible scenarios for absolute origin search
plus limit switches. These scenarios depend on the position of the
moving part when the power comes on.
The program example that does this origin search sequence is
given below.
'Absolute origin switch: IN0
'Left limit switch: IN1
'Right limit switch: IN2
BASE(0)
DATUM_IN=0
FW_IN=2
RV_IN=1
SERVO=ON
WDOG=ON
DATUM(4)
WA(1)
WAIT UNTIL MTYPE=0 OR IN(1)=OFF
IF IN(1)=ON
FORWARD
WAIT UNTIL IN(0)=ON
WAIT UNTIL IN(0)=OFF
CANCEL
DATUM(4)
ON OFFOFF
min. limit switch
origin limit switch
moving part
max. limit switch
ON OFF ONOFF
FORWARDREVERSE
min limit switch
origin limit switch
max limit switch
I52E-EN-03.book Seite 255 Freitag, 29. Juni 2007 11:55 11
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