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8. Operating modes
Festo P.BE-CMMP-CO-SW-EN 0708NH
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Methods 7 and 11: Homing switch and zero impulse evaluation
These two methods use the homing switch that is active over only a part of the section.
These homing methods are especially useful for round-axis applications, where the
homing switch is activated once per revolution.
With method 7, the drive first moves in a positive direction and with method 11 in a
negative direction. Depending on the direction of travel, the zero position refers to the
first zero pulse in the negative or positive direction from the homing switch. This can be
seen in the two following depictions.
Fig. 8.5: Homing run to the homing switch with evaluation of the zero pulse with positive
initial movement
For homing runs to the homing switch, the limit switches first serve
to reverse the search direction. If the opposite limit switch is then
reached, an error is triggered.
Fig. 8.6: Homing run to the homing switch with evaluation of the zero pulse with negative
initial movement
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