Homing Mode - Siemens SIMATIC S7-1500 Function Manual

Home position offset
The difference between the homing mark position and the home position is the home
position offset.
An offset between homing mark position and home position only has an effect during active
homing. The offset is traversed after the synchronization of the axis via the Motion Control
instruction "MC_Home". For axes with the modulo setting, the home position offset is always
traversed using the direction setting for the shortest path.
Direction reversal at the hardware limit switch (reversing cam)
Hardware limit switches can be used as reversing cams in active homing. If the homing mark
is not detected or was approached from the wrong side, then the motion continues after the
reversing cam in the opposite direction.
3.14.3

Homing mode

Various homing modes are available for the positioning axis/synchronous axis and external
encoder technology objects with incremental encoders. The homing mode is set in the
configuration.
Homing with zero mark via PROFIdrive frame and proximity switch
The system checks for when the proximity switch is reached. After the proximity switch is
reached and is left again in the assigned homing direction, zero mark detection is enabled
via the PROFIdrive message frame.
When the zero mark is reached in the pre-selected direction, then the actual position of the
technology object is set to the homing mark position.
Homing with zero mark via PROFIdrive frame
The system enables zero mark detection, as soon as the actual value of the technology
object moves in the assigned homing direction.
When the zero mark is reached in the specified homing direction, the actual position of the
technology object is set to the homing mark position.
S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC
Basics
3.14 Homing
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