Siemens SIMATIC S7-1500 Function Manual page 51

Motion sequence
The motion occurs in the following sequence:
1. Enablement of passive homing via the Motion Control instruction "MC_Home".
2. Motion due to a Motion Control job from the application
3. Detection of the proximity switch
4. Departure from the proximity switch
5. Detection of the homing mark
S7-1500 Motion Control V13 Update 3
Function Manual, 07/2014, A5E03879256-AC
The detection of the proximity switch and of the homing mark is enabled when the actual
position value of the axis or encoder moves in the assigned homing direction.
The departure from the proximity switch enables the detection of the homing mark.
When the homing mark is detected, the position of the axis or encoder is set depending
on the configured mode:
– Parameter "Mode" to "MC_Home" = 2, 8
Position = value in parameter "Position"
– Parameter "Mode" to "MC_Home" = 10
Position = value in tag <TO>.Homing.HomePosition
Note
Parameter "MC_Home.Mode"
The "MC_Home.Mode" parameter for S7-1200 Motion Control and S7-1500 Motion
Control has been standardized within the framework of technology version V2.0. This
results in a new assignment of the parameter values for the "MC_Home.Mode"
parameter. A comparison of the "MC_Home.Mode" parameter for technology versions
V1.0 and V2.0 is available in the section Version overview (Page 86).
Note
If the direction of motion changes after departure from the proximity switch and before
detection of the homing mark, then the proximity switch must be detected again. The
Motion Control instruction "MC_Home" remains enabled.
Basics
3.14 Homing
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