Homing; Homing Possibilities - Siemens SIMATIC S7-300 Product Information

Basic functions

4.2 Homing

4.2 Homing
4.2.1

Homing possibilities

Introduction
The "Homing" function is used to align the actual value of an encoder with the position of the
machine after the supply power is switched on or after the replacement of the encoder.
Where as incremental encoders must be homed after each restart of the system, absolute
encoders normally only need to be homed after a replacement of the encoder or the twisting
of the spindle without encoder.
The following homing possibilities exist:
● Active homing
● Passive homing
● Direct homing
Active homing
A special traversing motion is executed for this type of homing.
Any running active motion command will be cancelled.
The following homing modes can be set in S7T Config:
● Homing with reference cam and encoder zero mark
● Homing only with reference cam
● Homing only with encoder zero mark
● Correct position value
● Correct internal axis coordinate system
Passive homing
The homing does not cause any motion of the axis in this case.
Any running motion commands will not be affected.
The following homing possibilities exist:
● Homing with reference cam and encoder zero mark
● Homing only with reference cam
● Homing with only encoder zero mark.
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Connection of the SINAMICS S120 to the Technology CPU
Product Information, 09/2011, A5E00480378-04