Example For Active Homing With One Of The External Zero Marks Mirrored On The T-Cpu - Siemens SIMATIC S7-300 Product Information

Basic functions
4.2 Homing
3. Enter appropriate values in the "Approach velocity", "Entry velocity", and
Note
Note that only negative edges are permitted for the positive travel direction, and only
positive edges are permitted for the negative travel direction, which means that the same
cam side is always used.
This completes the configuring of the technological part of the homing function in
S7T Config.
Creating the S7 user program
Use the Technology Object Manager (TOM) to create a technology data block (TO-DB),
which is assigned to the homing output cam technology object. The technology data block
(TO-DB) allows the functions on the associated technology object to be executed using the
provided FBs. For the homing, use the FB403 MC_Home function block in your S7 program.
4.2.4 Example for active homing with one of the external zero marks mirrored
on the T-CPU.
Introduction
An external zero mark (Bero) should be used for homing the axis. It is therefore necessary to
use one of the fast integrated digital inputs of the SINAMICS S120. In addition to the
example of active homing with external zero mark only, the zero mark signal is also read into
the Technology CPU.
Operational sequence
The position is accepted when one of the defined BERO edges is passed. In contrast to
active homing with external zero mark only, the Technology CPU also evaluates the status of
the BERO (assigned / unassigned). This allows the direction to be reversed can during
homing in addition to the selected homing settings.
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"Reduced velocity" input boxes.
Connection of the SINAMICS S120 to the Technology CPU
Product Information, 09/2011, A5E00480378-04