Example: Active Homing Using Only An Encoder Zero Mark - Siemens SIMATIC S7-300 Product Information

4. In the "Ext. zero mark input" box, enter the address of the integrated inputs of the
5. Enter meaningful values in the "Approach velocity", "Entry velocity",
This completes the configuration 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.
4.2.5

Example: Active homing using only an encoder zero mark

Introduction
The simplest form of homing is the homing only with encoder zero mark. It is used,
for example, for axes whose encoder has only one zero mark in the complete travel area of
the axis. This homing command causes the axis to travel to the zero mark. Once the axis
detects the zero mark, the home position offset is applied at homing entry velocity.
The axis position now has the value specified in the home position coordinate.
Operational sequence
No BERO signal is required. The position is accepted at the next zero mark of the encoder.
Connection of the SINAMICS S120 to the Technology CPU
Product Information, 09/2011, A5E00480378-04
Technology CPU from HW Config, for example PI66.0.
and "Reduced velocity" input boxes.
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. In the dialog box for the "Homing" function, select the
"Data transfer from the drive" button to preassign the input fields with the data set for
SINAMICS. If you then change the settings, the necessary settings in SINAMICS will be
displayed in an information box.
Basic functions
4.2 Homing
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