Siemens Simatic S7-300 - Page 115

Basic functions
4.2 Homing
Connection of the SINAMICS S120 to the Technology CPU
Product Information, 09/2011, A5E00480378-04
115
Hardware configuration
A typical application example is an encoder without zero mark evaluation. An external zero
mark (Bero) is used in place of the encoder zero mark. To ensure short response times, it is
read indirectly via the digital inputs of the CU320. The same signal is also evaluated via an
integrated input on the Technology CPU.
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CU320
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Double
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Allocating the zero mark substitute signal to the digital input of the SINAMICS and inverting the
selected digital inputs of the SINAMICS
Assign the digital input of SINAMICS as a zero mark substitute signal as described in
Section 4.2.3 Example of active homing with external zero mark only.
If necessary, invert the input that was used to detect the zero mark substitute signal as
described in section 4.2.3 Example of active homing with external zero mark only.