Siemens SINAMICS DCM Manual page 203

Additional system components
7.2 Sensor Module Cabinet-Mounted SMC30
Connection example 2: HTL encoder, unipolar, with reference signal
Figure 7-4
Because the physical transmission properties are more robust, the bipolar connection
1)
should always be used. The unipolar connection should only be used if the encoder type
does not output push-pull signals.
204
Connection example 2: HTL encoder, unipolar, with reference signal
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SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001
1)