Siemens SINAMICS DCM Manual page 211

Additional system components
7.2 Sensor Module Cabinet-Mounted SMC30
SSI encoders
Figure 7-9
Encoders with 5 V supply connected to X521/X531
For encoders with a 5 V supply at X521/X531, the cable length depends on the encoder
current (for 0.5 mm
Figure 7-10
212
Maximum cable lengths depending on the SSI baud rate for SSI encoders
cable cross-sections):
2
Max. cable length as a function of the encoder current drawn
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SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001