Siemens SINAMICS S120 Equipment Manual page 345

For encoders with a 5 V supply at X521/X531, the cable length is dependent on the encoder
current (this applies to cable cross-sections of 0.5 mm²):
Figure 8-13 Signal cable length as a function of the encoder current consumption
S120 Cabinet Modules Equipment Manual
Manual, (GH5), 10/2008, A5E00427098A
8.8 K50, SMC30 Sensor Module Cabinet-Mounted for TTL, HTL, and SSI encoders
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