Siemens SINAMICS S120 Combi Manual page 246

Encoder system connection
10.2 Sensor Module Cabinet-Mounted SMC30
Maximum encoder cable lengths
Note
The maximum cable lengths according to the following table must not be exceeded even
when longer cable lengths can be calculated.
Table 10- 14 Maximum encoder cable length
Encoder type
TTL
HTL unipolar
HTL bipolar
SSI
For TTL encoders at X520 → remote sense → 100 m
1)
Because the physical transmission media is more robust, the bipolar connection should always be
2)
used. The unipolar connection should only be used if the encoder type does not output push-pull
signals.
See the diagram "Maximum cable length depending on the SSI baud rate for SSI encoders"
3)
SSI encoder
Figure 10-9
246
1)
2)
Maximum cable length depending on the SSI baud rate for SSI encoders
Maximum encoder cable length in m
100
100
300
100
3)
SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7