Siemens S120 Manual page 267

Encoder cables
Encoder type
TTL
HTL unipolar
HTL bipolar
SSI
1)
2)
3)
Note
Prefabricated cable for 5 V TTL encoder
When using a 5 V TTL encoder (6FX encoder), use connection cable 6FX8002-2CR00-xxx.
Figure 7-4
AC Drive
Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
1)
2)
3)
100 m with remote sense
Because the transmission technology is more robust, the bipolar connection should always be
used. The unipolar connection should only be used if the encoder type does not output push-pull
signals.
For the cable length, see the diagram "Maximum cable lengths depending on the SSI baud rate for
SSI encoders"
Maximum cable lengths depending on the SSI baud rate for SSI encoders
Control Units, Control Unit Adapters and operating components
7.3 Control Unit CU310-2 PN (PROFINET)
Maximum encoder cable length in m
100
100
300
up to 100 (depending on the baud rate)
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