Siemens SINAMICS S110 - Page 143

CU305 Control Units
7.3 Interface description
SINAMICS S110
Manual, 07/2015, 6SL3097-4AC10-0BP5
143
Table 7- 12 Maximum encoder cable length
Encoder type
Maximum encoder cable length in m
TTL
1)
100
HTL unipolar
2)
100
HTL bipolar
300
1)
100 m with remote sense
2)
Because the physical transmission media 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.
Connection example 1: HTL encoder, bipolar, with reference signal
Figure 7-4 Connection example 1: HTL encoder, bipolar, with reference signal
Signal cables must be twisted in pairs in order to improve noise immunity against induced
noise.
Connection example 2: HTL encoder, unipolar, with reference signal
Figure 7-5 Connection example 2: HTL encoder, unipolar, with reference signal
1)
1)
Because the physical transmission media 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.