Appendix
A.6 Overview of measuring systems / encoders
Commissioning with Startdrive
416 Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1
TTL/HTL incremental encoder
Description
These encoders operate analogously to the SIN/COS incremental encoders, although they
supply a different output level. They are also referred to as pulse or square-wave encoders.
● HTL (High Threshold Logic); encoders with HTL interfaces are designed for applications
with digital inputs with 24 V levels.
● RS 422 differential signals (TTL = Transistor Transistor Logic).
● The resolution can be improved by a factor of four for TTL and HTL encoders through
edge evaluation.
● TTL/HTL encoders are offered in the Startdrive with and without SSI protocol.
Note
Using the SSI protocol
Information on the SSI protocol can be found in Chapter "
SSI encoder (Page 423)".
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