Safe Actual Value Acquisition - Siemens Sinamics S110 Function Manual

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Safety Integrated Functions
8.5 Extended Functions
8.5.9

Safe actual value acquisition

Supported encoder systems
Safety functions used to monitor movements (e.g. SS2, SOS, SLS and SSM) require safe
actual value aquisition.
For safe speed/position sensing for SINAMICS S110, only a single-encoder system may be
used.
Single-encoder system
Encoders within single-encoder systems are used to generate the failsafe actual values of
the drive. This motor encoder must be appropriately qualified (see encoder types). The
safety-relevant actual values are generated either directly in the encoder or in the Sensor
Module and are transferred to the Control Unit by way of failsafe communication via DRIVE-
CLiQ.
For motors without a DRIVE-CLiQ interface, the connection is established by means of
additional Sensor Modules (SMC or SME).
NOTICE
When specifying the standstill tolerance window, observe that failsafe position monitoring
within a single-encoder system only works at a rough resolution with 4 pulses per
revolution.
Figure 8-10
326
Example of a single-encoder system
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
Drive functions

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