Siemens Sinamics S120 Function Manual page 151

In systems with encoders with SINAMICS Safety Integrated (single and 2-encoder systems),
the following encoders are permitted for safe actual value acquisition:
● Encoders with sin/cos 1 Vpp signals
– Single and 2-encoder systems
– Connected to the SINAMICS SME20/25, SME120/125 and SMC20 Sensor Modules
– The encoders must contain purely analog signal processing and creation. This is
● HTL/TTL encoders
– Can only be used for 2-encoder systems. In this case, one encoder must be an
– Connected to an SMC30 Sensor Module Cabinet or to the onboard interface of the C
– An HTL/TTL encoder connected to the onboard interface of CU310-2, SINAMICS HLA
– Note the lowest possible velocity resolution (r9732[1]) for an HTL/TTL encoder
Not e
E nc oders with integrated DRIVE-CLiQ interface
These encoders must be certified at least according to IEC 61800-5-2 (SIL2) or ISO 13849-1
(Performance Level d / Category 3).
A fault mode effect analysis (FMEA) for securing the encoder on the motor shaft or on the
linear drive must be performed. The result must be that the risk of the encoder mounting
loosening is defined as a fault that can be ruled out (see DIN EN 61800-5-2, 2008, Table
D.16). The encoder would no longer correctly map the motion if its mounting were to become
loose.
It should be noted that the machine manufacturer has sole responsibility for the fulfillment of
the above-described requirements. Information on the internal realization of the encoder
must come from the encoder manufacturer. The FMEA must be created by the machine
manufacturer.
Siemens motors with and without DRIVE-CLiQ connection, which can be used for Safety
Integrated functions, are listed under:
http://support.automation.siemens.com/WW/view/en/33512621
For these motors, the encoder mounting on the motor shaft can be considered to be safety
relevant, and faults associated with an encoder becoming loose ruled out.
Safety Integrated
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
necessary to be able to prevent the A/B track signals with valid levels from becoming
static ("freezing").
HTL/TTL encoder. The other encoder can be a sin/cos encoder or an HTL/TTL
encoder.
U310-2, SINAMICS HLA or SINAMICS S120 Combi.
or SINAMICS S120 Combi must not be operated as first encoder.
system.
Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
151