Siemens SINAMICS S120 Function Manual page 162

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
Encoder types for single and 2-encoder systems
Incremental encoders or absolute encoders can be used for safe acquisition of the position
values on a drive.
The absolute position values can be transferred via the serial EnDat interface or an SSI
interface to the controller. However, these are not evaluated by the safety functions.
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
– 1 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, CUA32,
– Note the lowest possible velocity resolution (r9732[1]) for an HTL/TTL encoder
– When using 2 HTL/TTL encoders, these must be connected to separate power
● EnDat-2.2 encoder with SMC40
– 1 and 2-encoder systems
● DRIVE-CLiQ encoder
– 1 and 2-encoder systems
Note
Encoders 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 Failure Mode Effects 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.
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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, CUA32, SINAMICS HLA or SINAMICS S120 Combi.
SINAMICS HLA or SINAMICS S120 Combi must not be operated as first encoder.
system.
supplies.
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated