Siemens Sinamics s120 Commissioning Manual page 275

Types of encoder that can be connected
Encoder Incremental tracks
evaluation
using the module
SMC20 sin/cos, 1 Vpp
SME25 sin/cos, 1 Vpp
SMC30 Square or
no incremental
tracks
SME125 sin/cos, 1 Vpp
"not cyclic" means that the absolute position is only read when initializing the Sensor Module, after which the position is
1)
only calculated by the incremental tracks.
"cyclic" means that the absolute position is read permanently (usually in the PROFIBUS or position controller cycle) and
2)
the position (X_IST1) formed from this.
The SSI protocol is cyclically read-out for the plausibility checks.
3)
Note
Only encoders that support a transfer rate of 100 kHz and that have a high level in idle state
may be used.
The monoflop time should be parameterized such that it is greater than or equal to the
specified monoflop time of the encoder. This must lie in the range between 15 – 30 µs.
The level during the monoflop time must be low.
STARTER Commissioning Manual
Commissioning Manual, (IH1), 07/2016, 6SL3097-4AF00-0BP5
Absolute position
SSI not cyclic
1)
SSI not cyclic
1)
SSI not cyclic
1), 3)
SSI, cyclic
2)
SSI not cyclic
1)
3.19 Commissioning of SSI encoders
Voltage supply for SSI baud rate
encoder
5 V 100 kBaud
5 V 100 kBaud
5 V or 24 V 100-
250 kBaud
5 V 100 kBaud
Commissioning
Remarks
-
SME25 is only
suited to direct
measuring
systems
-
SME125 is only
suited to direct
measuring sys-
tems
275