Siemens SINAMICS S120 Commissioning Manual page 251

Cyclic acknowledgment
Acknowledgment using the encoder interface (Gn_STW.15)
The following responses are possible:
● The encoder is set to fault-free if faults are no longer active. The fault bit in the encoder
● If the fault is still present, or if other faults are present, the acknowledgment is not
● The drive object is not detected via the encoder interface. Faults set in the drive object
Acknowledgment using the drive interface (STW1.7 (cyclic) or p3981(acyclic))
The following responses are possible:
● If no more errors are present, the encoder is set to fault free and the fault bit in the drive
● If the fault is still present, or other faults are present, then the acknowledgment is not
● The RDY LED on the evaluation modules is continuously red.
● The encoder interfaces of the assigned encoders are NOT reset by acknowledgement at
● The encoder interfaces must also be acknowledged via the corresponding encoder
Commissioning Manual
Commissioning Manual, (IH1), 01/2012, 6SL3097-4AF00-0BP2
interface is acknowledged. The evaluation modules indicate RDY LED = green after
acknowledgment.
This behavior is valid for all encoders connected via the encoder interface, irrespective of
the measuring system type (via motor or direct).
successful - and the highest priority fault (can be the same or another fault entry) is
transferred via the encoder interface.
The RDY LED on the evaluation modules is continuously red.
This behavior is valid for all encoders connected via the encoder interface, irrespective of
the measuring system type (motor or direct).
remain, the drive does not even start with the encoder which in the meantime is fault-free.
The drive object must also be acknowledged via the drive interface (fault memory
RESET).
Note
The possibility to acknowledge directly via the encoder interface is especially important in
the event that "free encoder assignment" is used.
If an encoder on the drive side is assigned a certain drive X, but on the NC side a
completely different axis Y, then for this parameterized coupling, a fault cannot be
completely reset – i.e. acknowledged – using a fault memory reset (acknowledge drive).
Drive X, which is waiting for a fault memory reset, does not receive one from the NC. On
the other hand, drive Y receives a fault memory reset, but cannot execute this.
interface is acknowledged. The evaluation modules indicate RDY LED = green.
Acknowledgment takes place on all encoders that are logically assigned to the drive.
successful; the next, highest priority fault is transferred via the drive interface and also via
the encoder interface involved.
the drive interface; the set faults remain.
control word Gn_STW.15.
Diagnostics
3.6 Troubleshooting for encoders
249