Siemens SINAMICS S120 Function Manual page 172

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
Gearbox switchover with increased position tolerance
In order to switch over the gearbox stage, where increased tolerance is required for the
crosswise comparison of the actual positions, proceed as follows:
Note
Maximum duration of the increased position tolerance
It is not permissible that the increased position tolerance is set for longer than 2 min. If this
time is exceeded, the converter outputs message C01711 with fault value 1015 (≙ STOP F).
1. Set the increased position tolerance using bit 3 (= 1) in byte 3 of S_STW2.
2. Set the new gearbox stage using bits 0 to 2 in byte 3 of S_STW2.
3. Set the position tolerance back to the normal value using bit 3 (= 0) in byte 3 of S_STW2.
4. The actual values are then synchronized once automatically. This synchronization is used
to compensate any possible difference that occurs between the position actual values of
the two monitoring channels as a result of the switchover operation.
The new gearbox stage is then active.
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Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated