Siemens SINAMICS S120 Function Manual page 164

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
Actual value synchronization
1)
Figure 4-25
The mean value of the actual values of both channels is calculated cyclically after actual
value synchronization (p9501.3 = 1) has been activated, for example, for systems or
machines with slip. The maximum slip defined in p9549 is monitored in the cross-check cycle
(r9724). The maximum slip defined in p9549 is monitored once per cross-check cycle
(r9724).
If "Actual value synchronization" is not enabled, the value parameterized in p9542 is used as
tolerance value for the cross-checking.
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This deviation cannot be larger than the position difference that can arise at maximum slip
(p9549) during a cross-check cycle (r9724).
Example diagram of actual value synchronization
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated