Siemens SINAMICS S110 - Page 510

Safety Integrated Functions
8.9 Acceptance test and acceptance report
Function Manual
508 Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Example Trace SSM (with hysteresis)
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Figure 8-47 Example Trace SSM (with hysteresis)
Trace evaluation:
● Drive is accelerated (time axis from approx. -300 ms)
● SSM limit value (p9546/p9346) is exceeded (time axis 0 ms)
● Bit "SSM (speed below limit value)" is set to 0 (time axis 0 ms)
● Drive is decelerated again (time axis approx. 750 ms)
● Hysteresis active: The above named bit is only set to 1 once more if the speed falls below
the SSM limit value minus the hysteresis value (p9547/p9347) (time axis approx. 1080
ms)
Note
Small time differences (of the order of 2 to 3 Safety clock cycles (here up to 36 ms)) are
caused by internal calculations and do not present a problem.