Siemens Sinamics S120 Function Manual page 454

Appendix
A.3 Acceptance tests (recommendations)
Ex ample trace: SSM (with encoder) with hysteresis
①
Drive_1.r9714[0]: SI motion diagnostics velocity, load-side velocity actual value at the Control Unit
②
SSM (speed below limit value)
Image A-10 Example trace: SSM (with encoder) with hysteresis
Trace evaluation:
● Drive is accelerated (time axis from approx. -300 ms)
● SSM limit value (p9546) 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 mentioned bit is only set to 1 again if the speed falls below
the SSM limit value minus the hysteresis value (p9547) (time axis approx. 1080 ms)
Not e
Time differences through internal c alculations
Small time differences (of the order of two to three safety cycles (here up to 36 ms)) are
caused by internal calculations and do not present a problem.
454
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Safety Integrated