Siemens Sinamics S120 Function Manual page 495

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Ex ample trace: SSM (without encoder) with hysteresis

Drive_1.r9714[0]: SI motion diagnostics velocity, load-side velocity actual value at the Control Unit

SSM (speed below limit value)

Example trace: SSM (without encoder) with hysteresis

Trace evaluation:

● Drive is accelerated (time axis from approx. -150 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. 470 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. 670 ms)

Time differences through internal c alculations

Small time differences (of the order of two to three Safety cycles (here, approx. 7 ms)) are

caused by internal calculations and do not present a problem.

Safety Integrated

Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6

A.3 Acceptance tests (recommendations)

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