Siemens SINUMERIK Series Function Manual page 41

Note
SSM is a pure signaling function.
Contrary to other Safety Integrated functions, a violation of the SSM limit does not result in a
drive-based stop response.
Example of how the function can be used
● A protective door may only be opened if all of the drives are at a complete standstill.
How does SSM function in detail?
Preconditions:
● The safety function SSM cannot be selected or deselected using external control signals.
● SSM is active, if you have set a monitoring speed > 0 for SSM .
Evaluating the speed
The inverter compares the load speed with the speed limit and signals if the limit value falls
below the higher-level control.
Parameterizable hysteresis
The parameterizable hysteresis ensures that the SSM output signal does not jump between
the values "0" and "1" in the limit range.
Safety Integrated
Function Manual, 10/2015, 6FC5397-3EP40-5BA3
Overview of Safety Integrated functions
2.3 Safety Integrated Extended Functions
41