● Safe output signal
● No stop response
Note
Unexpected response of STOP F for SSM
A STOP F is indicated by safety message 201711. STOP F only results in the subsequent
response STOP B / STOP A if one of the safety functions is active. If only the SSM function
without hysteresis (that is, p9501.16 = 0) is active, a STOP F cross-checking error does not
result in a STOP B / STOP A follow-up response.
● The monitoring function is considered to be active as soon as "SSM with hysteresis" is
activated.
How does SSMfunction in detail?
Requirements
The safety function SSM cannot be selected or deselected using external control signals. SSM
is active if, for the drive involved, the following settings have been made:
● Extended Functions are selected as safety function scope.
● The velocity limit for SSM is parameterized > 0.
Evaluating the speed
The converter compares the load speed with the speed limit and signals if the limit value is
undershot to the high-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.
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Safety functions integrated in the drive
4.11 SSM
Safety Integrated (with SINAMICS S120)
148 Commissioning Manual, 02/2020, A5E46305916B AB
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