Siemens SINAMICS S120 Function Manual page 124

Description of Safety Integrated functions
4.2 Safety Integrated Extended Functions
The function is activated automatically as soon as the Safety Integrated Extended Functions
are enabled with parameter p9501.0 = 1 and p9546 > 0. The SSM function is deactivated
with setting p9546 = 0.
Note
Relationship between SSM and SAM
If you enter "0" for p9568 (SAM shutdown threshold), the speed limit of the SSM function
(p9546) is simultaneously the lower limit for the Safe Acceleration Monitor function (SAM).
In this case, the effects of safe acceleration monitoring are therefore restricted if a relatively
high SSM velocity limit is set when using the SS1 and SS2 stop functions.
Note
Danger due to unwanted behavior of the STOP F on SSM
A STOP F is indicated by safety message C01711. STOP F only results in the subsequent
response STOP B / STOP A if one of the Safety Integrated 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.
• SSM is only valid as an active monitoring function if "Hysteresis and filtering" is
parameterized (p9501.16 = 1).
Note
Parameterization of hysteresis and actual value synchronization
You must carefully observe the following rules when parameterizing hysteresis and actual
value synchronization:
• If "SSM hysteresis" has been enabled (p9501.16 = 1), you must set parameters p9546
and p9547 according to this rule:
p9547 ≤ 0.75 · p9546
• If "Actual value synchronization" has been enabled (p9501.3 = 1), you must also observe
this rule:
p9549 ≤ p9547
Features
● Safe monitoring of the speed limit specified in p9546
● Parameterizable hysteresis via p9547
● Variable PT1 filter via p9545
● Safe output signal
● No stop response
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Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated