Siemens SINAMICS S110 - Safe Speed Monitor (SSM); Safe Speed Monitor with Encoder

Safety Integrated Functions
8.5 Safety Integrated Extended Functions
Function Manual
382 Function Manual, 01/2011, 6SL3097-4AB10-0BP3
8.5.7 Safe Speed Monitor (SSM)
8.5.7.1 Safe Speed Monitor with encoder
General description
The "Safe Speed Monitor" (SSM) function provides a reliable method for detecting when a
speed limit has been undershot (p9346/p9546) in both directions of rotation, e.g. for zero
speed detection. A fail-safe output signal is available for further processing.
The function is activated automatically as soon as the Safety Integrated Extended Functions
are enabled with parameters p9301.0 = p9501.0 = 1 and p9346/p9546 > 0. SSM is
deactivated if p9346/p9546 = 0.
NOTICE
If 0 is entered for p9368/p9568, the speed limit of the SSM function (p9346/p9546) is
simultaneously the shutdown limit for the safe acceleration monitoring function (SAM).
In this case, the effects of safe acceleration monitoring are therefore restricted if a relatively
high SSM/SAM speed limit is set when using the SS1 and SS2 stop functions.
WARNING
A STOP F is indicated by Safety message C01711/C30711. STOP F only results in the
follow-up response STOP B / STOP A if one of the Safety functions is active. If only the
SSM function 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 p9301.0 = p9501.0 ≠ 0 and
p9346 = p9546 ≠ 0 and "Hysteresis and filtering" is parameterized
(p9301.16 = p9501.16 = 1).
If "Hysteresis and filtering" is not parameterized (p9301.16 = p9501.16 = 0), SSM is not
valid as an active monitoring function, but instead has only an informative character.