Safe Speed Monitor (Ssm); Safe Speed Monitor With Encoder - Siemens Sinamics S110 Function Manual

Safety Integrated Functions
8.5 Safety Integrated Extended Functions
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.
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.
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WARNING
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
Function Manual