Technical data

Safety Integrated Functions
8.5 Safety Integrated Extended Functions
Function Manual
386 Function Manual, 06/2012, 6SL3097-4AB10-0BP4
Features
● Safe monitoring of the speed limit specified in p9346 and p9546
● Parameterizable hysteresis via p9347 and p9547
● Variable PT1 filter via p9345 and p9545
● Safe output signal
● No stop response
8.5.7.1 Safe Speed Monitor with encoder
Functional features of "Safe Speed Monitor" with encoder
The parameter p9346/p9546 "SI Motion SSM (SGA n < nx) speed limit n_x" is used to set
the speed limit. The abbreviation "SGA n < nx" indicates the safety function required for
determining an output signal when a parameterizable velocity limit has been undershot.
If the speed limit for the "Safe Speed Monitor" feedback signal (n < n_x) is undershot, the
signal "Safe Speed Monitor feedback signal active" (SGA n < n_x) is set. When the set
threshold value has been undershot, the "Safe Acceleration Monitor" (SAM) function is also
deactivated (see p9368/p9568). If p9368 = p9568 = 0, then p9346/p9546 (SSM feedback
signal) is also used as a minimum threshold for the SAM monitoring.
The hysteresis for the SSM output signal is set in parameter p9347/p9547 "SI Motion SSM
Speed Hysteresis n_x". The SSM output signal can either take the state "1" or "0" –
depending on from which direction the belt is reached.
If the maximum permissible speed tolerance is exceeded (i.e. one channel displays a speed
less than p9546 - p9547, while the other channel displays a speed greater than p9546), a
STOP F is issued. Parameters p9347/p9547 are used to define the maximum tolerance of
the speed actual values between the two channels.
The output signal for SSM is smoothed by setting a filter time with a PT1 filter
(p9345/p9545).
During safe motion monitoring, the hysteresis and filtering functions can be activated or
deactivated jointly using the enable bit p9301.16/p9501.16. In the default setting, the
functions are deactivated (p9301.16/p9501.16 = 0).
NOTICE
Exception
If the "hysteresis and filtering" function is enabled, the SSM function is evaluated as an
active monitoring function and, after a STOP F, also results in a follow-up response STOP
B/STOP A.