SMS - Safe Maximum Speed Function
The Safety Module continuously monitors the parameterized Safe Maximum Speed (SMS) (set via the Safety Module device parameter SMS_MaxSpeed) regardless of the requested safety-related functions.
Monitoring by the Safety-Related FB/Safety Module
As the SMS monitoring function is continuously active, no function block input is available/required to request it. However, a function block output for indicating its activity is provided.
For the SMS safety-related function, no delay or monitoring times have to be parameterized.
In contrast to other safety-related functions, the safe maximum speed (Vmax in the figure) is continuously monitored.
STO and SMS have the highest priority of the available safety-related functions.
If the defined safe maximum speed is exceeded, first the SS1 function and afterwards the STO function are automatically executed as the fallback functions.
An active fallback function is indicated by switching the corresponding function block S_SS1_SafetyActive or S_STO_SafetyActive to SAFETRUE.
