Terms and definitions
8 TTH200, TTR200, TTH300, TTF300, TTF350 SM/TTX200/TTX300/SIL-EN
5 Terms and definitions
Terms Definitions
Dangerous failure A failure that has the potential to place the safety-related system in
a dangerous state or render the system inoperative.
Safety-related system A safety-related system carries out the safety functions that are
required to achieve or maintain a safe state, e.g., for a system.
Example: A pressure meter, a logics unit (e.g., limit transmitter) and
a valve constitute a safety-related system.
Safety-related
functions
A specified function that is carried out by a safety-related system
with the goal, under consideration of a defined dangerous incident,
of achieving or maintaining a safe state for the system. Example:
limit temperature monitoring.
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