Terms And Definitions - ABB TTH300 Safety Instructions

Terms and definitions

5 Terms and definitions
Terms
Dangerous failure
Safety-related system
Safety-related
functions
8
Definitions
A failure that has the potential to place the safety-related system in
a dangerous state or render the system inoperative.
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.
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.
TTH200, TTR200, TTH300, TTF300, TTF350 SM/TTX200/TTX300/SIL-EN