ABB TTR200 Provozní pokyny stáhnout pdf (Strana 8)

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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ABB TTR200 Provozní pokyny Strana 8