Glossary
Safety Manual
24 Operating Instructions, 06/2012, A5E03433511-05
Safety function
Defined function executed by a safety-instrumented system with the objective of achieving or
maintaining a safe system status which takes into account a defined occurrence of
dangerous failures.
Example:
Monitoring of user-defined limit values.
Safety-instrumented system
A safety-instrumented system excludes the safety functions that are required to achieve or
maintain a safe status in a system. It consists of a sensor, a logic unit/control system and a
final controlling element.
Example:
A safety-instrumented system is made up of an analyzer (e.g. to measure an O
2
concentration), a PLC and a control valve.
Sensor
Converter that converts mechanical or other non-electrical variables into electrical signals.
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