Siemens SIMATIC S7 F Manual page 349

1oo1 evaluation
Safety system
Safety-related
Sensor Evaluation
SIL
Standard mode
Fail-Safe Systems
A5E00085588-03
Type of sensor evaluation: In 1oo1 evaluation, there is one sensor and it
is connected to the module via a single channel.
A system (including all devices, units and safety circuits) that protects
people and the system. This particularly includes systems for flame
control, the interruption of fuel infeed and the ventilation of combustion
chambers.
If this is achieved with multi-channel systems, the safety system consists
of all the channels and monitoring equipment that contribute to safety.
-> Fail-safe
There are two types of sensor evaluation:
•
1oo1 evaluation: The sensor signal is read once
•
1oo2 evaluation: To increase availability, the sensor signal is read in
twice from the same module and compared internally.
-> Safety integrity level
Operating mode of the fail-safe signal modules
In standard mode, the fail-safe signal modules behave in the same way
as the SIMATIC S7-300 standard signal modules.
Glossary
Glossary-5