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PROFIsafe address
Every F-I/O has a PROFIsafe address. This address is used to receive safety frames from
the fail-safe CPU or send safety frames to the fail-safe CPU.
Proof-test interval
The proof-test interval is the time period after which a component must be put into fail-safe
state. That is, it is replaced by an unused component or it is proven to be completely fault-
free.
Reintegration
Once a fault/error has been eliminated, the F-I/O must be reintegrated (depassivated).
Reintegration (switching from substitute values to process data) takes place either
automatically or following user acknowledgment.
For an F-I/O module with inputs, the process data queued at the failsafe inputs are made
available again to the safety program after reintegration. For an F-I/O module with outputs,
the output values for fail-safe outputs are sent again by the system to the fail-safe outputs.
Safe state
State of a unit in which safety is assured. In other words, the risk is acceptably low because
it has been established that safety-related malfunctions do not occur or because of the
safety measures taken to prevent possible safety-related malfunctions.
The basic principle of the safety concept in a fail-safe system is the existence of a safe state
for all process variables.
Safety class
Safety integrity level according to IEC 61508 and prEN 50129. The higher the safety integrity
level, the sharper the measures taken to avoid systematic errors and to control systematic
errors and random hardware failures.
Safety function
Safety function is a mechanism integrated in fail-safe CPUs and I/Os, enabling them to be
used in fail-safe systems. According to IEC 61508: A safety function is implemented by a
safety system to ensure that the system is kept in a safe state or brought into a safe state in
the event of a particular fault (user safety function).
Safety mode
Operating mode of the HMI device in which safety-related communication can be performed
via safety frames.
safety-related communication
Communication used to exchange fail-safe data.
KP8, KP8F
Operating Instructions, 10/2010, A5E03284305-01
Glossary
101
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