Siemens Simantic ET200SP System Manual page 303

Redundancy, availability-enhancing
Multiple instances of components with the objective of maintaining component functionality in
the event of hardware faults.
Redundancy, safety-enhancing
Multiple availability of components with the aim of exposing hardware faults based on
comparison; such as → 1oo2 evaluation in → fail-safe modules.
Reference identification
In accordance with EN 81346, a specific object is clearly referenced in relation to the system
to whose components the object belongs. Thus, unique identification of the modules in the
entire system is possible.
Reference potential
Potential from which the voltages of the participating circuits are considered and/or
measured.
Reintegration
After the elimination of a fault, it is necessary to ensure the reintegration (depassivation) of
the → F-I/O. Reintegration (switchover from fail-safe values to process values) occurs either
automatically or only after a user acknowledgment in the safety program.
In the case of a fail-safe input module, the process values pending at the fail- s afe inputs are
made available to the s afety program again after reintegration. In the case of a fail-safe
output module, the → fail-safe system transfers the output values in the safety program to the
fail-safe outputs again.
RIOforFA-Safety
Remote IO for Factory Automation with PROFIsafe; Profile for F-I/O
RoHS
EC Directive 2011/65/EU concerning the restriction of certain dangerous substances in
electrical and electronic devices regulates the use of hazardous substances in devices and
components. The English abbreviation RoHS is used to refer to this directive: (Restriction of
the use of certain hazardous substances), as well as all related measures for implementing it
into national legislation.
Safe state
The basic principle of the safety concept in F-systems is the existence of a safe state for all
process variables. For the digital F-I/O, for example, the safe state is the value "0".
Distributed I/O system
System Manual, 12/2016, A5E03576849-AG
Glossary
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