This International Standard establishes requirements for data
communication which is used in systems performing category A
functions in nuclear power plants.
It covers also interface requirements for data communication of
equipment performing category A functions with other systems
including those performing category B and C functions and functions
not important to safety.
The scope of this standard is restricted to the consideration of
data communication within the plant I&C systems. It does not
cover communication by telephone, radio, voice, fax, email, public
The internal operation and the detailed technical specification
of data communication equipment are not in the scope of this
standard. This standard is not applicable to the internal
connections and data communication of a processor unit, its memory
and control logic. It does not concern the internal processing of
instrumentation and control computer systems.
This standard gives requirements for functions and properties of
on-line plant data communications by reference to IEC 60880 and IEC
60987, produced within the framework of IEC 61513. It requires
classification of the communication functions in accordance with
IEC 61226, which in turn requires environmental and seismic
qualification (i.e., the environment where the safety function is
required to operate) according to IEC 60780 and IEC 60980
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