EN IEC 61500 pdf download.NUCLEAR POWER PLANTS – INSTRUMENTATION AND CONTROL SYSTEMS IMPORTANT TO SAFETY – DATA COMMUNICATION IN SYSTEMS PERFORMING CATEGORY A FUNCTIONS
1 Scope
This document 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 document is restricted to the consideration of data communication within the plant I&C safety systems. It does not cover communication by telephone, radio, voice, fax, email, public address, etc. The internal operation and the detailed technical specification of data communication equipment are not in the scope of this document. This document is not applicable to the internal connections and data communication of a processor unit, its memory and control logic. It does not address the internal processing of instrumentation and control computer based systems. This document gives requirements for functions and properties of on-line plant data communication by reference to IEC 60880 and IEC 60987, produced within the framework of IEC 61 51 3. It requires categorisation of the communication functions in accordance with IEC 61 226, which in turn requires environmental and seismic qualification (i.e., the environment where the safety function is required to operate) according to IEC/IEEE 60780-323 and IEC 60980.
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60880, IAEA safety glossary, IAEA safety guide No. SSG-39 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 communication channel logical connection between two end-points within a communication system [SOURCE: IEC 61 784-3:201 6, 3.1 .8] 3.2 communication node connection point on a communication network, at which data is conveyed via communication channels to or from that point to other points on the network 3.3 communication system arrangement of hardware, software and propagation media to allow the transfer of messages (ISO/IEC 7498-1 application layer) from one application to another [SOURCE: IEC 61 784-3:201 6, 3.1 .9] 3.4 cybersecurity set of activities and measures the objective of which is to prevent, detect, and react to: – malicious disclosures of information (confidentiality) that could be used to perform malicious acts which could lead to an accident, an unsafe situation or plant performance degradation; – malicious modifications (integrity) of functions that may compromise the delivery or integrity of the required service by I&C programmable digital systems (incl. loss of control) which could lead to an accident, an unsafe situation or plant performance degradation; – malicious withholding or prevention of access to or communication of information, data or resources (incl. loss of view) that could compromise the delivery of the required service by I&C systems (availability) which could lead to an accident, an unsafe situation or plant performance degradation Note 1 to entry: This definition is tailored with respect to the IEC 62645 scope and overall IEC SC 45A document structure. It is recognized that the term “cybersecurity” has a broader meaning in other standards and guidance, often including non-malevolent threats, human errors and protection against natural disasters. Those aspects – except human errors degrading cybersecurity – are not included in the concept of cybersecurity used in the IEC SC 45A standard series. See Annex A of IEC 62645:201 4 for more detail about such exclusions. Note 2 to entry: Computer security, security and cybersecurity are considered synonymous in this document. [SOURCE: IEC 62645:201 4, 3.6, modified: “disclosures” replaced by “malicious disclosures”, and notes 1 and 2 modified] 3.5 data communication exchange of digital data between communication nodes via communication channels 3.6 data communication equipment embodiment of the media, modulation and coding-dependent portion of a bus-connected device, comprising the lower portions of the physical layer within the device [SOURCE: IEC 61 1 58-2, 201 4, 3.1 .9, modified:”fieldbus” replaced by “bus”]
EN IEC 61500 pdf download
