Overview
IEC TR 61734:2006, titled Application of symbols for binary logic and analogue elements, is a technical report published by the International Electrotechnical Commission (IEC). It provides comprehensive guidelines and conventions for applying IEC 60617 symbols to catalogues of real devices that feature binary logic and analogue components. The document aims to promote consistency and clarity in the graphical representation of these elements across various applications, regardless of the symbol originator. By following this standard, designers and engineers can ensure accurate functional representation while maintaining a uniform visual appearance.
This report consolidates useful conventions for symbol-making, including preferable choices when multiple techniques exist within IEC 60617. It covers symbolic representations of logic gates, analogue elements, power supplies, internal connections, and specialized symbols such as those for hysteresis and amplification.
Key Topics
- Common Conventions for Symbols: Guidelines on how to uniformly depict symbols for white-box and gray-box representations, including terminals, power-supply designations, and negation symbols.
- Representation of Inputs and Outputs: Detailed arrangements for inputs, outputs, and internal bus connections to enhance readability and accuracy.
- Embedded and Composite Symbols: Instructions on how to use nested symbols and illustrate relationships within complex elements.
- Device-Specific Symbols: Standardized symbols for memory devices like ROM, PROM, and EPROM, as well as specialized signaling methods like scan-test functions.
- Power and Control Designations: Symbolizing power-down states, common control blocks, and reference voltages, including adjustable variants.
- Design Order and Structure: The recommended ordering of operators, symbol boundaries, external designations, and qualification markings.
- Dynamic and Fixed-Mode Inputs: Clarifications concerning signal types such as dynamic inputs, fixed logic levels, and three-state outputs.
- Special Features: Symbols for hysteresis effects, amplification combined with logic elements, and bidirectional port qualifiers.
Applications
IEC TR 61734:2006 is valuable for professionals involved in electronic design, documentation, and device cataloguing, such as:
- Electrical and Electronics Engineers: To ensure consistent and clear symbol usage in circuit diagrams and technical documentation.
- Technical Illustrators and CAD Designers: For creating symbols that comply with international standards, making device schematics universally understandable.
- Manufacturers of Binary and Analogue Devices: To standardize presentation in product catalogues, improving customer comprehension and reducing errors.
- Standards Organizations and Committees: For developing or updating related normative documents corresponding to graphical representation of logic and analogue elements.
- Educational Institutions: As teaching material for electronics courses emphasizing international symbol conventions.
Using IEC TR 61734 helps harmonize the appearance and function of symbols describing complex logic and analogue components in electronic systems, improving communication between designers, manufacturers, and end-users worldwide.
Related Standards
- IEC 60617 – Graphical Symbols for Diagrams: The foundational standard defining a broad set of graphical symbols including logic and analogue components used in IEC TR 61734.
- IEC 60034 – Rotating Electrical Machines: Although distinct, it follows the IEC’s publication numbering and structure conventions referenced in IEC TR 61734.
- ISO/IEC Directives: Governing development and numbering of international standards ensuring coherence in technical documentation practices.
- Other IEC Technical Reports and Specifications: That cover circuit design, device testing, and symbolic representation across electrical and electronic domains.
By adhering to IEC TR 61734:2006, users ensure their binary logic and analogue element symbols are consistent, accurate, and internationally recognized, thereby facilitating clear communication and interoperability within the electronics industry.