IEC 61158-5-21:2019
Industrial communication networks - Fieldbus specifications - Part 5-21: Application layer service definition - Type 21 elements
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About This Item
IEC 61158-5-21:2019 defines the application layer service definition for Type 21 elements within industrial communication networks and fieldbus specifications. It is relevant for teams that need a clear technical reference for how higher-level communication services are structured and evaluated in automation environments. For engineering, testing, and procurement workflows, IEC 61158-5-21:2019 helps establish a consistent basis for documented evaluation, technical review, and conformity assessment when selecting or validating fieldbus-related communication functions.
Overview of IEC 61158-5-21:2019
As part of the IEC 61158 series, the document focuses on application layer service definition rather than physical installation details. Its scope is centered on Type 21 elements, making it useful when assessing the service behavior expected within a fieldbus communication stack. Organizations may use it to support engineering documentation, interface analysis, and technical validation activities where precise service definitions are needed for operational consistency and controlled implementation.
Compliance applications of IEC 61158-5-21:2019
IEC 61158-5-21:2019 is commonly consulted in product evaluation, system integration, and laboratory verification work involving industrial communication equipment. It can support compliance workflows for vendors, test houses, and end users that need to align application layer behavior with documented requirements during technical assessment. The reference is also useful in procurement reviews where interoperability expectations, system compatibility, and verification activities must be considered before deployment or acceptance.
Importance of compliance with IEC 61158-5-21:2019
Using IEC 61158-5-21:2019 as a reference helps reduce ambiguity in service behavior and supports more consistent testing and engineering validation. That is valuable for interoperability, risk management, and quality assurance when multiple devices or controllers must operate together reliably. It may also streamline conformity assessment preparation by giving teams a stable technical basis for documentation, acceptance criteria, and traceable technical compliance across development and procurement workflows.
- Application layer service definition for Type 21 fieldbus elements
- Support for engineering documentation and interface evaluation
- Useful for verification activities in industrial communication testing workflows
- Helps align procurement and integration decisions with technical compliance needs
- Publication Date: 2019-10-04
- Standard Status: Original
- Publisher: IEC
- Edition: 2
- This Version: IEC 61158-5-21:2019 (2019-10-04)
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