Overview
IEC 61158-4-3:2019 is an internationally recognized standard developed by the International Electrotechnical Commission (IEC) for industrial communication networks, focusing on fieldbus specifications. Specifically, this document details the data-link layer protocol specification for Type 3 elements, a critical aspect in ensuring reliable and timely communication among devices in industrial automation environments. As part of the broader IEC 61158 series, this standard provides essential requirements to enable compatibility and interoperability between automation components, such as sensors and actuators, within a distributed control system.
This fourth edition of IEC 61158-4-3 cancels and replaces the previous (2014) edition and includes key technical corrections and editorial improvements, ensuring the standard remains aligned with current industry needs.
Key Topics
IEC 61158-4-3:2019 addresses several important areas related to the data-link layer in fieldbus systems:
- Procedures for Data and Control Information Transfer: Defines how data and control signals are exchanged between data-link user entities and across the network.
- Distributed Data-Link Service Provider: Describes the formation and operation of the data-link entities providing services to user entities in a distributed manner.
- Data-Link Protocol Data Units (DLPDUs): Details the structure, encoding, and meaning of DLPDUs as they are used to transfer information across the protocol.
- Media Access Control and Transmission Modes: Explains how opportunities for communication are assigned, particularly focusing on cyclic asynchronous access for master devices and other managed access for non-master devices.
- Operational Elements: Outlines key protocol elements such as frame check sequences, timing mechanisms, state machines, and error detection procedures.
- Conformance and Applicability: Specifies the requirements for compliance and addresses a variety of industrial network environments.
Applications
The data-link layer protocol detailed in IEC 61158-4-3 is pivotal in various industrial sectors that demand robust, time-critical communication solutions. Typical applications include:
- Factory Automation: Integration of sensors, controllers, and actuators in real-time process control environments.
- Process Control Systems: Ensuring reliable transfer of data between field devices and control systems in industries like oil & gas, chemicals, and utilities.
- Distributed Control Systems (DCS): Enabling interoperability and open system integration among devices provided by different manufacturers.
- Industrial Ethernet and Fieldbus Implementations: Used as the foundation for higher-level industrial communication protocols.
This standard is integral for system integrators, equipment manufacturers, and network engineers looking to design or maintain industrial communication networks that require deterministic and fault-tolerant data exchange.
Related Standards
IEC 61158-4-3:2019 is part of the comprehensive IEC 61158 series, which sets the foundation for fieldbus communication. Relevant related standards include:
- IEC 61158-1: Fieldbus reference model and system overview.
- IEC 61158-2: Physical layer specification and service definition.
- IEC 61158-3-x: Data-link layer service definitions for various protocol types.
- IEC 61784-1 and IEC 61784-2: Provide profiles and further context for specific applications and protocol combinations.
- Other IEC 61158-4-x Parts: Specifications for data-link layer protocol for other protocol types, ensuring wide applicability and modularity across different fieldbus technologies.
By following IEC 61158-4-3 and related industrial communication standards, organizations can achieve higher levels of system reliability, interoperability, and performance, enabling seamless integration and operation of automation components from diverse sources. This is essential in today’s Industry 4.0 and smart manufacturing environments.
Open preview (PDF)Industrial communication networks - Fieldbus specifications - Part 4-3: Data-link layer protocol specification - Type 3 elements
