Overview
IEC 61158-4-19:2014 is an international standard published by the International Electrotechnical Commission (IEC) that defines the data-link layer protocol specifications for industrial communication networks, specifically the fieldbus Type 19 elements. This third edition, released in 2014, revises the previous 2010 edition to enhance communication reliability and performance in industrial automation environments.
The core purpose of IEC 61158-4-19 is to specify the procedures and structures necessary for timely and reliable transfer of data and control information between data-link user entities. It outlines the construction of Fieldbus Data-Link Protocol Data Units (DLPDUs), facilitating communication among distributed data-link entities with an emphasis on real-time capabilities.
Key enhancements in this edition include:
- Transitioning to a producer-consumer model for connection management
- Introducing advanced mechanisms for timestamping and oversampling
- Improving hotplug and redundancy support
- Enhancing phase switching and error handling processes
Key Topics
The standard is detailed and covers various critical aspects of the data-link layer protocol, including:
- Data-Link Protocol Overview: Structural definitions of DLPDUs, identification methods, and header formats essential for data transfer integrity.
- Connection Mechanisms: Definitions on how communication connections are formed, maintained, and managed based on the producer-consumer paradigm.
- Communication Management: Procedures for initialization, cyclic communication control, network topology considerations (including ring topologies), redundancy, and hot-plug functionality to ensure uninterrupted communication in dynamic environments.
- Data Transmission Methods: Specifications for service channels, real-time (RT) channels, multiplexing strategies, and handling of real-time bits to support precise and efficient data exchange.
- Timing and Synchronization: Details on telegram timing, synchronization mechanisms, and processing methods to maintain data communication accuracy and determinism.
- Error Handling and Monitoring: Protocols for detection, response, and status reporting of communication errors, including invalid telegram management and diagnostic priorities.
The standard also contains exhaustive normative annexes covering identification numbers (IDNs) for data elements, which are crucial for device and network configuration.
Applications
IEC 61158-4-19:2014 serves as a foundational protocol specification for industrial fieldbus systems that require robust, deterministic communication at the data-link layer. Its applications include:
- Industrial Automation Systems: Enables reliable machine-to-machine communication across various manufacturing equipment and controllers.
- Process Control Networks: Facilitates timely data exchange critical for real-time monitoring and control in process industries.
- Distributed Control Systems (DCS): Supports complex network topologies and redundancy for fault-tolerant control architectures.
- Fieldbus Device Integration: Standardizes communication elements for devices implementing Type 19 fieldbus specifications, ensuring interoperability.
- Systems Requiring Enhanced Timing and Synchronization: Provides features like timestamping and oversampling, beneficial for precision measurement and control scenarios.
The standard’s capability to handle hotplugging and redundancy improves operational uptime and flexibility in dynamic industrial environments.
Related Standards
IEC 61158-4-19:2014 is part of the broader IEC 61158 series focusing on fieldbus communication protocols for industrial networks. Related standards include:
- IEC 61158-1: General fieldbus system definitions and requirements.
- IEC 61158-2: Physical layer specifications for fieldbus systems.
- IEC 61158-4: Specifies data-link layer protocols for different fieldbus types, including Type 19.
- IEC 61784: Profiles for fieldbus communication, often complementing IEC 61158 for application-layer integration.
- IEC 61850: Communication networks and systems in substations, which may interoperate with fieldbus technologies.
Implementing IEC 61158-4-19 ensures compatibility with other IEC fieldbus standards, fostering interoperability, scalability, and standardized industrial communications.
Keywords: IEC 61158-4-19, industrial communication networks, fieldbus specifications, data-link layer protocol, Type 19 elements, producer-consumer model, timestamping, oversampling, hotplug, redundancy, real-time communication, DLPDU, industrial automation, IEC standards.
Open preview (PDF)Industrial communication networks - Fieldbus specifications - Part 4-19: Data-link layer protocol specification - Type 19 elements
