IEC 61158-4-28:2023

Overview

IEC 61158-4-28:2023 is an international standard developed by the International Electrotechnical Commission (IEC) defining the data-link layer protocol specification for type 28 elements in industrial communication networks. As part of the IEC 61158 series dedicated to fieldbus specifications, this standard provides a robust framework for connecting industrial devices using a partial mesh network topology. The core aim is to enable communication where most failures between device interconnections can be bypassed, supporting non-redundant hierarchical device interconnections tailored to specific application requirements.

The standard specifies detailed procedures, message structures, and error handling methods within the data-link layer to ensure reliable, efficient communication across industrial fieldbus networks, facilitating device interoperability and network resilience.

Key Topics

• Partial Mesh Network Connectivity: The standard focuses on enabling partial mesh network configurations, helping circumvent failures between device connections while maintaining simplified hierarchical setups for typical industrial applications.

• Data-Link Layer Protocol: It defines the protocol architecture, message formats (DLPDU structures), addressing schemes, node management, and resource mapping at the data-link layer level, critical for interfacing field devices and managing data transmission.

• Node and Address Management: Specifications include node addressing, multicast group handling, resource allocation, and scheduling to optimize network communication and prevent data conflicts.

• Clock Synchronization: The document details procedures and message types for achieving precise clock synchronization across network devices, essential for time-critical industrial processes.

• Error Handling and Recovery: Robust mechanisms for detecting and managing errors such as CRC failures, lost connections, resource conflicts, and buffer overflows are described, sustaining network reliability and minimizing downtime.

• Protocol State Machines: State machine models for data link device entities (DLDE), management entities (DLME), and control entities (DLCE) guide implementation of dynamic protocol behaviors, including node joining, leaving, and data transmission.

• Message Structure and Service Conventions: The standard illustrates universal and specific data link protocol data unit (DLPDU) configurations, including configuration, allocation, status, and announcement messages.

Applications

IEC 61158-4-28:2023 is applicable across a broad spectrum of industrial automation and control systems where reliable field communication is a priority. Key applications include:

• Process Automation: Connecting sensors, actuators, and controllers in a partially meshed topology to ensure continuous operation despite possible link failures.

• Manufacturing Systems: Enabling flexible device interconnections and resource allocation in assembly lines and production machinery communications.

• Robotics and Motion Control: Providing synchronized communication with fault tolerance to guarantee precise operation in robot networks.

• Energy Management: Reliable data collection and control within smart grids and substations through resilient network topologies.

• Building Automation: Facilitating robust data exchange between distributed controllers and devices in intelligent building systems.

By implementing the IEC 61158-4-28 standard, industries benefit from enhanced network robustness, reduced communication downtime, and improved interoperability among heterogeneous devices.

Related Standards

IEC 61158-4-28:2023 aligns with other parts of the IEC 61158 series covering various aspects of fieldbus specifications, including:

• IEC 61158-2: Physical layer specifications complementing the data-link layer defined in part 4-28.

• IEC 61158-5: Application layer service definition aligning upper-layer communication functions with the data-link layer protocol.

• IEC 61784: Profiles for fieldbus communication enabling implementation in specific industrial environments.

• IEC 61558 series: Related standards providing overarching network frameworks and supplementary network layer protocols.

Together, these standards ensure a comprehensive, interoperable approach to designing and deploying industrial communication networks with resilience and efficiency.

Keywords: IEC 61158-4-28, industrial communication networks, fieldbus specifications, data-link layer protocol, partial mesh network, fieldbus data link, clock synchronization, node management, multicast groups, error handling, industrial automation communication, type 28 elements.