IEC 61158-5-23:2014

Overview

IEC 61158-5-23:2014 is an International Electrotechnical Commission (IEC) standard titled "Industrial communication networks - Fieldbus specifications - Part 5-23: Application layer service definition - Type 23 elements." This standard defines the application layer services and structure for Type 23 fieldbus communication systems used in industrial automation. It focuses on the interaction between user applications and the fieldbus application layer, ensuring interoperability and reliable communications in industrial networks.

Developed in alignment with the OSI Basic Reference Model (ISO/IEC 7498-1) and the OSI application layer structure (ISO/IEC 9545), IEC 61158-5-23 provides an abstract framework for defining application resources, primitive actions, their parameters, and their valid sequences. It supports both time-critical and non-time-critical messaging, essential for safety, reliability, and efficiency in automation environments.

Key Topics

• Application Layer Service Definition:
  • Specifies the interface and services available at the boundary between the user and the application layer, and between the application layer and systems management.
  • Establishes abstract models for application resources (objects) that can be manipulated via fieldbus services.
• Service Structure:
  • Details service primitives, actions, events, and associated parameters.
  • Outlines the interaction between various service elements and their valid sequences in communication.
• Type 23 Fieldbus Elements:
  • Defines roles for nodes, including master station, slave station, management node, and synchronization manager.
  • Identifies mechanisms for both cyclic and transient transmission, covering periodic and on-demand data exchanges.
• Terminology and Conventions:
  • Clarifies the use of terms such as Application Entity (AE), Application Service Element (ASE), and communication models like cyclic and transient models.
  • Provides a structure for defining and utilizing data types and class definitions for fieldbus services.

Applications

IEC 61158-5-23:2014 is highly relevant in the industrial automation sector, specifically for:

• Industrial Communication Networks:
  • Ensures smooth interaction and data transfer between devices such as sensors, actuators, controllers, and management systems.
• Process Control and Automation:
  • Supports time-critical messaging for applications requiring stringent timing, such as safety interlocks, real-time measurements, and equipment coordination.
  • Enables efficient non-time-critical information exchange for system diagnostics, configuration, and maintenance.
• System Integration:
  • Facilitates the integration of devices from multiple vendors by standardizing application layer interfaces, thus reducing complexity and enhancing system compatibility.
• Migration and Interoperability:
  • Provides a basis for transitioning from legacy industrial communication protocols to modern fieldbus systems without significant restructuring.

Related Standards

For comprehensive deployment of fieldbus communication in industrial automation, consider the following related standards:

• IEC 61158-1: Overview and guidance for the IEC 61158 and IEC 61784 series.
• IEC 61158-6 (all parts): Application layer protocol specification, detailing protocol implementations for different fieldbus Types.
• IEC 61784-1 & IEC 61784-2: Additional fieldbus profiles and protocol type combinations.
• ISO/IEC 7498-1: OSI Basic Reference Model, providing foundational reference architecture.
• ISO/IEC 9545: OSI Application Layer Structure.
• ISO/IEC 646, ISO/IEC 8822, ISO/IEC 8824-1, ISO/IEC 10731: Provide further specifications for character sets, presentation service, notation, and service conventions in the OSI model context.

Practical Value

Implementing IEC 61158-5-23:2014 ensures standardized, reliable, and safe communication in fieldbus-based industrial networks. Adopting this standard:

• Promotes interoperability across devices and systems.
• Reduces integration risks and costs.
• Improves real-time control and monitoring in automation operations.
• Supports scalable, future-proof system architectures appropriate for complex industrial environments.

For manufacturers, system integrators, and plant operators, compliance with IEC 61158-5-23 boosts operational efficiency and aligns with international best practices in industrial communication networks.