Overview
IEC 62541-24:2026 is an international standard published by the International Electrotechnical Commission (IEC) that defines the Scheduler component of the OPC Unified Architecture (OPC UA). This part 24 of the OPC UA series specifies a comprehensive information model enabling OPC UA Servers to expose, manage, and manipulate schedules for executing specific actions at designated dates and times. The standard facilitates automation by allowing precise control over when certain operations occur within an OPC UA environment.
The standard introduces a scheduler model that supports defining active dates for actions, including referencing global calendars such as public holidays. This scheduling framework ensures that time-based automation tasks can respect organizational or regional constraints, improving operational efficiency and compliance.
Key Topics
- Schedule Information Model: Defines how schedules are represented within an OPC UA Server, including dates, times, and associated actions.
- Global Calendars: Supports referencing external calendars, allowing schedules to adapt to holidays or special events automatically.
- Scheduling Actions: Covers various types of actions - writing Variables, invoking Methods, and extensibility for other custom actions.
- Use Cases: Detailed scenarios such as scheduling actions on specific weekdays, special dates, recurring intervals, and exceptions.
- OPC UA ObjectTypes: Includes CalendarType and ScheduleType with definitions for methods to add or remove date elements and exception schedules.
- DataTypes: SpecialEventType, CalendarEntryType, DateType, and other related types that provide structured data formats for accurate scheduling.
- Profiles and Conformance Units: Ensures interoperability by specifying compliance requirements for different scheduling functionalities.
- Namespace Management: Clarifies NamespaceUris for NodeIds and best practices for handling OPC UA namespaces in scheduling contexts.
Applications
IEC 62541-24:2026 is highly relevant for industries and applications requiring precise timed automation within OPC UA-enabled systems:
- Industrial Automation: Planning and executing maintenance cycles, batch processes, or quality control actions based on time schedules.
- Smart Manufacturing: Automating operations synchronized with work shifts, holidays, or exceptional events using calendaring capabilities.
- Building Automation: Managing lighting, HVAC, and security systems based on daily or seasonal schedules aligned with occupancy and local regulations.
- Energy Management: Scheduling energy consumption or production tasks around tariffs, peak periods, or regulatory restrictions.
- Utility Services: Coordinating actions like meter reading, system checks, or updates respecting calendars that include public holidays and exceptions.
- IoT Systems: Enabling device behaviors to align with specific time-related criteria, improving responsiveness and energy efficiency.
This standard offers a flexible framework that ensures time-based automation can be securely integrated, queried, and manipulated within OPC UA-based environments, enhancing reliability and maintainability.
Related Standards
- IEC 62541 Series (OPC UA): The suite of standards defining the OPC Unified Architecture framework for secure and interoperable industrial communication.
- IEC 62541-1: OPC UA Part 1 - Overview and Concepts: Provides the foundational principles of OPC UA, complementing the Scheduler model.
- IEC 62541-5: OPC UA Part 5 - Information Model: Details the general information modeling framework used by scheduling and other OPC UA specifications.
- IEC 62541-9: OPC UA Part 9 - Alarms and Conditions: Relevant for integrating time-based conditions and alerting with scheduled events.
- IEC 62541-11: OPC UA Part 11 - Historical Access: For systems requiring audit trails or reviewing historical schedules and actions.
- ISO 8601: International standard for date and time formats, which is harmonized with the scheduler’s date/time representations.
- Industry-Specific Scheduling Standards: May be used alongside IEC 62541-24 for domain-specific scheduling requirements.
By adhering to IEC 62541-24:2026, organizations can leverage a standardized and extensible scheduler that integrates seamlessly into OPC UA infrastructures, supporting robust time-based automation for diverse electric, electronic, and industrial processes.
