INDUSTRY COMPONENT

Event Queue

Event Queue is a software component in industrial automation that manages and prioritizes asynchronous events in real-time control systems.

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Component Specifications

Definition
An Event Queue is a critical software component within industrial Event Systems that buffers, sequences, and dispatches asynchronous events based on priority, timestamp, or other scheduling algorithms. It ensures deterministic processing of operational events like sensor triggers, alarms, state changes, and user commands in manufacturing equipment, preventing data loss and maintaining system responsiveness under varying loads.
Working Principle
Operates on a First-In-First-Out (FIFO) or priority-based queuing principle, where incoming events from sources like PLCs, sensors, or HMIs are stored temporarily in a buffer. The queue manager processes events sequentially or by priority, handling concurrency through threading or interrupt mechanisms to ensure real-time performance in industrial environments.
Materials
Software-based (no physical material); typically implemented in programming languages like C++, Python, or Java within industrial runtime environments (e.g., IEC 61131-3 for PLCs, or real-time operating systems).
Technical Parameters
  • Persistence Optional disk backup
  • Queue Capacity 1000-10000 events
  • Priority Levels High, Medium, Low
  • Processing Latency <10 ms
  • Concurrency Support Multi-threaded
Standards
ISO 13849-1, IEC 61131-3, IEC 61508

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Event Queue.

industrial event queue automation software real-time control PLC event management manufacturing system events priority queuing Event Queue Event Queue in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Event System

A software component within a User Interface Framework that manages and responds to user interactions and system events.

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Engineering Analysis

Risks & Mitigation
  • Queue overflow leading to event loss
  • Increased latency under high load
  • Software bugs causing deadlocks
FMEA Triads
Trigger: Insufficient queue capacity or poor memory management
Failure: Event loss or system crash
Mitigation: Implement dynamic resizing, monitor queue usage, and add overflow handling routines.
Trigger: Priority inversion or scheduling errors
Failure: Delayed critical events
Mitigation: Use robust scheduling algorithms (e.g., rate-monotonic) and regular testing under peak loads.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Latency tolerance <10 ms for high-priority events; zero data loss under normal operating conditions.
Test Method
Simulated load testing with event injection, compliance with IEC 61131-3 for functional safety, and validation via hardware-in-the-loop (HIL) setups.

Buyer Feedback

★★★★☆ 4.6 / 5.0 (17 reviews)

"The technical documentation for this Event Queue is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Machinery and Equipment Manufacturing environments. No issues with the Event Queue so far."

"Testing the Event Queue now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the primary function of an Event Queue in industrial systems?

It ensures orderly and timely processing of asynchronous events, such as machine alarms or sensor data, to maintain system stability and prevent overloads in real-time operations.

How does an Event Queue handle high-priority events?

By using priority-based scheduling, where critical events (e.g., emergency stops) are placed at the front of the queue for immediate processing, overriding standard FIFO order.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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