Event Queue: Queue Capacity 1000-10000 events

Q: 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.

Q: 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.

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

Parameter	Typical range	Notes & selection driver
Persistence	Optional disk backup
Queue Capacity	1000-10000 events
Priority Levels	High, Medium, Low
Processing Latency	<10 ms
Concurrency Support	Multi-threaded

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 13849-1, IEC 61131-3, IEC 61508

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

Typical Suppliers & Equivalents

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.

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Event Queue

Manufacturer profiles associated with Event Queue.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

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