M12 Plug Connector with Transparent Housing and Malfunction LED
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Solution Overview
Problem
Existing plug connectors for field devices in automation technology lack the ability to visually indicate disturbances or malfunctions on-site, leading to delayed detection and potential degradation of plant functionality.
Innovation Solution
A plug connector with a transparent material connection plug featuring at least four display elements, including LEDs that signal operational readiness, switch outputs, and a malfunction indicator, utilizing a logic circuit to detect and unmistakably display malfunctions using a red LED, even in compact designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional connection plugs with LEDs are used to display operating voltage and switch outputs, then visual indication of operational status is achieved, but the ability to indicate disturbances or malfunctions on-site is lost
Solution Approach 1:
The patent combines multiple functions into a single connection plug: displaying operating voltage, switch outputs, and disturbance/malfunction indication all within one integrated plug unit. The circuit combines the evaluation of multiple signals (voltage presence, switch states) to generate a unified malfunction indication, merging diagnostic functions that would otherwise require separate components.
Solution Approach 2:
The connection plug serves multiple functions simultaneously: it provides electrical connection, displays operational status via LEDs, and detects malfunctions by evaluating switch output consistency. The single plug unit universalizes the indication system to cover both normal operation monitoring and abnormal condition detection without requiring separate devices.
2Volume of moving object
If the connection plug dimensions are kept compact (e.g., M12 plug), then space saving is achieved, but the number of display elements and circuit components is limited
Solution Approach 1:
The patent arranges four LED display elements in a compact spatial configuration within the connection plug housing, utilizing the three-dimensional space efficiently. The LEDs are positioned to be visually accessible while maintaining the standard M12 plug dimensions, solving the space constraint by optimizing spatial arrangement rather than reducing functional capacity.
Solution Approach 2:
The connection plug housing is made at least partially transparent, allowing the LED display elements to be visible from the outside without requiring additional windows or openings. This transparent shell approach enables full display functionality while maintaining compact dimensions, as the housing itself serves as the display window.
3Reliability
If a logic circuit is added to detect malfunctions based on switch outputs, then on-site disturbance detection is enabled, but the circuit component count increases
Solution Approach 1:
The logic circuit continuously monitors the switch output signals in real-time, evaluating their consistency before a malfunction becomes apparent. By preliminarily detecting inconsistencies between the two antivalent switch outputs, the system can immediately indicate potential failures via the fourth LED, enabling early intervention before the field device fails completely.
Solution Approach 2:
The logic circuit creates a feedback mechanism where the state of the two switch outputs is continuously evaluated and fed back to the display system. When the switch outputs are inconsistent (both low or both high when they should be opposite), the feedback triggers the fourth LED to indicate a malfunction, closing the loop between sensor output and status indication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables immediate on-site identification of field device malfunctions, reducing downtime and ensuring timely maintenance by clearly indicating issues through a distinct red LED activation.
Implementation Method 1
The display elements are preferably LEDs
Data Source
AI summary
In a plug connector for connecting a field device of automation technology to an energy supply and/or to an evaluation unit, the plug connector includes a connection plug (M12) for the field device, wherein the connection plug (M12) is composed, at least partially, of a transparent material, wherein at least four display elements (gn ye, ye, rd) are arranged in the connection plug (M12). A first display element (gn) signals operational readiness of the field device; second and third display elements (ye, ye) signal two antivalent switch outputs (MIN, MAX) of the field device; and a fourth display element (rd) signals a disturbance or malfunction of field device. A circuit (NOR, XNOR) is provided to detect a disturbance or malfunction of field device based on the antivalent switch outputs (MIN, MAX) of the field device, and to activate fourth display element (rd) upon detection.