INDUSTRY COMPONENT

Status LEDs

Status LEDs are visual indicators on PLC modules that display operational states, errors, and communication status through colored lights.

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Component Specifications

Definition
Status LEDs are electronic components integrated into Programmable Logic Controller (PLC) modules that provide real-time visual feedback about system conditions. These indicators use different colors (typically green, red, amber, and yellow) and blinking patterns to communicate power status, CPU operation, I/O activity, network communication, and fault conditions. They serve as primary diagnostic tools for maintenance personnel and operators in industrial environments.
Working Principle
Status LEDs operate by converting electrical signals from the PLC's monitoring circuits into visible light through semiconductor diodes. Each LED is connected to specific monitoring points within the PLC circuitry. When a particular condition is detected (such as power on, program running, or error occurrence), the corresponding circuit sends a voltage signal to the LED, causing it to illuminate with a specific color and pattern. The LED's brightness, color, and blinking frequency are controlled by the PLC's firmware based on predefined status codes.
Materials
LED chips: Gallium Arsenide Phosphide (GaAsP) or Gallium Phosphide (GaP) for colored LEDs, Aluminum Gallium Indium Phosphide (AlGaInP) for high-brightness applications. Housing: Polycarbonate (PC) or Acrylonitrile Butadiene Styrene (ABS) plastic with diffuser lenses. Contacts: Copper alloy with gold or tin plating. Circuit board: FR-4 glass epoxy substrate.
Technical Parameters
  • MTBF >100,000 hours
  • Current 10-20mA per LED
  • Voltage 2.0-3.3V DC
  • IP Rating IP20 (panel mounted)
  • Color Options Green, Red, Amber, Yellow, Blue, White
  • Viewing Angle 120-160 degrees
  • Blinking Patterns Continuous, Slow Blink (1Hz), Fast Blink (4Hz), Double Blink
  • Luminous Intensity 20-100 mcd
  • Operating Temperature -20°C to +70°C
Standards
ISO 3864-1, IEC 60073, DIN EN 60073

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Status LEDs.

PLC status indicators industrial LED lights machine status lights automation diagnostics fault indication lights HMI status indicators Status LEDs Status LEDs in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

PLC Module

A modular electronic unit that forms part of a Programmable Logic Controller (PLC) system, providing specific control functions within an industrial automation setup.

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Digital Input Module

A hardware component that receives and processes digital signals from field devices for a PLC system.

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Engineering Analysis

Risks & Mitigation
  • Electrical shock during maintenance
  • Misinterpretation of status codes leading to incorrect troubleshooting
  • LED failure causing loss of diagnostic capability
  • Environmental contamination affecting visibility
FMEA Triads
Trigger: Voltage spikes or power surges
Failure: LED burnout or premature degradation
Mitigation: Install surge protection devices, use current-limiting resistors, implement proper grounding
Trigger: Environmental contaminants (dust, moisture, chemicals)
Failure: Reduced visibility or complete obscuring of LED indicators
Mitigation: Regular cleaning schedules, use of protective covers, proper enclosure sealing
Trigger: Vibration or mechanical stress
Failure: Broken solder joints or damaged LED components
Mitigation: Use vibration-resistant mounting, implement strain relief for connections, regular inspection protocols

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±5% for voltage and current specifications, ±10° for viewing angle, color consistency within 5nm wavelength
Test Method
IEC 60068-2 environmental testing, photometric measurement per CIE 127, electrical testing per IEC 61347, vibration testing per IEC 60068-2-6

Buyer Feedback

★★★★☆ 4.6 / 5.0 (33 reviews)

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

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

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

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Frequently Asked Questions

What do different LED colors indicate on PLC modules?

Green typically indicates normal operation or power on, red indicates errors or faults, amber/yellow shows warnings or standby mode, and blue often indicates communication activity or special functions.

How do I troubleshoot non-functional status LEDs?

First check power supply to the PLC module, verify LED connections on the circuit board, test with known good LEDs, check PLC firmware settings for LED control, and inspect for physical damage or contamination.

Can status LEDs be replaced individually?

Most industrial PLC modules have surface-mounted LEDs that require specialized equipment for replacement. Some modular designs allow LED replacement at component level, but typically the entire status indicator assembly or PLC module is replaced.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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