Status LEDs: Voltage 2.0-3.3V DC, Current 10-20mA per LED

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

Parameter	Typical range	Notes & selection driver
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

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 3864-1, IEC 60073, DIN EN 60073

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

Typical Suppliers & Equivalents

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

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Status LEDs

Manufacturer profiles associated with Status LEDs.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Status LEDs