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What Is an Optoelectronic Safety Light Curtain?

How Does a Safety Light Curtain Work?

The operating principle is simple but highly precise.

1. The transmitter emits synchronized infrared light beams.

2. The receiver continuously monitors beam integrity.

3. If a beam is interrupted, the OSSD safety outputs change state.

4. The machine control system initiates a safe stop according to safety standards.

Modern safety light curtains often include advanced functions such as:

• Blanking – ignoring fixed objects in the detection field,

• Muting – temporary suspension of the safety function during material transport,

• EDM (External Device Monitoring) – monitoring external safety relays or contactors.

These features allow flexible integration into complex industrial applications.

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Where Are Safety Light Curtains Used?

Optoelectronic safety light curtains are widely applied across industrial sectors, including:

• Press brakes and mechanical presses,

• CNC machining centers,

• Assembly and robotic lines,

• Packaging systems,

• Automated sorting and palletizing systems.

Unlike fixed mechanical guards, light curtains provide fast and ergonomic access to the working area. This improves productivity while maintaining a high safety level.

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Resolution – What Does It Mean?

One of the most important technical parameters is resolution, which defines the smallest object the curtain can detect.

• 2.5 mm / 5 mm / 7.5 mm – finger protection (high resolution),

• 10 mm / 14 mm / 15 mm – finger and hand protection,

• 20 mm / 25 mm – hand protection,

• 30 mm / 40 mm / 80 mm – body protection,

• 200 mm – full body access protection.

Correct resolution selection depends on the machine type, stopping time, and safety distance calculation.

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Safety Standards and Compliance

Safety light curtains must comply with strict international and European safety standards. Devices are classified according to Performance Level (PL) and Safety Integrity Level (SIL) requirements.

Proper certification ensures that the device can be safely integrated into machines with a defined risk category. A comprehensive risk assessment should always precede selection and installation.

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Why Use Safety Light Curtains in Industrial Automation?

In modern manufacturing environments, safety is not optional. It is a fundamental requirement.

An optoelectronic safety light curtain:

• Protects operators from injury,

• Reduces downtime caused by accidents,

• Improves workflow efficiency,

• Supports compliance with the Machinery Directive,

• Enhances overall machine reliability.

When properly selected and installed, it increases safety without compromising productivity.

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Conclusion

An optoelectronic safety light curtain is an advanced non-contact protective solution used in industrial automation. It reacts instantly to intrusion, meets strict safety standards, and provides reliable machine guarding.

If you are designing a new machine or upgrading an existing production line, integrating a safety light curtain is one of the most effective ways to protect operators and meet compliance requirements.

At morkom-tech.com, you can find safety light curtain solutions tailored to various industrial applications – from high-resolution finger protection to full-body access safeguarding.

Posted in: Sample Category