GL-R24L Keyence Safety Light Curtain | Body Protection System

Overview

Designed to safeguard hazardous industrial perimeters, the GL-R24L main unit represents an advanced Type 4 safety light curtain from the GL-R Series by Keyence. Configured with 24 optical axes and a 36.22" (920 mm) detection height, this GL-R24L barrier delivers reliable body-protection monitoring with a 40 mm beam pitch and a maximum operating range up to 49.21' (15 m). Built within a durable aluminum housing rated at IP65/IP67, it integrates flexible optical or wire synchronization alongside dual transistor OSSD outputs for critical machine safety loops.

Technical Specification Matrix

Mechanical Installation Protocol

• Mount the GL-R24L transmitter and receiver pairs rigidly onto opposing machine frame columns using secure vibration-dampening brackets.
• Align the optical axes carefully, utilizing the built-in beam indicators to achieve maximum effective aperture alignment within the ±2.5° limit.
• Route synchronization and OSSD control wiring through noise-shielded conduits, ensuring cable lengths stay within specified limits to minimize residual voltage drop (Max 2.5 V).
• Verify proper selection of PNP or NPN output wiring types to match your safety PLC or emergency shutdown logic configuration.

Commissioning and Operational Maintenance

• Test mutual interference prevention settings when operating dual adjacent GL-R systems by configuring channels via optical switches or wiring.
• Verify EDM (External Device Monitoring) loop functionality and response times during initial dry-run interlock checks.
• Inspect front protective covers periodically for dust, oil, or scratch accumulation that could trigger nuisance trips or obscure beam transmission.
• Store spare light curtain units within controlled storage environments ranging from -25 to +60 °C (-13 to 140 °F).

System Compatibility and Integration

• Fully compatible with standard safety controllers, safety PLCs, and safety relay modules accepting Type 4 OSSD transistor signals.
• Supports muting lamp connections (incandescent 24 VDC 1-5.5 W or LED 10-230 mA) for automated conveyor material handling integration.
• Seamlessly integrates into existing perimeter guarding architectures requiring SIL3 and PLe safety ratings.

Fulfillment, Warranty, and Logistics

• Package Contents: One GL-R24L transmitter unit, one receiver unit, and standard mounting documentation.
• Warranty Coverage: Backed by an exhaustive 12-month replacement and repair warranty covering manufacturing flaws.
• Shipping Services: Rapid worldwide dispatch within 24-48 hours via FedEx, UPS, and DHL.

Target Industrial Applications

• Automated robotic cell perimeter access control and material loading zones.
• Large stamping presses, hydraulic brake formers, and metal fabrication machinery.
• High-speed automated assembly lines and conveyor transfer stations.
• Packaging, palletizing, and material handling sortation systems.

Advanced Diagnostic Architecture

• Built-in error output lines provide immediate transistor-level fault diagnostics for quick troubleshooting by maintenance technicians.
• Comprehensive current protection guards against reverse polarity, output short-circuits, and transient electrical surges.
• Mutual interference reduction technology prevents cross-talk between closely mounted safety barriers in dense plant layouts.

Frequently Asked Questions (FAQ)

What is the primary safety classification of the GL-R24L safety curtain?

The GL-R24L is certified as a Type 4 ESPE / AOPD safety light curtain, meeting SIL3 and PLe (Category 4) safety compliance standards.

How does wire synchronization differ from optical synchronization?

Wire synchronization uses physical hardwired connections between units to optimize response times (7 ms ON-to-OFF), whereas optical synchronization communicates via Channel 0 or Channel A/B infrared beams.

Can I connect external muting lamps directly to this unit?

Yes, the system features a dedicated muting lamp output supporting incandescent lamps (24 VDC, 1 to 5.5 W) or compatible LED lamps ranging from 10 to 230 mA.

What factors should I evaluate when selecting a safety light curtain for high-vibration stamping presses?

Always verify the unit's mechanical vibration and shock resistance ratings (such as 100 m/s2 pulse resistance and rugged aluminum housings), and ensure mounting brackets utilize rubber dampening to prevent optical misalignment over time.

How can I prevent optical cross-talk when installing two light curtains close to each other?

Utilize the built-in mutual interference prevention function by setting distinct Channel A and B optical settings or switching to wire synchronization to isolate transmission loops.

Global PLC Spare HUB's Insight & Field Experience

Deploying safety light curtains like the GL-R24L in heavy automotive stamping facilities often presents challenges regarding oil mist accumulation and severe structural vibration. During a recent press line safety retrofit, our engineering team observed intermittent nuisance trips on a primary barrier. Investigation revealed that heavy cutting fluid mist had coated the polycarbonate front cover, scattering the 870 nm infrared beams, while press vibration slightly shifted an un-damped mounting bracket. By cleaning the lenses with an anti-static optical solution and upgrading to heavy-duty isolation mounts, we restored stable optical coupling across the 36.22" span and achieved flawless long-term safety loop reliability.

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