NXR-S Simple Logic Safety I/O Blocks

Introduction

Omron Industrial Automation’s NXR-S Simple Logic Safety I/O Blocks are IP67-rated safety remote I/O modules for distributed industrial safety systems. The NXR-S family combines remote safety I/O, built-in logic, and CIP Safety communication in a compact field-level architecture intended to support centralized management while placing I/O closer to safety devices.

A notable feature of the product line is that one NXR-S unit can communicate with multiple originators over CIP Safety, helping simplify safety-network integration where several controllers or network participants need access to safety-related status and control information.

What it does

NXR-S blocks provide safety remote I/O with built-in logic, allowing a unit to handle safety-related I/O functions without relying exclusively on a more centralized architecture. They use CIP Safety for safety communication and are designed for distributed control applications.

The blocks support single-cable connections that carry both power and safety signals for light curtains. This can reduce the number of separate field connections required for these devices. A built-in Web UI is provided for troubleshooting and unit replacement, giving maintenance personnel a direct interface for diagnostic and replacement tasks.

The family has an IP67 ingress-protection rating, supporting installation in industrial locations where protection against dust and water ingress is important. Listed electrical and environmental characteristics include 600 VAC dielectric strength and at least 20 MΩ insulation resistance between isolated circuits, operation from -10°C to +55°C, and installation up to 2,000 m altitude.

Applications

• Distributed safety I/O architectures using CIP Safety communication
• Safety-device connections near machinery or production equipment
• Light-curtain installations using combined power and safety-signal cabling
• Industrial cells requiring remotely located safety I/O with local built-in logic
• Equipment where IP67-rated field-level safety modules are appropriate
• Maintenance workflows that benefit from a built-in web interface for troubleshooting and unit replacement

Design considerations

• Network integration: NXR-S uses CIP Safety and can communicate with multiple originators. System design should account for the required safety-network architecture and participating originators.
• Field installation: The IP67 rating makes the blocks suited to protected field deployment, but enclosure, cable, connector, and installation choices should preserve the required system-level environmental protection.
• Electrical isolation: The specified 600 VAC dielectric strength and 20 MΩ minimum insulation resistance apply between isolated circuits and should be considered when planning wiring and circuit separation.
• Environmental limits: The stated operating range is -10°C to +55°C, with 25% to 85% storage humidity and no condensation. The maximum specified altitude is 2,000 m.
• Safety-system engineering: The supplied information lists IEC 61508 and ISO 13849-1:2023 (4th edition) as applicable safety standards. Final safety-function design and validation remain system-level considerations.

Availability and further information

The source and datasheet links on this page provide further information on the Omron NXR-S Simple Logic Safety I/O Blocks, including detailed technical documentation and product-specific configuration information.