Allen Bradley 1791DS-IB8XOB8 DeviceNet Safety CompactBlock Input Module

Product Introduction

The Allen-Bradley 1791DS-IB8XOB8 DeviceNet Safety CompactBlock Input Module is a safety-rated distributed I/O solution designed for applications requiring both standard control and functional safety integration. As part of the CompactBlock Guard I/O family, it combines safety inputs, safety outputs, and test outputs into a single rugged unit, enabling efficient implementation of safety circuits at the machine level.

This module features 8 single-channel sinking safety inputs, 8 solid-state sourcing safety outputs, and 4 sourcing test outputs, allowing it to monitor and control safety devices such as emergency stop buttons, safety interlocks, and light curtains. With integrated DeviceNet Safety communication, it supports reliable data exchange between safety controllers and field devices without requiring additional safety relays.

Its wide operating temperature range and robust industrial design make it suitable for harsh environments, while its compact structure simplifies installation and reduces panel wiring in safety-critical systems.

Product Specifications

Applications

• Machine safety systems – Designed for integration of emergency stop circuits, safety gates, and interlock switches in automated machinery

• Packaging and material handling – Ensures safe operation of conveyors and robotic handling systems where personnel interaction is required

• Automotive production lines – Widely used in safety zones requiring reliable distributed safety I/O control

• Process industries – Suitable for safety monitoring and shutdown control in hazardous environments

• Robotics and assembly systems – Provides safety-rated signal processing for collaborative and high-speed robotic applications

Advantages

• Integrated safety I/O design – Combines safety inputs, outputs, and test outputs in one module, reducing the need for additional safety components

• DeviceNet Safety communication – Enables certified safety data transmission over a standard network, simplifying system architecture

• High reliability solid-state outputs – Provides fast response and long-term operational stability

• Wide temperature tolerance – Suitable for extreme industrial environments, from -40°C to 70°C

• Simplified wiring and installation – Reduces panel complexity and improves commissioning efficiency

• Enhanced diagnostics capability – Supports fault detection and system status monitoring through the network

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