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

FAQ

1. What type of safety inputs are supported?
   The module supports sinking, single-channel safety inputs typically used for devices like emergency stops and safety switches.

2. Are the outputs safety-rated?
   Yes, all 8 outputs are solid-state sourcing safety outputs designed for safety-critical control.

3. What are test outputs used for?
   Test outputs are used for monitoring input circuits and detecting wiring faults such as shorts or cross faults.

4. Can this module replace traditional safety relays?
   Yes, in many applications it can replace safety relays by integrating safety logic within a networked system.

5. How does DeviceNet Safety improve system design?
   It allows both standard and safety data to be transmitted over the same network with certified integrity.

6. What type of loads can the outputs control?
   The outputs can drive safety contactors, relays, and actuators within the rated current limits.

7. Is redundancy required for safety inputs?
   This model supports single-channel inputs, but system design must follow safety standards for redundancy if required.

8. How is fault detection handled?
   The module provides diagnostic feedback and can detect wiring faults through test pulse monitoring.

9. Can the module operate in harsh environments?
   Yes, it is designed to operate reliably in extreme temperatures and industrial conditions.

10. What controllers are compatible with this module?
    It is compatible with safety PLCs and controllers that support DeviceNet Safety communication.

Related Models

---

Popular Models

Excellent PLC Co., Ltd. has a large number of brand new and original PLC and DCS spare parts, with more than 60 cooperative countries. All products are guaranteed for 1 year and delivered to you by high-quality express. We are committed to using the best products and the most favorable prices to meet the needs and friendship of our customers. We have won the trust of thousands of customers, including these excellent customers.

As for the delivery time, when we receive your order requirements, we will arrange for warehouse personnel to test and verify the products. After you place the order, we will send it to you within 24 hours.