1791DS-IB8XOB8 Allen-Bradley | SIL 3 Safety Input Output

Allen-Bradley 1791DS-IB8XOB8 CompactBlock Guard Safety I/O Module

Product Overview

The 1791DS-IB8XOB8 is a high-integrity distributed safety module designed by Rockwell Automation for CIP Safety over DeviceNet networks. This module provides a versatile combination of 8 safety sinking inputs and 8 safety sourcing outputs within a single compact block. Engineered to meet the most stringent global safety standards, including SIL 3 and PLe, the 1791DS-IB8XOB8 allows for localized control of safety field devices such as light curtains, emergency stop buttons, and safety contactors. Its integrated architecture reduces the need for multiple I/O blocks, simplifying the safety circuit design while maintaining maximum protection for industrial personnel and machinery.

Technical Specifications

The 1791DS-IB8XOB8 is designed for extreme reliability, featuring an extended operating temperature range and robust diagnostic capabilities.

• Manufacturer: Rockwell Automation / Allen-Bradley

• Model Number: 1791DS-IB8XOB8

• Product Line: Guard I/O (CompactBlock Guard Safety)

• Communication Protocol: DeviceNet (CIP Safety)

• Safety Inputs: 8 Sinking Inputs (DC)

• Safety Outputs: 8 Sourcing Outputs (Transistor)

• Test Pulse Outputs: 4 Sourcing Outputs (For field wiring monitoring)

• I/O Power Supply: 20.4–26.4V DC (24V DC nominal)

• Communications Power: 11–25V DC (Supplied via DeviceNet cable)

• Comm Current Consumption: 110 mA @ 24V DC

• Rated Output Current: 0.7 A per point

• Input Voltage Range: 11V DC min (On-state); 5V DC max (Off-state)

• Operating Temperature: -40°C to +70°C (-40°F to +158°F)

• Wiring: Copper (AWG 24–12 Solid; AWG 22–16 Standard flexible)

• Safety Ratings: Up to SIL 3 (IEC 61508), PLe (ISO 13849-1)

• Mounting: 35mm DIN Rail

• Weight: 0.94 lbs (0.43 kg)