FLEX I/O Dual Channel Adapter | 1794-ACNR Allen-Bradley

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Allen-Bradley 1794-ACNR FLEX I/O ControlNet Redundant Media Adapter

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 1794-ACNR is designed for high-availability distributed I/O systems, ensuring continuous data flow even in the event of a media fault.

• Manufacturer: Rockwell Automation / Allen-Bradley

• Model Number: 1794-ACNR

• Series: FLEX I/O

• Communication Protocol: ControlNet

• Data Rate: 5 Mbps

• Network Topology: Trunkline-dropline, Star, or Ring (with repeaters)

• Media Redundancy: Dual ControlNet BNC connections (Channel A and Channel B)

• I/O Capacity: Supports up to 8 FLEX I/O modules per adapter

• Input Voltage: 24V DC nominal

• Input Voltage Range: 19.2V to 31.2V DC (includes 5% AC ripple)

• Flexbus Output Current: 640 mA maximum

• Power Dissipation: 4.6 W maximum @ 19.2V DC

• Thermal Dissipation: 15.7 BTU/hr @ 19.2V DC

• Inrush Current: 23 A for 2 ms

• Isolation Voltage: 850V DC continuous (between user power and Flexbus)

• Operating Temperature: 0°C to +60°C (32°F to 140°F)

• Weight: 0.79 lbs (0.36 kg)

• Dimensions: 87 x 68 x 94 mm (3.4 x 2.7 x 3.7 in.)