Allen-Bradley 1791DS-IB4XOW4 Guard I/O Safety Module

Allen-Bradley 1791DS-IB4XOW4 Guard I/O Safety Relay Module

Key Technical Specifications

• Brand: Allen-Bradley
• Model Number: 1791DS-IB4XOW4
• Category: Safety Relay Module
• Product Line: Guard I/O 1791ES & 1791DS Series
• Safety Rating: SIL 3, Category 4 (EN 954-1)
• Number of Inputs: 4 discrete safety inputs (current sinking).
• Input Voltage: On-state: 11V DC minimum; Off-state: 5V DC maximum.
• Input Current: 6 mA typical.
• Safety Relay Outputs: 4 x G7SA-2A2B EN50205 Class A relays.
• Relay Contact Rating: Resistive: 240V AC/2A, 30V DC/2A; Inductive: 240V AC/2A, 24V DC/1A.
• Test Outputs: 4 current sourcing outputs (0.7A rated).
• Operating Voltage: 20.4 to 26.4V DC (24V DC nominal).
• Communications Power: 11 to 25V DC.
• Power Consumption: 110 mA at 24V DC.
• Relay Durability: 5 million operations (mechanical), 100,000 operations (electrical).
• Wire Size: 0.2-2.5 mm² (24-12 AWG) solid; 0.34-1.5 mm² (22-16 AWG) flexible.
• Communication Protocol: DeviceNet with CIP Safety.
• Enclosure Protection: IP64/65/67 ratings available.
• Weight: 1.31 lbs (0.60 kg).

Core Features and Safety Design

• The 1791DS-IB4XOW4 module is designed for constructing SIL 3 compliant safety control networks.
• It integrates four safety relay outputs, eliminating the need for external safety relays.
• The module provides comprehensive status data via LED indicators and DeviceNet messaging.
• Features include a node address switch and a Phoenix connector for DeviceNet network connection.
• It supports monitoring of individual point status, combined status, and output readback.
• The module operates over a Common Industrial Protocol (CIP) Safety network.
• It is suitable for safety applications requiring high reliability and diagnostic capability.

Installation and Environmental Ratings

• Provide a clean 20.4-26.4V DC power supply for the I/O circuits and relays.
• Ensure a separate 11-25V DC supply for the DeviceNet communication interface.
• The module is designed for mounting in enclosures with appropriate environmental protection.
• It operates in a temperature range of 14 to 131°F (-10 to 55°C).
• The module can withstand operating vibration of 5G (57-150Hz) and shock of 10G.
• Follow all local safety standards and use recommended wire types for reliable connections.

Frequently Asked Questions (FAQ)

• Q: What safety level does this module achieve?
  • A: The 1791DS-IB4XOW4 is rated for Safety Integrity Level 3 (SIL 3) and Category 4.
• Q: Does it include built-in safety relays?
  • A: Yes, it integrates four G7SA-2A2B EN50205 Class A safety relay outputs.
• Q: How many safety inputs are available?
  • A: It provides four discrete safety inputs for connecting devices like E-Stops and light curtains.
• Q: What network does it use?
  • A: It communicates via a DeviceNet network using the CIP Safety protocol.
• Q: What is the relay contact rating?
  • A: Contacts are rated for 2A resistive load at 240V AC or 30V DC.
• Q: How quickly do you ship?
  • A: Orders ship from stock within 3-5 business days.
• Q: What is the return policy?
  • A: We accept returns for new, unused modules within 30 days.

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