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

1791DS-IB4XOW4 Allen-Bradley DeviceNet Safety CompactBlock Guard I/O

The 1791DS-IB4XOW4 is a high-integrity safety module designed for critical machine guarding applications.
This CompactBlock Guard I/O unit utilizes the DeviceNet safety protocol to achieve Safety Integrity Level 3 (SIL 3) performance.
By combining four sinking safety inputs with four Class A safety relay outputs, the 1791DS-IB4XOW4 provides a distributed control solution that simplifies safety-circuit wiring while maintaining compliance with EN 954-1 Category 4 standards.

Detailed Engineering Parameters

• Manufacturer: Allen-Bradley / Rockwell Automation
• Model Number: 1791DS-IB4XOW4
• Safety Rating: SIL 3 (IEC 61508) and Category 4 (EN 954-1)
• Input Configuration: Four (4) Current-sinking safety inputs
• Input Voltage: 11V DC min (ON-state), 5V DC max (OFF-state)
• Output Configuration: Four (4) G7SA-2A2B EN50205 Class A Safety Relays
• Pulse Test Outputs: Four (4) sourcing outputs at 0.7A for loop monitoring
• Relay Load Rating: 240V AC/2A (Resistive), 24V DC/1A (Inductive)
• Communication: DeviceNet protocol supporting Common Industrial Protocol (CIP) Safety
• Power Requirements: 24V DC nominal (20.4 to 26.4V DC range)
• Durability: 5,000,000 mechanical operations; 100,000 electrical operations min
• Environmental: IP64/65/67 rated enclosure with 10G operating shock resistance

Oiltech Controls’s Insight: Safety Optimization

• The 1791DS-IB4XOW4 is a specialized “Safety-Relay-in-a-Box” solution for distributed architectures.
• Integrated test outputs allow the system to detect short circuits in field wiring automatically.
• The G7SA Class A relays feature forcibly guided contacts, essential for fail-safe monitoring.
• Individual status LEDs significantly reduce “mean time to repair” (MTTR) by isolating channel faults.
• Engineers prefer this model for SIL 3 zones where physical separation of the safety controller is required.
• For bulk pricing or technical mapping, email info@oiltechcontrols.com or message +86 158 8020 0923.

Equipment Compatibility & Deployment

• Compatible with GuardLogix, SmartGuard, and other DeviceNet Safety Master controllers.
• Ideally suited for E-stop circuits, light curtain integration, and safety gate monitoring.
• Supports 0.2 to 2.5 mm² (AWG 24-12) conductors for versatile field termination.
• Node address switches allow for rapid hardware-level addressing without complex software tools.
• Operates reliably in temperature ranges from 14°F to 131°F (-10°C to 55°C).

Global Service & Warranty Standards

• Warranty: 12-month technical functional warranty included as standard.
• Dispatch: Guaranteed professional dispatch within 24-28 hours for all orders.
• Shipping: Worldwide express logistics provided by FedEx, UPS, and DHL.
• Condition: Each 1791DS-IB4XOW4 is inspected for physical integrity and firmware version before shipment.

Professional FAQ & Procurement Guide

• What is the advantage of the G7SA Class A relays in this module?
  These relays use forcibly guided contacts, ensuring that if one contact welds, the other cannot close, maintaining safety integrity.
• Can I use standard DeviceNet cables for the 1791DS-IB4XOW4?
  Yes, but the network must be managed by a Safety-certified Master to achieve SIL 3 ratings.
• What does the “Pulse Test” feature actually do for my safety circuit?
  It sends short signals to inputs to detect “stuck-at-ON” faults or cross-channel shorts in the field wiring.
• Selection Guide: Is the 1791DS-IB4XOW4 better than a standalone safety relay?
  Choose this module if you need to report safety status back to a PLC over a network rather than just hardwiring.
• How do I replace the internal relays if they reach their end of life?
  The G7SA relays on this module are designed to be replaceable, extending the life of the overall Guard I/O block.

Author: Oiltech Controls

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