Product Overview
The Allen-Bradley 1791DS-IB4XOW4 is a DeviceNet Safety CompactBlock Guard I/O Module from the Guard I/O 1791ES and 1791DS product line. This safety module is designed to construct a safety-control network system rated up to Safety Integrity Level (SIL) 3 and Safety Category 4 of EN 954-1. It provides four safety inputs and four relay outputs, making it a critical component for machine safety applications where reliable I/O control is essential.
Technical Specifications Breakdown
Key parameters for the 1791DS-IB4XOW4 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Allen Bradley |
| Part Number | 1791DS-IB4XOW4 |
| Product Type | Safety Module |
| Communication Protocol | DeviceNet |
| Operating Voltage Range | 20.4-26.4V dc |
| Power Consumption | 110 mA @ 24V dc |
| Number of Inputs | 4 |
| Input Type | Single-Channel |
| On-State Input Voltage | 11V dc min. |
| Off-State Input Voltage | 5V dc max. |
| Input Current | 6 mA |
| Number of Outputs | 4 |
| Output Type | Current sourcing |
| Safety Output | G7SA-2A2B EN50205 Class A |
| Rated Output Current | 0.7 A |
| Resistive Load | 240V AC, 2 A 30V DC, 2 A |
| Inductive Load | 240V AC, 2 A (cos Θ = 0.3); 24V DC, 1 A |
| Minimum Permissible Load | 5V DC, 1 mA |
| Relay Durability, Mechanical | 5,000,000 operations min |
| Relay Durability, Electrical | 100,000 operations min |
| SIL Rating | SIL 3 |
| Weight | 1.31 lbs (0.60 kg) |
Industry Applications
The four safety inputs can monitor emergency stop buttons or safety gates, while the four relay outputs control contactors or actuators. The DeviceNet communication protocol allows seamless integration into existing industrial networks, enabling centralized safety monitoring and control. By using the 1791DS-IB4XOW4, engineers can reduce wiring complexity and improve system reliability in safety-critical processes.
Installation & Setup Guidance
Mount the module securely in a suitable enclosure. Connect the DeviceNet communication cable to the Phoenix communication connector. Wire safety inputs as single-channel devices using 0.2…2.5 mm² (AWG 24…12) solid wire or 0.34…1.5 mm² (AWG 22…16) standard flexible wire with insulation-covered bar terminals. Apply I/O power within 20.4…26.4V dc and communication power within 11…25V dc. Set the node address switch for proper network identification. Verify that the central safety controller is configured to process I/O and status data from the module.
Maintenance & Reliability
Periodically inspect the module for physical damage or contamination. Check LED status indicators for normal operation. The relay outputs have a mechanical durability of 5,000,000 operations and electrical durability of 100,000 operations under rated loads. Ensure the operating environment stays within acceptable limits to maximize service life.
Compatibility & Integration
The 1791DS-IB4XOW4 uses DeviceNet communication protocol and supports Common Industrial Protocol (CIP). It exchanges data over Remote I/O architecture with a central safety controller on the same DeviceNet network. The module provides I/O data and status data, including Individual Point Input Status, Combined Input Status, Individual Point Output Status, Combined Output Status, Individual Test Output Status, and Individual Output Readback.
Selection Guide & Purchasing Advice
When evaluating the 1791DS-IB4XOW4 for your safety network, consider the number of safety inputs and outputs required, the need for SIL 3 certification, and DeviceNet compatibility. This module is a robust choice for machine safety applications. For purchasing, AutoDCSTech offers this module with availability checks. Please verify current lifecycle status and availability with AutoDCSTech before ordering.
Availability & Condition at AutoDCSTech
| Part Number | 1791DS-IB4XOW4 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
