Product Overview
The Allen-Bradley 1791DS-IB8XOB8 is a Guard I/O DeviceNet Safety module designed for high-reliability safety applications. It integrates eight safety inputs, eight solid-state safety outputs, and four test outputs into a compact IP20-rated enclosure. This module supports up to SIL 3 requirements, making it suitable for critical safety systems in industrial automation.
Technical Specifications Breakdown
Key parameters for the 1791DS-IB8XOB8 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Allen Bradley |
| Product Type | Guard I/O DeviceNet Safety I/O module |
| Part Number | 1791DS-IB8XOB8 |
| Weight | 0.94 lbs (0.43 kg) |
| No. of Inputs | Eight (8) sinking inputs |
| ON-state Voltage range | 11V dc min |
| No. of safety outputs | Eight (8) Sourcing outputs |
| Rated output current | 0.7 A |
| No. of test outputs | Four (4) Sourcing outputs |
| Communications power supply voltage | 11…25V dc (supplied from communications power supply) |
| Communications current consumption | 110 mA at 24V dc |
| I/O power supply voltage | 20.4…26.4V dc (24V dc, -15…+10%) |
| Operational temperature | -40…70 °C (-40…158 °F) |
Industry Applications
Its DeviceNet protocol enables seamless integration with existing automation networks. The 8 safety inputs can monitor e-stop buttons or light curtains, while the 8 solid-state outputs control actuators like contactors or solenoid valves. The 4 test outputs facilitate periodic self-testing to maintain safety compliance without manual intervention.
Installation & Setup Guidance
Mount the module in a dry, vibration-free environment with adequate airflow. Connect the DeviceNet communications cable to the network, ensuring the communications power supply voltage is within 11…25V dc. Wire the I/O power supply between 20.4…26.4V dc. Use copper wire of 0.2…2.5 mm² (AWG 24…12) for solid connections or 0.34…1.5 mm² (AWG 22…16) for flexible wire with insulation-covered bar terminals. Configure the module using standard DeviceNet configuration tools, setting input and output parameters as per your safety application requirements.
Maintenance & Reliability
Regularly inspect the module for dust accumulation or physical damage. Verify that all connections remain tight and that the enclosure's IP20 rating is maintained. Check the status indicators for any fault codes. Given the module's operational temperature range of -40…70 °C, ensure ambient conditions stay within limits. Periodic functional testing of the test outputs helps confirm ongoing safety integrity.
Compatibility & Integration
The 1791DS-IB8XOB8 uses DeviceNet safety protocol for communication, making it compatible with Allen-Bradley controllers and other DeviceNet master devices. It integrates with Guard I/O 1791ES and 1791DS product lines. The module's sinking inputs and sourcing outputs match standard industrial sensor and actuator wiring. Ensure your network scanner supports DeviceNet safety to fully leverage the module's SIL 3 capabilities.
Selection Guide & Purchasing Advice
When selecting this module, verify your system's power supply and communication requirements. The 1791DS-IB8XOB8 is available at AutoDCSTech, a trusted supplier of industrial automation parts. Contact AutoDCSTech for lifecycle status and availability before ordering. This module is a reliable choice for upgrading safety systems or building new SIL 3-rated installations.
Troubleshooting & Common Issues
If the module fails to communicate, check the DeviceNet cable connections and verify that the communications power supply is within 11…25V dc. If outputs do not activate, confirm that the I/O power supply is between 20.4…26.4V dc and that the safety inputs are in the correct state. Use the integrated I/O status data to diagnose individual point issues. For persistent faults, consult the module's documentation or contact AutoDCSTech support.
Availability & Condition at AutoDCSTech
| Part Number | 1791DS-IB8XOB8 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
