Overview
The Allen-Bradley 1791DS-IB8XOB8 is a CompactBlock Guard I/O safety module that integrates distributed safety I/O for machine and process automation. This module provides distributed I/O advantages for safety systems and works with safety controllers communicating on DeviceNet networks using CIP Safety. The module operates at 20.4 to 26.4 Volts DC I/O power supply voltage with nominal 24 Volts DC and 110-mA current consumption.
Key Features
- Eight safety inputs, eight solid-state safety outputs, and four test outputs
- IP20 enclosure rating suitable for SIL3 applications
- Safety inputs are current sinking type with 6 mA input current per point
- Safety outputs feature 0.5 Amps rated output current with 0.1 mA maximum leakage
- Optimized to work with GuardPLC, GuardLogix, and SmartGuard controllers
- DeviceNet communication protocol for safety-rated networks
Technical Specifications
Detailed performance parameters for design integration:
- Input specifications: 6 mA per point, 11 Volts DC on-state minimum, 5 Volts DC maximum off-state
- Test output specifications: 0.7 Amps rated current, 0.1 mA maximum leakage, 1.2 Volts maximum residual
- Operating temperature range: -10 to 55°C (14 to 131°F)
- Dimensions: 80 mm x 196 mm x 77 mm; Weight: 420 g (0.93 lbs)
Typical Applications
Safety-critical control tasks in industrial environments:
- Machine safety interlock control on assembly lines
- Emergency stop (E-stop) logic circuits
- Guard gate and light curtain monitoring
- Process safety valves and motor contactor control
- Distributed safety I/O for mobile and modular machinery
Compatibility & Replacements
This product reached end-of-life on December 31, 2023, and Rockwell Automation lists it as discontinued with an engineering replacement category. Used units of the 1791DS-IB8XOB8 remain valuable for system maintenance and retrofit applications. The module integrates with GuardPLC, GuardLogix, and SmartGuard safety controllers over DeviceNet. For new applications, consult Rockwell Automation or authorized distributors for current safety I/O alternatives. Current units function identically to original equipment and require standard DeviceNet cabling and CIP Safety protocol configuration.
