Overview
Allen-Bradley 1791DS-IB8XOB8 is a Guard I/O DeviceNet Safety CompactBlock module designed for safety-critical industrial automation and machine protection. This sealed 16-point digital I/O module combines 8 safety-rated sinking inputs, 8 solid-state sourcing safety outputs, and 4 sourcing test outputs on a single DeviceNet safety network interface. Rated for SIL 3 (IEC 61508) and Safety Category 4 (EN 954-1), it provides certified protection for emergency stop circuits, safety interlocks, safety mats, and protective device monitoring.
Key Features
- Eight (8) safety-rated sinking inputs with 6 mA input current
- Eight (8) solid-state sourcing safety outputs with 0.5 A rated current
- Four (4) test outputs with 0.7 A rated current for fault detection
- DeviceNet Safety communication protocol for certified data exchange
- SIL 3 / Category 4 certified per IEC 61508 and EN 954-1
- IP20 open-style enclosure with individual status indicators
- Self-diagnostic functions and configuration lock feature
- 24 VDC nominal supply voltage
Technical Specifications
- Safety Inputs: 8 channels, current sinking, 6 mA rated input current, 11 VDC minimum on-state voltage
- Safety Outputs: 8 channels, current sourcing, 0.5 A rated output current, 1.2 V maximum residual voltage
- Test Outputs: 4 channels, current sourcing, 0.7 A rated output current, 1.2 V maximum residual voltage
- Supply Voltage: 24 VDC nominal
- Communication: DeviceNet Safety
- Safety Rating: SIL 3 (IEC 61508), Safety Category 4 (EN 954-1)
- Enclosure Rating: IP20
- Operating Temperature: -10 to +55 °C
- Dimensions: 4 × 4 × 8 inches (typical)
- Series: Guard I/O CompactBlock
- Network Protocol: DeviceNet Safety
Typical Applications
The Allen-Bradley 1791DS-IB8XOB8 is ideal for machinery and systems requiring certified functional safety up to SIL 3:
- Robotic cell safety systems and collaborative robot interlocks
- Press and injection molding machine safety circuits
- Assembly line emergency stop networks
- Safety interlock and guard door monitoring
- Conveyor and material handling protective device control
- Distributed safety architectures on DeviceNet networks
Compatibility & Replacements
Compatible With
- Allen-Bradley ControlLogix, CompactLogix, and other Rockwell Automation controllers with DeviceNet Safety support
- DeviceNet Safety networks and gateways
- Rockwell Studio 5000 and RSLinx software platforms
- Safety-rated emergency stop systems and interlock networks
- IP20 open-environment industrial applications
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1791DS-IB8XOB8 is a unique safety module; direct replacement models should be confirmed against your specific application requirements and network architecture.
Works With
- DeviceNet Safety communication protocol
- Rockwell Automation Studio 5000 programming environment
- RSLinx Classic and RSLinx Enterprise gateway software
- Allen-Bradley CompactBlock I/O ecosystem
- IEC 61508 and EN 954-1 certified safety systems
