Product Overview
The Allen-Bradley 1791DS-IB16 is a high-performance Guard I/O safety input module from Rockwell Automation, specifically designed for safety-critical applications requiring reliable monitoring of up to 16 single-channel safety devices on DeviceNet networks. This CompactBlock module communicates using the CIP Safety protocol over DeviceNet, ensuring deterministic and fail-safe data exchange with safety controllers such as GuardLogix®, GuardPLC™ 1600 and 1800, and SmartGuard™ 600 systems . The 1791DS-IB16 features 16 current sinking safety inputs and an additional 16 current sourcing pulse test outputs, providing comprehensive diagnostic capabilities for field wiring and connected safety devices. With TÜV certification confirming its suitability for applications up to Safety Integrity Level 3 (SIL 3) per IEC 61508, Safety Category 4 per EN 954-1, and Performance Level e per EN ISO 13849-1, the 1791DS-IB16 delivers the highest levels of functional safety certification . The Allen-Bradley 1791DS-IB16 is ideally suited for highly distributed I/O architectures where compact form factor, ease of installation, and point-level diagnostics are paramount. As part of the Guard I/O family, this module supports both standard and safety control, enabling unused safety inputs to be configured as standard solid-state outputs, offering exceptional application flexibility . The 1791DS-IB16 incorporates built-in self-diagnostics, hardware testing, and field circuit testing functions without requiring additional programming, detecting failures at both the I/O and field device levels to enhance operator protection and reduce machine downtime .
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1791DS-IB16 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Type | Safety Input Module |
| Product Series | Guard I/O 1791DS (DeviceNet) |
| Communication Protocol | DeviceNet with CIP Safety |
| Number of Safety Inputs | 16 (Single-Channel, Current Sinking) |
| Number of Pulse Test Outputs | 16 (Current Sourcing, 0.7 A per point) |
| Operating Voltage Range | 19.2 – 28.8 V DC (24V DC nominal, -20% / +20%) |
| Power Consumption | 85 mA @ 24V DC |
| DeviceNet Power Voltage Range | 11 – 25 V DC |
| On-State Input Voltage (Min.) | 11 V DC |
| Off-State Input Voltage (Max.) | 5 V DC |
| On-State Input Current (Min.) | 3.3 mA |
| Input Delay Time (OFF to ON / ON to OFF) | 16.2 ms max. |
| Pulse Test Output Current | 0.7 A per point |
| Operating Temperature | -20 °C to +60 °C (-4 °F to +140 °F) |
| Storage Temperature | -40 °C to +85 °C (-40 °F to +185 °F) |
| Enclosure Rating | IP20 |
| Mounting | DIN Rail |
| Agency Approvals | TÜV (SIL 3 / Cat. 4 / PLe), CE, KC, ODVA, UL Listed, UKCA, RCM |
Main Features and Advantages
TÜV Certified Functional Safety: The Allen-Bradley 1791DS-IB16 is TÜV certified for use in safety applications up to the highest performance levels: SIL 3 per IEC 61508, Safety Category 4 per EN 954-1, and Performance Level e (PLe) per EN ISO 13849-1 . This certification provides assurance that the 1791DS-IB16 meets rigorous international safety standards, making it suitable for critical machine safeguarding and process protection applications.
Distributed Safety I/O Architecture: Designed for highly distributed control architectures, the 1791DS-IB16 enables placement of safety I/O blocks close to field devices, minimizing wiring runs and simplifying system design . The module supports connection of both single-channel and dual-channel safety devices, offering versatility for various safety circuit configurations . The 1791DS-IB16 communicates seamlessly with GuardLogix, GuardPLC, and SmartGuard controllers using the CIP Safety protocol over DeviceNet .
Built-In Diagnostic Capabilities: The 1791DS-IB16 features point-level diagnostics with LED status indicators for each input and output circuit, enabling rapid identification of faults and reducing machine downtime . The module automatically detects short circuits, wire breaks, and discrepancies in dual-channel circuitry without additional programming . The 16 pulse test outputs on the 1791DS-IB16 provide dynamic testing of safety input wiring, verifying that field devices and cabling remain intact.
Flexible Configuration and Ease of Use: The 1791DS-IB16 supports configuration through RSLogix™ 5000 or RSNetWorx™ for DeviceNet software . The module features electronic short circuit protection and overcurrent detection on outputs, safeguarding both the module and connected field devices . Unused safety inputs on the 1791DS-IB16 can be repurposed as standard solid-state outputs, providing additional control capability without extra hardware. The 1791DS-IB16 supports Removal and Insertion Under Power (RIUP), allowing module replacement without system shutdown .
