Overview
The Allen-Bradley 1791DS-IB16 is a CompactBlock Guard I/O DeviceNet safety module engineered for safety-related applications requiring high integrity signal processing. This 16-point digital safety input module provides isolated inputs designed for 24V DC signals from emergency stop buttons, safety switches, light curtains, and other safety-critical devices. With built-in diagnostics and screw terminal connections, the 1791DS-IB16 simplifies integration into safety-managed automation systems while maintaining strict compliance with functional safety standards.
Key Features
- 16 isolated single-channel safety inputs for reliable signal detection and processing
- 24V DC nominal operating voltage (19.2–28.8V DC range) with DeviceNet power (11–25V DC)
- SIL 3 certification supporting ISO 13849-1 and IEC 61508 safety standards
- 16 configurable pulse-test outputs for diagnostics and self-testing
- Password-protected configuration lockable for security and audit compliance
- DIN rail mounting with compact form factor for space-constrained enclosures
Technical Specifications
- Input Count: 16 safety channels (single-channel configuration)
- Input Current (Off-State): 1.3 mA nominal
- Input Current (On-State): 3.3 mA nominal
- Input Voltage (Off-State): Up to 5V DC
- Input Voltage (On-State): 11V DC minimum
- Output Current: 0.7A per channel
- Output Leakage Current: 0.1 mA maximum
- Output Residual Voltage: 1.2V maximum
- Operating Voltage: 19.2–28.8V DC (24V DC nominal, ±20%)
- DeviceNet Power Voltage: 11–25V DC
- Test Output Current (Muted Lamp Mode): 5–25 mA
- Power Supply: 24V DC via internal backplane
- Mounting Type: DIN rail
- Connector Type: Screw terminal
- Weight: 0.5 kg
- Operating Temperature: 0–60°C
- Certifications: UL, CE, CUL, KC, RCM, TUV, UKCA
- Safety Standards: ISO 13849-1, IEC 61508 (SIL 3)
- Firmware Version: 1.5.3 (latest available)
Typical Applications
- Emergency stop systems and safety interlocks in manufacturing equipment
- Protective guarding and light curtain monitoring circuits
- Material handling and packaging line safety control
- Energy and petrochemical facility safety-critical networks
- Machinery motion control with safety-rated signal conditioning
- SIL 3–capable control systems requiring redundant monitoring
Compatibility & Replacements
The 1791DS-IB16 integrates seamlessly with Allen-Bradley ControlLogix and CompactLogix PACs via DeviceNet gateway modules. EDS (Electronic Data Sheet) files and configuration tools are available from Rockwell Automation for network setup and device diagnostics. Firmware version 1.5.3 is current; earlier versions may be updated via authorized Rockwell channels. Related Guard I/O modules in the 1791 family (such as the 1791DS-IB12 with 12 inputs) provide alternative channel counts for different application scales. Always verify firmware compatibility and obtain relevant AOP (Add-On Profiles) before commissioning safety-critical systems.
