Overview
The Allen-Bradley 1791D-16B0X is a 16-sinking input expansion module from Rockwell Automation’s CompactBlock I/O product family. This discrete input device integrates DeviceNet communication, enabling reliable real-time data exchange between field inputs and programmable controllers in distributed automation systems. The module is designed for industrial environments where modular, space-efficient I/O distribution is required.
Key Features
- 16 discrete sinking inputs organized in two groups of eight channels
- Integrated DeviceNet communication terminal with configurable Polled, Change of State (CoS), and Cyclic I/O exchange modes
- 24VDC input signal voltage (0–30V nominal range, 10–30V operating)
- DIN rail mounting with compact form factor and IP20 enclosure rating
- Built-in LED status indicators for module/network and I/O status monitoring
Technical Specifications
- Input Voltage: 0–30VDC (operating 10–30VDC)
- Input Points: 16 discrete sinking inputs
- On-State Current: 11 mA @ 30VDC; 2 mA @ 10VDC
- Off-State Current: 1.5 mA @ 5VDC
- Communication Protocol: DeviceNet (125 Kbps, 250 Kbps, 500 Kbps)
- DeviceNet Distance (Thick Cable): 125 Kbps @ 500m, 250 Kbps @ 200m, 500 Kbps @ 100m
- DeviceNet Distance (Flat Cable): 125 Kbps @ 420m, 250 Kbps @ 200m, 500 Kbps @ 75m
- Wire Gauge: 14 AWG (2.0 mm²) stranded maximum
- Mounting: DIN rail
- Enclosure Rating: IP20
- Dimensions: 7.0″ W × 6.0″ H × 7.0″ D
- Weight: 2.0 lbs
- Series: CompactBlock I/O (Series C/D)
Typical Applications
- Distributed discrete input I/O stations for assembly and packaging lines
- Remote sensor monitoring in process control systems
- Manufacturing automation and motion control systems
- Building and infrastructure automation networks
- Industrial machine tool and equipment control
Compatibility & Replacements
The 1791D-16B0X is compatible with Allen-Bradley PLC-5, SLC 500, CompactLogix, ControlLogix, and SoftLogix programmable controllers equipped with DeviceNet scanner modules (such as 1756-DNB or equivalent). This expansion module pairs with CompactBlock base modules or functions as a standalone distributed I/O node on a DeviceNet network. Rockwell Automation documentation (Publication 1791D-IN003A-EN-P) confirms compatibility across the 1791D product line for modular input/output configurations. Always verify your controller’s DeviceNet scanner firmware revision to ensure optimal performance.
