Overview
The Allen-Bradley 1794-IB16 is a 16-point 24VDC sinking input module designed for Rockwell Automation FLEX I/O distributed I/O systems. Manufactured by Allen Bradley, the 1794-IB16 serves as a digital input module within the Flex I/O 1794 series and accommodates 16 sinking current inputs, suitable for integration into various control systems. The module uses a compact plug-in form factor that installs directly into FLEX I/O terminal bases without requiring panel cutouts or external wiring. Modules can be inserted or removed under power since the I/O module does not have any direct wiring, saving time and removing system restarting inefficiency.
Key Features
- 16 Current-Sinking Inputs: Each input point accepts PNP sensors and solid-state switches
- Wide Operating Range: Operates efficiently under varying voltage levels, with minimum operational voltage starting at 10 volts DC, nominal voltage at 24 volts DC, and maximum operational voltage reaching 31.2 volts DC
- Fast Response: Manages on-state currents from a minimum of 2 mA, with nominal on-state current of 8 mA, up to maximum of 12 mA
- Low Off-State Power: Maintains maximum off-state voltage of 5 volts DC with off-state current limitation of 1.5 mA
- High Isolation Rating: Continuous isolation voltage rating of 50 volts with basic insulation
- Modular Compatibility: Up to eight (8) 1794-IB16 modules may be installed in a single Flex I/O rack
Technical Specifications
- Input Type: Current-sinking (accepts PNP sourcing sensors)
- Number of Points: 16 digital inputs
- Nominal Voltage: 24V DC
- Operating Voltage Range: 10–31.2V DC
- On-State Current: 2–12 mA (typical 8 mA)
- Off-State Current: Maximum 1.5 mA
- Input Impedance: 4.6 kiloohms
- Power Dissipation: 6.1W at 31.2V DC
- Isolation Voltage: 50V DC continuous
- Compatible Terminal Bases: 1794-TB3 and 1794-TB3S
- Standards Compliance: SIL2 rated
Typical Applications
The 1794-IB16 is ideal for distributed I/O applications requiring remote sensor monitoring and digital signal acquisition. Common uses include machine control, process automation, motor interlocks, limit-switch sensing, emergency-stop circuits, and general discrete input monitoring in manufacturing environments. The module’s hot-swap capability and flexibility make it suitable for rapid system commissioning, troubleshooting, and field upgrades without system downtime.
Compatibility & Replacements
Compatible With
- Rockwell Automation FLEX I/O distributed I/O platforms
- All available Flex I/O communication adapters
- Terminal base units: 1794-TB3, 1794-TB3S
- CompactLogix, ControlLogix, and other Rockwell controllers via FLEX I/O gateways
- Studio 5000 Logix Designer (current versions)
- EtherNet/IP networks (via optional communication adapters)
Replaces / Drop-In Replacement For
- 1794-IB16 Series A (earlier firmware revisions)
- Other legacy distributed I/O systems when integrated with proper adapters
Works With
- Studio 5000 Logix Designer programming software
- FLEX I/O Series communication adapters (1794-ACNR, 1794-AENT, 1794-ARNE)
- EtherNet/IP and serial communication protocols via gateway adapters
- PNP digital sensors and solid-state switches
