Overview
The Allen-Bradley 1756-IB16 is a ControlLogix 16-point DC digital input module designed for industrial automation and process control applications. This module provides sub-millisecond input detection and supports current-sinking logic, accepting input voltage levels from 10–31V DC with built-in isolation per input point. The module mounts directly into the 1756 ControlLogix chassis backplane and integrates seamlessly with Studio 5000 Logix Designer software.
Key Features
- 16 individually isolated digital inputs – Each point operates independently with galvanic isolation, reducing crosstalk and noise sensitivity
- Flexible input voltage range – Accepts 10–31V DC for compatibility with multiple sensor and switch configurations
- Low current consumption – Module draws 2 mA at 24V DC, minimizing backplane load
- LED status indicators – Input and communication status lights plus module health display for quick diagnostics
- Fast response time – Input detection between 0.29–18 milliseconds depending on signal characteristics
- Standard certifications – UL, CE, CSA, NRTL, and additional global safety markings ensure regulatory compliance
Technical Specifications
- Number of Inputs: 16 (individually isolated)
- Input Voltage Range: 10–31V DC
- Input Type: Current sinking
- Module Current Draw: 2 mA @ 24V DC; 295 mA @ 5.1V DC backplane supply
- Response Time: 0.29–18 milliseconds
- Backplane Power: 1.5W typical
- Maximum Power Dissipation: 5.5W @ 60°C
- Thermal Dissipation: 17.22 BTU/hr
- Operating Temperature: 0–60°C (storage –20–70°C)
- Mounting: Chassis mount (1756 backplane)
- Connection Type: Screw/spring clamp terminal blocks
- Display: Input/communication status and module health LEDs
- Enclosure: Open style (no protective cover)
Typical Applications
The 1756-IB16 is widely used in manufacturing, process industries, and machine automation for:
- Emergency stop (E-stop) and safety interlock monitoring
- Sensor and proximity switch input consolidation
- Limit switch and pressure-switch acquisition
- Discrete alarm and status signal capture
- Multi-machine coordination and supervisory control systems
Compatibility & Replacements
Compatible With
- 1756 ControlLogix chassis (5570, 5571, 5572, 5573, 5574, 5575, 5576, 5580)
- Studio 5000 Logix Designer (all current versions)
- CompactLogix and GuardLogix systems via expansion racks
- EtherNet/IP and other Allen-Bradley industrial network protocols
- Rockwell Automation Integrated Architecture platforms
Replaces / Drop-In Replacement For
The 1756-IB16 is a direct replacement for earlier Series A and B revisions of the same module. Verify firmware compatibility with your system integrator before ordering if upgrading from older ControlLogix generations.
Works With
- Studio 5000 Logix Designer programming software
- FactoryTalk View HMI and operator interface products
- CompactLogix, GuardLogix, and SoftLogix controllers
- EtherNet/IP and ControlNet communication modules
- Rockwell Automation Logix Platform ecosystem
