Allen Bradley 1756-IB16 Digital Input Module

The AB 1756-IB16 is a high-density digital input module from the ControlLogix series, engineered for reliable signal acquisition in industrial automation systems. This module supports 16 individually isolated sinking inputs at 12/24V DC nominal and is designed for compatibility with a wide range of field devices and logic controllers.

With a compact 38.1 mm width and robust 20-pin plug-in terminal interface, the 1756-IB16 is ideal for modern control panels where space savings, performance, and scalability are essential. It integrates seamlessly with ControlLogix chassis-based systems for real-time digital signal processing in high-speed applications.

Technical Specifications

Model: 1756IB16
Series: ControlLogix
Type: Digital Input Module
Input Channels: 16 digital inputs
Input Type: Sink (common negative)
Nominal Input Voltage: 12/24V DC
Input Voltage Range: 10–31V DC
Connector Type: 20-pin
Application: Discrete signal input for automation and control systems

Electrical Specifications

Input Voltage: 10–31 V DC
Nominal Voltage: 24 V DC
Input Current (Signal ON): 10 mA
Off-State Voltage (Max): 5 V DC
Signal Delay (ON to OFF): 0.29…18 ms (configurable)
Isolation Voltage: 250V (continuous, basic insulation)
Short-Circuit Protection: Not available
Input Type: Digital (non-configurable)
Overvoltage Protection: Internal clamp circuitry

Mechanical Specifications

Width: 38.1 mm
Height: 300 mm
Depth: 111.25 mm
Mounting Type: Chassis-mounted (ControlLogix rack)
Connector Type: Plug-in (20-pin)
Module Keying: Electronic and mechanical keying supported
Weight: Approx. 0.3 kg
Installation Orientation: Any

Environmental Specifications

Operating Temperature: 0…60 °C
Storage Temperature: –40…85 °C
Relative Humidity: 5% to 95% non-condensing
Shock Resistance: 30 g, 11 ms (IEC 60068-2-27)
Vibration Resistance: 2 g, 10–500 Hz (IEC 60068-2-6)
Altitude Rating: Up to 2000 m
Certifications: CE, UL, cULus, RoHS
Pollution Degree: 2

Compliance & Communication

System Integration: ControlLogix chassis
Backplane Communication: ControlBus
Diagnostics: Channel-level fault detection
Status Indicators: LED per channel (input status)
Configuration Software: Studio 5000 Logix Designer
Protocol Support: Internal control network (not fieldbus directly)

Key Features & Benefits

✅ 16 Sinking Inputs – Supports discrete DC input signals from field devices with common negative wiring

✅ Compact Chassis Design – Saves rack space with only 38.1 mm module width

✅ Fast Input Response Time – Signal delay configurable from 0.29 to 18 ms

✅ Robust 20-Pin Plug-In Connection – Ensures secure and maintenance-friendly wiring

✅ Studio 5000 Compatible – Simplifies configuration and diagnostics in Allen Bradley environments

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