Allen-Bradley 1756-IB16D ControlLogix 16-Point 10–30V DC Diagnostic Input Module

Overview

The Allen-Bradley 1756-IB16D is a 16-point diagnostic digital input module designed for the ControlLogix platform. It provides real-time status monitoring and fault detection for DC input signals within a 10–30V DC operating range. Each channel features diagnostic capability for detecting open-wire, short-circuit, and load anomalies, enabling predictive maintenance and minimizing downtime in industrial automation systems.

Technical Specifications

• Model / Part Number: 1756-IB16D

• Brand: Allen-Bradley

• Manufacturer: Rockwell Automation

• Product Line: ControlLogix

• Product Type: Diagnostic Digital DC Input Module

• Number of Inputs: 16 channels (individually diagnostic)

• Input Type: DC sink

• Nominal Input Voltage: 12–24V DC

• Operating Voltage Range: 10–30V DC

• Input Delay Time: 4 ms hardware delay + user-selectable filter

• Diagnostic Capabilities: Open-wire, no-load, and short-circuit detection

• Backplane Current (5V DC): 150 mA

• Power Dissipation (max): 5.8 W @ 60°C (140°F)

• Isolation Voltage: 250V continuous, input-to-backplane and channel-to-channel isolation

• Compatible Terminal Blocks: 1756-TBCH or 1756-TBS6H removable terminal blocks

• Module Keying: Electronic, software configurable

• Enclosure Type: Open-style (for ControlLogix chassis mounting)

• Operating Temperature: 0°C to 60°C (32°F to 140°F)

• Storage Temperature: -40°C to +85°C (-40°F to +185°F)

• Humidity: 5–95% non-condensing

• Shock Rating: 30 g operating, 50 g non-operating

• Vibration: 10–500 Hz, 2 g peak

Key Features

• Integrated diagnostics for improved fault detection and maintenance efficiency

• 16 individually monitored inputs with time-stamped event tracking

• Compatible with ControlLogix chassis for easy system integration

• User-configurable input filters to optimize performance in noisy environments

• Robust isolation for reliable operation in industrial conditions

Applications

• Factory automation and production line control

• Input signal monitoring for DC sensors and limit switches

• Predictive maintenance and condition monitoring systems

• Control panels and distributed I/O architectures

FAQs

Q1: What makes the 1756-IB16D different from standard input modules?
The 1756-IB16D offers built-in diagnostics such as open-wire and short-circuit detection, providing advanced fault analysis compared to standard DC input modules.

Q2: Which removable terminal blocks are compatible with this module?
It supports the 1756-TBCH (36-position cage clamp) and 1756-TBS6H (36-position spring clamp) terminal blocks.

Q3: Can the module operate in high-temperature environments?
Yes. It operates reliably up to 60°C (140°F), suitable for industrial control panels and enclosures.