Product Introduction
Industrial automation systems often suffer from electrical noise and ground loop issues that can cause false readings or equipment damage. The Allen-Bradley 1756-IB16I ControlLogix isolated input module addresses these challenges with 16 individually isolated channels, ensuring reliable signal acquisition in harsh environments. This module accepts input voltages from 10 to 30 VDC with a nominal value of 24 VDC, making it ideal for interfacing with pushbuttons, switches, and auxiliary contacts.
Technical Specifications
Key parameters of the Allen-Bradley 1756-IB16I are listed below. These specifications are derived directly from the product datasheet and are critical for system design.
| Parameter |
Specification |
| Input Voltage Range |
10-30 VDC |
| Number of Inputs |
16 individually isolated |
| ON-state Current (min) @ 10 VDC |
2 mA |
| ON-state Current (max) @ 30 VDC |
10 mA |
| Backplane Current @ 5.1 VDC |
100 mA |
| Backplane Current @ 24 VDC |
3 mA |
| Total Backplane Power |
0.58 W |
| Power Dissipation (max) @ 60°C |
5 W |
| Signal Delay OFF→ON (hardware + filter) |
1 ms max + 0/1/2 ms filter |
| Signal Delay ON→OFF (hardware + filter) |
4 ms max + 0/1/2/9/18 ms filter |
| Removable Terminal Blocks |
1756-TBCH, 1756-TBS6H |
Industry Applications
The Allen-Bradley 1756-IB16I excels in applications where signal integrity is paramount. In remote I/O racks located far from the controller, long cable runs are prone to induced noise. The isolated inputs on this module break ground loops and reject common-mode interference, preserving accurate state detection. For example, in a material handling system with limit switches spread across a factory floor, using the 1756-IB16I reduces false triggering and improves uptime. Similarly, in chemical processing plants where sensors must operate near high-voltage equipment, the isolation protects both the module and the control system.
Compatibility & Integration
This module is part of the ControlLogix family and fits into any 1756 chassis except the leftmost slot reserved for processors or communication adapters. It supports local and remote I/O configurations via ControlNet or EtherNet/IP backplane connections (the module itself uses the backplane for power and data). For wiring, use the recommended 1756-TBCH or 1756-TBS6H removable terminal blocks to simplify installation and future replacement. The 1756-IB16I is also compatible with Rockwell Automation’s Studio 5000 environment for easy configuration.
Selection Guide & Purchasing Advice
When selecting the Allen-Bradley 1756-IB16I, verify that your system includes a compatible ControlLogix chassis and the correct RTB. Ensure the input voltage range matches your field devices. For cost-effective procurement from a trusted supplier, consider UBEST Automation. We stock genuine Allen-Bradley 1756-IB16I modules and accessories, ready to ship. Visit ubest101.myshopify.com for more details or to place an order.