The Allen-Bradley 1756 ControlLogix I/O module series is a line of digital, analog, and specialty input/output interface cards designed for localized machinery monitoring, process instrumentation loops, and distributed field device control. Whether you are replacing a failed legacy 1756-IB16 digital card or sourcing a complete current-generation 1756-IF16 differential analog module, our sales team can help you identify the correct voltage range, channel density, and signal configuration for your installation.
We are not authorized by Allen-Bradley. All products come with a one year warranty.
Allen-Bradley 1756 ControlLogix I/O Module Guide
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ControlLogix I/O cards bridge the processing backplane to physical field sensors and actuators. Use this category overview to identify the proper hardware class for your electrical loops.
| Module Class | Features / Industrial Role | Common Catalog Codes |
|---|---|---|
| Digital Inputs | Interfaces with discrete field devices such as pushbuttons, limit switches, and proximity sensors. Available in high-density and isolated options. | 1756-IB16, 1756-IB32, 1756-IA16 |
| Digital Outputs | Drives discrete plant field loads including solenoid valves, motor starter coils, and indicator lights. Features electronic fusing options. | 1756-OB16E, 1756-OB32, 1756-OW16I |
| Analog I/O | Provides precise processing for continuous current or voltage signals from flow meters, pressure transmitters, and control valves. | 1756-IF16, 1756-OF8, 1756-IF8H |
1756 – IB16 — DC Digital Input Card
1756 – OB16E — Fused DC Digital Output Card
Automation Maintenance Tip: Removable Terminal Blocks (RTBs), such as the 36-pin 1756-TBCH or 1756-TBS6H, are always sold separately from ControlLogix I/O cards. When swapping out a failed I/O module, you can leave the existing RTB completely wired to the enclosure panel, allowing you to hot-swap the hardware card under power without disturbing your field terminations.
When a single channel fails on an older digital or analog I/O module, plant engineers encounter a critical decision path. Sourcing a direct replacement module allows maintenance personnel to clear a system fault instantly, bypass programming updates, and retain historical wiring layouts. Our inventory spans multiple series levels to help you maintain legacy hardware frameworks or transition smoothly toward newer diagnostic I/O infrastructure.
Whether your process loop requires a standard current analog card to track processing instrumentation parameters, or a discontinued legacy relay output block to interface safely with older machinery circuits, TCI Supply can assist. We maintain component inventories across both current factory production runs and obsolete surplus channels to protect your plant from downtime.
Need an Exact 1756-IB16, 1756-OB16E, or 1756-IF16 Module?
TCI Supply carries a deep selection of active production input cards, legacy digital outputs, and isolated analog blocks. Contact our sales desk today for a competitive price quote and rapid shipping options directly to your processing floor.
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