Product Overview

The Allen Bradley 1756-IB16 serves as the standard workhorse for digital signal acquisition within the ControlLogix ecosystem. This module provides 16 sinking inputs, organized into two distinct groups of eight points each. It interfaces high-speed field devices—such as proximity sensors, limit switches, and pushbuttons—directly with the Logix controller. We supply this unit in 100% Brand New, original factory packing with a full 12-month warranty, ensuring seamless integration and long-term stability for your industrial backplane.

Technical Specifications

Engineering Advantages

• Configurable Signal Filtering: The 1756-IB16 allows engineers to define hardware filter times (0, 1, or 2 ms for Off-to-On). This feature effectively eliminates "contact bounce" from mechanical switches, preventing false triggers and erratic logic execution.

• Change of State (COS) Detection: Software configuration enables the module to report data immediately upon a signal transition rather than waiting for a standard RPI (Requested Packet Interval). This drastically reduces system latency for time-critical interlocking functions.

• Built-in Reverse Polarity Protection: The module incorporates robust protection circuitry to prevent hardware failure in the event of field-side wiring errors. This reduces the risk of damaging the internal optoisolators during commissioning.

• Diagnostic Precision: Onboard LEDs provide real-time status for each of the 16 points. This allows maintenance teams to verify field-side power and signal presence without needing a laptop or accessing the controller software.

FAQs

How does the 1756-IB16 differ from the 1756-IB16I?

The 1756-IB16 utilizes group-to-group isolation (8 points per group), meaning all 8 points in a group share a common return. The 1756-IB16I provides individual channel-to-channel isolation. If your application involves different power sources for every single sensor, choose the "I" variant; for standard 24V DC systems, the 1756-IB16 is the more cost-effective choice.

Can I use the 1756-IB16 with 12V DC signals?

Yes. While the nominal voltage is 24V DC, the operating range extends down to 10V DC. However, ensure your 12V signal provides at least 2 mA of current to guarantee the module enters the "On-state."

Does this module require a specific Removable Terminal Block (RTB)?

The module requires either the 1756-TBNH (20-position Cage Clamp) or the 1756-TBSH (20-position Spring Clamp). You must purchase the RTB separately as it does not come standard in the module box.

How do I handle the "Inrush Current" during system startup?

The 1756-IB16 handles a peak inrush of 250 mA. Ensure your field power supply (24V DC) has sufficient overhead to handle the simultaneous activation of multiple inputs without a voltage sag.