Allen-Bradley 1746-IB8 SLC 500 Digital DC Input Module

Product Overview

The Allen-Bradley 1746-IB8 serves as a core discrete interface for the SLC 500 controller platform. This digital DC input module detects status changes from field devices such as limit switches, proximity sensors, and pushbuttons. It utilizes a sinking configuration across 8 independent input points, converting 24V DC nominal field signals into logic-level data for the SLC processor. We supply this unit as 100% Brand New original hardware, ensuring factory-spec dielectric strength and component longevity for your mission-critical automation racks.

Technical Specifications

The 1746-IB8 integrates seamlessly into any standard SLC 1746 chassis using the following electrical parameters:

Engineering Advantages

• Optimized Power Consumption: The module draws only 50 mA from the 5V DC backplane. This low power profile allows engineers to populate high-density racks without exceeding the power supply capacity of the SLC chassis.

• Superior Noise Filtering: Built-in hardware filtering manages signal transitions with an 8 ms delay. This effectively eliminates false triggers caused by contact bounce or electromagnetic interference (EMI) in noisy industrial environments.

• Direct Sinking Logic: The 10–30V DC sinking circuit simplifies wiring when interfacing with PNP-sourced field devices. This standardizes the wiring architecture across the control panel and reduces the need for interposing relays.

• Robust Hardware Footprint: The compact design fits any available slot in the SLC 500 modular chassis. The module supports the 1746-HT heat shield and 1746-HCA connectors, ensuring secure terminal terminations that withstand high-vibration machinery applications.

FAQs

• Q: Can I use the 1746-IB8 with a 12V DC power system?

• A: Yes. The module operates within a 10–30V DC range, making it fully compatible with both 12V and 24V DC industrial control circuits.

• Q: Does this module support sourcing input configurations?

• A: No. The 1746-IB8 uses sinking (NPN) logic. If your application requires sourcing inputs, you must select a module such as the 1746-IV8.

• Q: Is this unit factory sealed or a "new open box" item?

• A: We guarantee this 1746-IB8 is 100% Brand New. It arrives in original factory packaging with intact seals, ensuring the hardware has never seen service in a field environment.

• Q: How does the signal delay affect high-speed counting?

• A: The 8 ms delay filters standard digital inputs for general-purpose use. For high-speed applications requiring microsecond response times, we recommend using a dedicated high-speed counter module like the 1746-HSCE.