Allen-Bradley 1764-28BXB MicroLogix 1500 Controller Base Unit

Product Overview

The Allen-Bradley 1764-28BXB serves as the high-performance hardware foundation for the MicroLogix 1500 controller system. This base unit provides the essential power supply, integrated I/O, and the interface for the removable 1764 processor (LRP or LSP). We provide this unit in 100% Brand New, original factory condition, ensuring your legacy infrastructure benefits from zero-hour reliability and full manufacturer specifications. It manages 28 onboard I/O points, specifically optimized for 24V DC environments requiring high-speed response.

Technical Specifications

Engineering Advantages

• High-Speed Pulse Capabilities: The 1764-28BXB features dedicated high-speed FET outputs. These allow for Pulse Train Output (PTO) and Pulse Width Modulation (PWM), enabling direct control of stepper drives and servo motors without additional motion modules.

• Hybrid Output Flexibility: This base unit combines rugged mechanical relays for high-load switching with solid-state FET outputs for high-frequency cycling. This hybrid design eliminates the need for separate digital output cards in many standard machine control applications.

• Modular Processing Power: The split-module design allows you to upgrade the processor (via the 1764-LRP/LSP) or replace the power/base unit independently. This minimizes maintenance costs and facilitates rapid hardware swaps during troubleshooting.

• Robust Expansion Bus: The integrated 1769-compliant bus allows the 1764-28BXB to power and communicate with up to 16 expansion modules. This scalability transforms a compact MicroLogix unit into a high-density controller capable of managing complex analog and digital arrays.

• Industrial Noise Immunity: Advanced optical isolation protects the internal logic from field-side electrical transients. This ensures stable operation near variable frequency drives (VFDs) and large contactors common in harsh manufacturing environments.

FAQs

• Does this unit include the processor (CPU)?

  No. The 1764-28BXB is the Base Unit only. You must install a 1764-LSP or 1764-LRP processor into the front slot to make the PLC operational.

• Can I use 120V AC to power this specific model?

  No. The 1764-28BXB requires a 24V DC input. If your application only provides 120V AC, you would require the 1764-24AWA base unit instead.

• What is the maximum frequency of the high-speed inputs?

  The unit supports 20 kHz high-speed counters on the first 8 inputs. This makes it ideal for interfacing with high-resolution encoders or high-speed proximity sensors for flow metering and positioning.

• Is this a refurbished or open-box item?

  Absolutely not. We guarantee this unit is 100% Brand New, arriving in the original Allen-Bradley factory box with the original factory seal.