Description

Brief Product Description

The Allen-Bradley 1764-24AWA serves as the foundational hardware for the MicroLogix 1500 system, providing integrated I/O and a versatile power supply.¹ It houses the processing unit and manages 24 local I/O points while supporting extensive expansion through the 1769 Compact I/O series.

Product Description

Modular Core for MicroLogix 1500 Systems

The Allen-Bradley 1764-24AWA provides the essential framework for the MicroLogix 1500 series, specifically designed to house the 1764-LRP or 1764-LSP processor modules.² This base unit effectively bridges the gap between small and mid-sized control systems by offering a scalable architecture. It integrates 12 inputs rated for 120V AC and 12 relay outputs, including two isolated relays for diverse circuit requirements.³ By utilizing this modular approach, engineers can replace or upgrade the processor without disturbing the field wiring connected to the base, significantly reducing maintenance time and potential wiring errors.

Extensive I/O Scalability and Power Management

This base unit supports significant growth through its compatibility with 1769 Compact I/O modules.⁴ While the unit starts with 24 embedded points, it can expand to manage up to 512 I/O points by connecting local or remote expansion banks. The internal power supply operates across a broad range of 85V to 265V AC, allowing the hardware to function globally without specialized transformers. Consequently, the unit provides a robust 70VA power capacity to support the processor and attached modules. High-current relay outputs, featuring a break capacity of 1440VA, enable the direct control of large industrial loads without the immediate need for interposing relays.

Advanced Connectivity and Data Integrity

Effective communication remains a priority for the 1764-24AWA, which features a built-in RS-232 port supporting DF1 protocol.⁵ For more complex network requirements, the base unit integrates with DeviceNet or EtherNet/IP through the use of external adapters or 1769-series scanner modules. To safeguard operational data, the unit works in tandem with the processor’s memory (ranging from 7K to 14K words) and utilizes a 1747-BA battery for long-term retention.⁶ This combination of high-speed program execution (approximately 1ms/K) and optional memory modules for firmware backup makes this base unit a reliable choice for time-critical automation tasks in manufacturing and process control.

Technical Specifications