Allen-Bradley 1764-LRP 24KB User Memory Processor Module

Description

Key Technical Specifications

Product Introduction & Supply Chain Strategy

This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo rigorous quality verification to ensure OEM-level reliability. The Allen-Bradley 1764-LRP is the premium processor unit for the MicroLogix 1500 architecture, providing 24KB user memory, an integrated real-time clock, and dual independent RS-232 serial ports for concurrent operator interface and SCADA connectivity.

As Rockwell Automation has declared the MicroLogix 1500 platform End-of-Life (EOL), securing genuine New Surplus processors is the primary line of defense against catastrophic line stoppages. Installing refurbished processors presents severe operational vulnerabilities; degraded internal flash memory, aged lithuim backup circuitry, and worn port transceivers on second-hand units frequently lead to program corruption and communication dropouts. Sourcing factory-fresh New Surplus hardware preserves full program retention, guarantees reliable dual-port communications, and dramatically lowers Total Cost of Ownership by deferring multi-thousand-dollar system re-engineering costs.

1764-LRP

1764-LRP

1764-LRP

Installation & Configuration Guide

1.Pre-Installation (Prep & Safety):Safety warning: Ensure base power is off and ESD strap is grounded before processor insertion.

Isolate main AC/DC supply power to the 1764 Base Unit and implement Lock-Out/Tag-Out (LOTO) protocols. Wear a grounded ESD wrist strap connected to cabinet earth ground. Inspect the base unit processor connector track for debris or bent contact pins.

2.Removal:

Disconnect Channel 0 (Mini-DIN) and Channel 1 (DB-9) serial communication cables. Depress the top and bottom processor release latches on the legacy 1764-LRP module. Pull the processor unit straight forward out of the base chassis socket without twisting.

3.Installation (Clone & Seat):

Unpack the New Surplus 1764-LRP processor in an ESD-protected zone. Align the guide rails on the rear of the processor with the base unit socket tracks. Push the processor firmly into the base unit until both the top and bottom latches click into a locked position. Reattach serial cables to Channel 0 and Channel 1.

4.Power-On & Testing:

Reapply power to the base unit. Verify the front panel POWER LED illuminates solid green and the FAULT indicator is off. Connect via RSLogix 500 using Channel 0 or Channel 1, perform a memory clear if necessary, download the system ladder logic program, and set the processor mode to REMOTE RUN.

Firmware/Software Versions & Upgrade Notes

• Software Support: Programmed exclusively using RSLogix 500 software (Version 5.50 or higher required to access full 24KB memory and Channel 1 parameters).
• Firmware Considerations: Firmware Revision C or Series C hardware is recommended for applications utilizing advanced Modbus RTU Master/Slave communications and expanded ASCII buffer instructions.
• Memory Module Compatibility: Optional memory modules (1764-MM1, 1764-MM2, 1764-MM3) must match processor revision support. Installing an incompatible memory card will cause a fatal controller fault upon boot-up.

Frequently Asked Questions (FAQ)

Why is this New Surplus 1764-LRP a safer option than a cheaper refurbished module?

Refurbished 1764-LRP processors carry hidden risks, such as worn EEPROM/flash memory blocks that can fail during program downloads or power cycles. Additionally, second-hand units often have heat-degraded communication transceivers on Channel 1 that cause erratic network timeouts. Investing in New Surplus guarantees zero operating hours, pristine memory cells, intact serial port isolation, and full expected operating life.

Are these 1764-LRP processors genuine OEM products?

Yes. We strictly guarantee that every 1764-LRP module supplied is 100% Original OEM New Surplus. Sourced from audited distributor excess, plant spares, and canceled project inventories, each processor undergoes visual checks, mechanical connector alignment inspections, and live bench testing before shipment.

What is the main operational difference between the 1764-LSP and 1764-LRP?

The 1764-LRP provides 24KB of user memory (compared to 14KB on the 1764-LSP), includes an onboard Real-Time Clock (RTC), and features a second independent RS-232 communication port (Channel 1 DB-9). This second port enables simultaneous communication with an HMI touchscreen and a SCADA network without requiring external port splitters.

Can I swap a 1764-LRP processor without replacing the 1764 Base Unit?

Yes. The 1764-LRP is a modular processor that plugs directly into any standard MicroLogix 1500 base unit (1764-24AWA, 1764-24BWA, or 1764-28BXB). As long as the base unit power supply and I/O remain functional, swapping the 1764-LRP processor requires no rewiring of field devices.

What warranty is included with this New Surplus processor?

All New Surplus 1764-LRP processor modules come with our full 1-year replacement warranty. In the event of any operational or hardware defect under standard working conditions within 12 months, we will replace the unit immediately from our available stock.