Allen-Bradley 1762-L24BWA MicroLogix 1100 PLC Controller – Obsolete MicroLogix Series Spare Part

Technical Dossier

Product Details And Specifications

Allen-Bradley 1762-L24BWA MicroLogix 1100 PLC Controller – Obsolete MicroLogix Series Spare Part

The 1762-L24BWA is a discontinued unit. Rockwell Automation no longer manufactures or provides factory support for this controller. DriveKNMS maintains RFQ-reviewed sourcing status of this part specifically to serve facilities that have made the deliberate, financially sound decision to extend the operational life of their existing automation infrastructure rather than absorb the cost and risk of a full system overhaul.

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The MicroLogix 1100 platform was widely deployed across discrete manufacturing, water treatment, material handling, and building automation applications throughout the 2000s and early 2010s. Many of these installations remain operational today — not because replacement has been overlooked, but because the cost-benefit analysis consistently favors maintenance over migration.

The 1762-L24BWA occupies a specific role in these architectures: it is the CPU. It holds the ladder logic program, manages all I/O communication, and interfaces with upstream SCADA or HMI systems via Ethernet/IP or DF1 serial. There is no drop-in modern equivalent that preserves the existing program without re-engineering. A failed CPU without a verified spare means the program must be reconstructed — assuming backup copies exist — and the entire control system must be recommissioned from scratch.

Facilities that operate without a cold-spare 1762-L24BWA on the shelf are carrying an unquantified liability. A single unplanned failure event, without a replacement unit available, can result in weeks of production loss while a compatible unit is sourced from the secondary market — if one can be found at all.

How to extend your MicroLogix 1100 system life by 5–10 years:

• Secure at least one verified cold spare CPU. The 1762-L24BWA is the single highest-risk component in the system. All other I/O modules are meaningless without a functioning controller.
• Back up your ladder logic program immediately. Use RSLogix 500 to create and store multiple offline copies in geographically separate locations. A hardware spare without a program backup provides no protection.
• Audit your I/O expansion modules. The 1762-series I/O modules (1762-IQ8, 1762-OW8, etc.) are also discontinued. Identify which modules are installed and source spares for the highest-criticality I/O points.
• Document your Ethernet/IP and DF1 network configuration. IP addressing, node numbers, and communication parameters should be recorded and stored with the hardware spare to enable rapid swap-out by any qualified technician.
• Establish a scheduled inspection cycle. Relay output contacts on the 1762-L24BWA have a finite mechanical life. Tracking output cycle counts on high-frequency outputs allows predictive replacement before failure occurs.

This approach — targeted spare parts procurement combined with disciplined documentation — consistently delivers 5 to 10 additional years of reliable operation from legacy MicroLogix infrastructure at a fraction of the cost of platform migration.

Condition & Reliability Assurance

Sourcing discontinued industrial control hardware from the secondary market carries inherent risk. DriveKNMS applies a structured 5-step quality process to every 1762-L24BWA unit before it is offered for sale.

1. Visual and mechanical inspection. Full examination of the housing, terminal blocks, communication ports, and DIN rail mounting clip for physical damage, corrosion, or evidence of prior field failure.
2. Electrolytic capacitor assessment. The internal power supply capacitors are a known failure point in aging MicroLogix hardware. Units showing capacitor bulging, leakage, or ESR values outside specification are rejected.
3. Firmware version verification. The installed firmware revision is documented. Units with corrupted or unverifiable firmware are not offered as functional spares.
4. Pin and connector integrity check. All communication port pins and I/O terminal connections are inspected for oxidation, bending, and contact resistance. Corroded or deformed contacts are disqualifying.
5. Functional power-on test. Where test infrastructure permits, units are powered and verified to reach normal operating state without fault codes.

Units that pass all five stages are classified as Tested Surplus. Units with cosmetic wear but full functional integrity are classified as Refurbished. Both classifications are clearly disclosed at the time of quotation.

Key Features for System Maintenance

How do I confirm the unit is genuine Allen-Bradley hardware and not a counterfeit?
All units sourced by DriveKNMS are inspected for manufacturer markings, date codes, and board-level construction consistent with genuine Rockwell Automation production. We do not source from regions or channels with known counterfeit risk. Customers may request photos of the specific unit prior to purchase.

Can you source other MicroLogix 1100 series components?
Yes. DriveKNMS specializes in the full MicroLogix 1100 ecosystem including 1762-series I/O expansion modules, communication adapters, and accessories. Contact us with your full bill of materials for a consolidated quotation.