Allen-Bradley 1762-L40BWA MicroLogix 1200 40-Point AC Power/DC Input Controller

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 1762-L40BWA is a high-density MicroLogix 1200 controller featuring 24 24V DC inputs and 16 electromechanical relay outputs, making it an ideal choice for material handling, packaging machinery, and localized process skids.

As Rockwell Automation transitions legacy MicroLogix platforms toward mature lifecycle phases, securing genuine New Surplus units is a essential strategy for maintaining existing control cabinets. Installing refurbished PLCs presents significant operational risks; aged power supplies and worn relay contacts can cause random program faults, memory corruption, or welded contacts under inductive loads. Sourcing factory-fresh New Surplus hardware preserves original relay cycle ratings, protects processor integrity, and lowers Total Cost of Ownership by bypassing expensive engineering redesigns and panel retrofits.

1762-L40BWA

1762-L40BWA

1762-L40BWA

Installation & Configuration Guide

1.Pre-Installation (Prep & Safety):Safety warning: Ensure main AC input power is completely isolated before wiring.

Isolate the incoming 120/240V AC power feed and implement Lock-Out/Tag-Out (LOTO) procedures. Wear a grounded ESD wrist strap connected to cabinet earth ground. Inspect line voltage level with a digital multimeter to confirm zero potential across terminals VAC1 and VAC2. Take photos of existing terminal block connections and verify wire numbers.

2.Removal:

Disconnect the 8-pin Mini-DIN serial communication cable from Channel 0. Unfasten the screw clamp terminals on the top and bottom I/O terminal strips. Release the DIN rail retaining latch at the bottom of the 1762-L40BWA unit or remove the four panel-mounting screws, then carefully lift the controller away from the mounting surface.

3.Installation (Clone & Seat):

Unbox the replacement 1762-L40BWA inside an ESD-safe area. If expansion modules are present, snap the 1762 expansion ribbon connector securely into the right side bus port. Mount the controller onto the 35 mm DIN rail until the spring latch engages cleanly. Reattach field wiring to the removable terminal blocks, ensuring correct polarity for 24V DC input commons and relay loads.

4.Power-On & Testing:

Reapply AC utility power. Observe the front LED indicators: the POWER LED should illuminate solid green, and the RUN LED will light up once logic is executed. Connect RSLogix 500 via Channel 0, go online to download program logic or transfer configuration memory from a 1762-MM1 memory module, and cycle I/O forces to verify relay contacts open and close accurately.

Firmware/Software Versions & Upgrade Notes

• Software Compatibility: Programmed using RSLogix 500 (Version 4.50 or higher) or MicroLogix Starter software.
• Firmware Considerations: Revision C and Revision D hardware support enhanced instruction sets and Modbus RTU Master/Slave communications. Always ensure the controller firmware matches or exceeds the offline project file settings created in RSLogix 500.
• Memory Modules: Program logic and data values can be backed up or transferred without a PC using the optional 1762-MM1 Memory Module or 1762-RTC Real-Time Clock/Memory module. Ensure power is off before inserting or removing memory cards.

Frequently Asked Questions (FAQ)

Why is this New Surplus 1762-L40BWA a safer investment than a refurbished unit?

Refurbished micro controllers often retain aged internal power supply components and electromechanical relays that have suffered thermal stress or contact arc pitting over thousands of operations. A degraded relay can fail in a welded “ON” state, causing safety risks or machinery damage. Our New Surplus controllers feature pristine relays with zero operational cycles, pristine logic circuitry, and full expected operating lifespan.

Are these 1762-L40BWA units original Allen-Bradley products?

Yes. We guarantee that every 1762- controller supplied is 100% Original OEM New Surplus. Sourced from audited project cancellations, distributor overstock, and spare machinery inventory, each unit passes rigorous visual, power-up, and functional I/O testing prior to shipment.

What is the maximum number of expansion I/O modules I can attach to this base controller?

The 1762- base unit supports up to 6 1762 expansion I/O modules (such as 1762-IQ8, 1762-OW8, or 1762-IF4). Ensure the total backplane current drawn by the expansion modules does not exceed the controller’s internal power supply capacity (5V DC and 24V DC limits).

Can I communicate with a modern PanelView or PC using this controller?

Yes. Channel 0 (RS-232) supports DF1 Full-Duplex for direct PC connection, DH-485 via a 1761-NET-AIC converter for networking multiple controllers, or Modbus RTU. For EtherNet/IP communication, you can connect a 1761-NET-ENI or third-party serial-to-Ethernet gateway to Channel 0.

What warranty coverage is provided with this New Surplus controller?

All New Surplus 1762- controllers include our standard 1-year replacement warranty. If any functional hardware defect occurs within 12 months under normal working conditions, we will replace the unit immediately from our available stock.