Allen-Bradley 1762-L40BXBR MicroLogix 1200 24V DC Power Supply with 40 I/O Points

Product Overview

The Allen-Bradley 1762-L40BXBR​ is a 24V DC powered controller module that forms the foundation of the MicroLogix 1200 programmable logic controller (PLC) platform from Rockwell Automation. The Allen-Bradley 1762-L40BXBR​ is not a standalone power supply in the conventional sense; rather, it is an integrated controller module that combines a 24V DC power input section, a processor with 6.4K words of user memory, and 40 built-in I/O points in a single compact housing. This integration makes the Allen-Bradley 1762-L40BXBR​ one of the most space-efficient and cost-effective controller solutions in the Rockwell Automation portfolio, delivering substantial control capability in applications where panel space, budget, and wiring complexity must all be minimized.

The defining hardware characteristic of the Allen-Bradley 1762-L40BXBR​ is its 24V DC power input, which accepts an operating voltage range of 19.2–28.8V DC and consumes 4.5W in the 1762-L40BXBR/B revision and 2.2W in the later 1762-L40BXBR/C revision under nominal conditions. Unlike AC-powered MicroLogix controllers that require 120/240V AC line voltage, the Allen-Bradley 1762-L40BXBR​ is designed for installation in 24V DC control systems—the dominant control voltage in European, Asian, and modern North American machinery. This makes the module particularly attractive for machine builders exporting equipment to international markets, as it eliminates the need for a separate 24V DC power supply in panels already equipped with a 24V DC control transformer or power supply.

The Allen-Bradley 1762-L40BXBR​ features 24 discrete 24V DC sink inputs and 16 relay outputs rated at 240V AC / 24V DC, 2.0A per output. The relay outputs are a significant advantage in applications requiring dry contact switching of AC and DC loads at different voltages, as each output provides a completely isolated electromechanical contact capable of switching 240V AC inductive loads or 24V DC resistive loads. This contrasts with solid-state transistor outputs, which are polarity-sensitive and voltage-limited. The relay outputs of the Allen-Bradley 1762-L40BXBR​ are particularly valuable in applications involving solenoid valves, motor starters, indicator lamps, and small contactors where AC and DC loads must be mixed.

The processor section of the Allen-Bradley 1762-L40BXBR​ executes the full MicroLogix instruction set and provides 6.4K words of user memory for program and data storage. The module supports up to three 1762-series expansion I/O modules, allowing the base 40-point configuration to be extended to a maximum of 80 I/O points per controller. Communication is provided through two independent serial ports: a DH-485 network port for peer-to-peer communication with other MicroLogix controllers, SLC 500 processors, and PanelView terminals, and an RS-232 port configurable for DF1 full-duplex, DH-485, or ASCII protocol for connection to programming terminals, serial printers, bar code readers, and weigh scales.

The Allen-Bradley 1762-L40BXBR​ is currently classified as an Active Mature product in the Rockwell Automation lifecycle, with the 1762-L40BXBR/B revision (series B) carrying a standard one-year warranty and the later 1762-L40BXBR/C revision (series C) also available. The module carries UL Listing, CE compliance, and C-Tick certification, and is rated for operation in ambient temperatures from 0°C to 60°C with 5–95% non-condensing relative humidity.

Technical Specifications