1762-L40BXB | Allen Bradley MicroLogix 1200 Programmable Logic Controller 24V DC

Technical Overview

The 1762-L40BXB (Part Number 1762-L40BXB) is a high-density, small-scale programmable logic controller designed for industrial automation systems requiring a balance of compact design and high I/O counts. Operating on a 24V DC power supply, this MicroLogix 1200 unit features 40 embedded I/O points, including specialized high-speed inputs and FET outputs tailored for motion control and precise event-timing applications.

Designed for both stand-alone and networked operation, the 1762-L40BXB (1762-L40BXB) supports sophisticated instruction sets via RSLogix 500 software. Its integrated RS-232C port allows for flexible serial communication with HMIs, programming terminals, and other controllers via Modbus RTU or DF1 protocols. Although the series reached its end-of-life status in late 2021, it remains a cornerstone for maintaining and expanding legacy industrial machinery and distributed control nodes.

Technical Specifications

• Input Voltage 24V DC (SELV Class 2)

• Total Digital Inputs 24 (20 Standard 24V DC and 4 Fast 24V DC)

• High-Speed Inputs 4 Channels (Up to 20 kHz support)

• Total Digital Outputs 16 Points

• Output Configuration 8 Relay Contacts and 8 24V DC FET (Source)

• Relay Load Rating 24–125V DC; 120–240V AC

• FET High-Speed Output 1 Channel (Supports pulse train output)

• Program Memory 6 KB User Memory (4KB Program / 2KB Data)

• Communication Interface Isolated RS-232C (8-pin Mini-DIN)

• Supported Protocols Modbus RTU, DF1, DH-485, ASCII

• Expansion Capability Supports up to six 1762 expansion modules

• Operating Temperature 0 to 55 °C (32 to 131 °F)

• Dimensions 90 mm Height x 160 mm Width x 87 mm Depth

• Weight 1.44 lbs (0.65 kg)

Key Functional Advantages

The 1762-L40BXB (1762-L40BXB) is engineered for reliability in demanding machine-level environments

• Dual output technology allows for switching high-current AC/DC loads via relays while simultaneously providing high-frequency pulses via FETs.

• Embedded 20 kHz high-speed counter provides accurate tracking for encoders and high-speed motion sensors.

• Robust 24V DC architecture is ideal for battery-backed systems and vehicles where AC power is unavailable.

• DIN-rail or panel-mounting versatility facilitates integration into tight control cabinet footprints.

Technical FAQ

Which programming software is required for this controller?The 1762-L40BXB (Part Number 1762-L40BXB) is programmed using RSLogix 500. It is also compatible with Connected Components Workbench (CCW) for basic configuration and monitoring.

Can I use this module to control a stepper motor?Yes, the integrated high-speed FET output is capable of generating Pulse Train Outputs (PTO) for simple open-loop motion control of stepper or servo drives.

What is the maximum I/O count after expansion?While the base unit has 40 points, adding six maximum 1762 expansion modules can significantly increase the total point count and add analog or temperature sensing capabilities.