Allen-Bradley 1762-L40BWA MicroLogix 1200 40-Point PLC Controller

June 6, 2026 • 3 min read • wayne • News

Product Summary

This MicroLogix 1200 controller provides a robust 40-point I/O solution. It features twenty-four 24VDC inputs and sixteen relay outputs. The 1762-L40BWA integrates a power supply for 120-240VAC operation. This unit supports flexible DIN Rail or panel mounting.

Theme Option A: Product Procurement & Buyer Guide

Matching the 1762-L40BWA to Your Application

Buyers need a controller that handles mixed voltage signals effectively. The 1762-L40BWA provides twenty-four discrete inputs. These inputs accept 24 Volts DC and support sink or source wiring. This flexibility removes the need for extra signal converters. It simplifies your cabinet design significantly.

The unit contains sixteen relay outputs rated for 10A loads. These relay contacts handle 24-125VDC or 120-240VAC circuits. You can directly control motors, valves, and contactors. This saves money on additional interposing relays. It reduces total system cost and wiring time.

Understanding Power and Environmental Needs

The 1762-L40BWA includes an internal power supply. It draws 82 VA from a 120-240VAC source. Engineers must account for a high inrush current. Expect 25A at 120VAC for 8 milliseconds. At 240VAC, the inrush reaches 40A for 4 ms.

Proper enclosure climate control is critical for longevity. The device operates between 0 and 55 degrees Celsius. You must maintain enclosure air temperature within this range. Consider using a heater in cold environments. Use a fan or air conditioner for hot locations.

Theme Option B: Step-by-Step User & Installation Guide

Preparing for Mechanical Installation

First, verify your enclosure has adequate protection for electronics. Mount the 1762-L40BWA on a standard DIN rail. Ensure the DIN latch is open during installation. The unit requires 90mm of height clearance. With the latch open, you need 104mm clearance.

Secure the module to a panel if preferred. The panel mount option offers stable support. Maintain clearance for ventilation around the device. Never block airflow to the power supply section.

Wiring the Inputs and Outputs

Your 24VDC input devices connect to the input terminals. The controller accepts sinking or sourcing input field wiring. Wire the four fast inputs separately for high-speed signals. These inputs capture rapid sensor events accurately.

Connect your output loads to the sixteen relay terminals. Each relay contact supports up to 10A continuous current. The relays handle both DC and AC loads efficiently. Ensure the total load does not exceed contact ratings. The mechanical life exceeds 20,000,000 cycles.

Establishing Serial Communication

The controller includes an integrated 8-pin Mini DIN RS232 port. This port supports DF1, Modbus, and ASCII protocols. Use a 1761-NET-AIC converter for DH-485 networking. Alternatively, connect RS232 to Ethernet converters easily.

Configure the protocol for peer-to-peer master or slave modes. This allows seamless data exchange with other devices. Use shielded cabling for reliable long-distance communication.