1762-L40BXB Allen-Bradley MicroLogix 1200 Programmable Controller

1762-L40BXB Allen-Bradley MicroLogix 1200 Programmable Controller

The 1762-L40BXB is a MicroLogix 1200 programmable controller from Allen-Bradley / Rockwell Automation. It combines a 24V DC power supply, 24 inputs, and 16 outputs in one compact brick. Engineers use it for standalone machine control, retrofit panels, and small process skids. The 1762-L40BXB keeps wiring simple and fits tight cabinet space.

Series Overview

• MicroLogix 1200 targets small to mid-size control tasks.
• Built-in power supply removes the need for a separate 24V unit.
• Expandable I/O via the 1762 bus keeps panel growth simple.
• RS232 port supports DF1, DH485, Modbus, and ASCII.
• Trim potentiometers allow quick timer and counter tuning.
• Memory module keeps the user program safe after power loss.

Technical Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Model: 1762-L40BXB
• Series: MicroLogix 1200
• Product Type: Programmable Controller
• Power Supply: 24V DC (-15%, +10%), Class 2 SELV
• Inputs: 24 total. 20 x 24V DC plus 4 x fast 24V DC
• Input Circuit: 24V DC sink/source
• Outputs: 16 total. 8 relay, 7 x 24V DC FET, 1 high-speed 24V DC FET
• Relay Contact Rating: 24-125V DC; 120-240V AC
• Operating Frequency: 0 to 20 kHz
• Load Current: 10A minimum
• Heat Dissipation: 21 W
• Mechanical Cycles: 20,000,000
• Ambient Operating Temp: 0 to 55°C
• Weight: 2.4 lb
• Dimensions: 90 mm H x 160 mm W x 87 mm D

Input Group Detail

• Inputs 0-3 run as fast inputs. On-state 14-24V DC. Off-state 0-5V DC. Frequency 0-20 kHz. Nominal impedance 3.3 KΩ.
• Inputs 4 and above run as standard inputs. On-state 10-24V DC. Frequency 0-1 kHz. Nominal impedance 2.7 KΩ.
• Off-state leakage current is 1.5 mA for both groups.
• Current per group is 8A. Do not exceed this limit.

Communication and Memory

• RS232 port uses an 8-pin mini DIN terminal.
• Protocols: DF1, DH485, Modbus, ASCII.
• Port handles program download, upload, monitoring, and testing.
• Memory module 1762-MM1 stores the user program.
• 1762-RTC adds real-time clock for timestamped events.
• 1762-MM1RTC combines memory and clock in one module.

Trim Potentiometers

• Three trimmers allow live data modification.
• Use them as timer, counter, or analog simulation registers.
• Adjust with a small precision flathead screwdriver.
• Useful for setup tuning without a programming terminal.

Compatible Equipment

• 1762 series expansion I/O modules
• PanelView and other HMI units over DF1 or Modbus
• 24V DC sensors, switches, and relay contacts
• Relay-driven solenoids, contactors, and lamps
• Legacy MicroLogix 1000 and 1100 replacement projects

Installation Notes

• Mount on DIN rail or panel with the 1762 clip.
• Keep clearance for heat dissipation of 21 W.
• Separate 24V DC input wiring from relay output wiring.
• Check group current stays under 8A.
• Terminate the RS232 shield at one end only.

Oiltech Controls Review

Our bench team checks the 1762-L40BXB on a live 24V DC supply. We verify each input group, all relay outputs, and the RS232 port. Trimmer response and memory retention also get tested. Units ship only after they pass. This matters for engineers replacing a failed controller in a running line.

Oiltech Controls’s Insight

• The 4 fast inputs suit encoder and pulse counting tasks.
• Mixed relay and FET outputs cover both AC and DC loads.
• Buy the 1762-MM1RTC if you need event timestamps.
• Keep a spare memory module for fast program recovery.
• Check firmware revision before you swap a unit.

FAQ

Q: Can the 1762-L40BXB run on AC power?

A: No. This catalog number uses a 24V DC power supply. Check the 1762-L40AWA if you need 120-240V AC input.

Q: What load can the relay outputs handle?

A: Relay contacts rate 24-125V DC and 120-240V AC. Keep total current within the 8A per group limit.

Q: Do I need the real-time clock module?

A: Add the 1762-RTC or 1762-MM1RTC only if your process logs timestamped events. Basic control works without it.

Q: How do I pick between this unit and a MicroLogix 1100?

A: Choose the 1762-L40BXB when you need 24 inputs, 16 outputs, and fast pulse inputs. The 1100 fits smaller point counts and built-in Ethernet needs.

Q: What should I check before buying a surplus controller?

A: Confirm firmware revision, memory module type, and relay condition. Ask for a test record. Our team sends one with every unit.

Shipping and Warranty

• Dispatch within 24-28 hours after payment.
• Carriers: FedEx, UPS, DHL.
• 12-month warranty covers hardware faults.
• Test record ships with each unit.