Product Overview

The Allen-Bradley 1768-L43 is a CompactLogix industrial controller. This controller handles medium-sized industrial applications. It provides Logix automation platform capabilities in a compact form. The controller requires a power supply, end cap, serial cable, and mounting hardware for operation. It supports both panel and DIN rail mounting. A key switch on the front panel changes the operating mode manually.

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Part Number Breakdown (Tree Structure)

• 1768 → Series Family
  • CompactLogix platform
  • Allen-Bradley / Rockwell Automation
• L → Product Type
  • Logix controller (processor)
• 43 → Specific Model
  • 2 MB memory
  • Medium-sized applications

Key Specifications

• Brand: Allen-Bradley / Rockwell Automation
• Part Number: Allen-Bradley 1768-L43
• Product Line: CompactLogix
• Module Type: Processor Module
• Integrated Memory: 2 MB
• Backplane Current: 1.3 Amps at 24 Volts
• Power Consumption: 31.1 Watts maximum
• Power Dissipation: 6.3 Watts
• Isolation Voltage: 30 Volts (tested at 500V AC between RS232 and system)
• Temperature Code: T4 (135°C)

Memory Features

• 2 MB integrated memory for user programs and data.
• Optional 1784-CF128 CompactFlash memory for expansion.
• CompactFlash supports automatic program loading.
• Enables modular transfer to another compatible controller.
• Prevents unwanted deletion of programs and data.

Communication Port

• Port Type: One fully isolated RS232 serial port
• Maximum Speed: 38.4 Kbps
• Recommended Cables: 1756-CP3 or 1747-CP3
• Cable: Right-angle connector to controller, straight to serial port
• Length: 3 meters

I/O Capacity and Expansion

• Maximum I/O Modules: 16 (1769 Compact I/O modules in local chassis)
• Maximum I/O Banks: 2 banks (remote I/O expansion)
• Backplane Current Rating: 4 (power supply distance)
• 1768 Modules Supported: Up to 2 modules
• Supports motion control applications.
• Compatible for use with safety controllers.

Status Indicators (LEDs)

• PWR: Power status
• I/O PWR: I/O power status
• RUN: Controller running
• FORCE: Forces active
• MEM SAVE: Memory save operation
• I/O: I/O communication status
• OK: Controller health
• CF: CompactFlash status
• DCH0: Communication channel 0 status
• CH0: Channel 0 status

Programming Languages

• Ladder Diagram
• Statement List
• Function Block Diagram
• Supports tag-based addressing
• Supports alias addressing

Environmental Specifications

• Operating Temperature: 0°C to +60°C (32°F to 140°F)
• Storage Temperature: -40°C to +85°C (-40°F to 185°F)
• Relative Humidity: 5% to 95% non-condensing
• Vibration (Operating): 10 to 500 Hz, 5G, 0.030 in peak-to-peak
• Enclosure Rating: Open style

Clearance Requirements

• Top and Bottom Clearance: 105 mm (4.13 inches)
• Side Clearance: 90 mm (3.54 inches)
• Clearances ensure proper air circulation.
• Maintain ambient operating temperature.

Mounting Options

• Panel mount (wall mount) using M4 or #8 screws
• DIN rail mounting (35 mm standard)
• Mounting screws not included (order separately)

Physical Specifications

• Weight: 11.9 ounces (0.34 kg)
• Shipping Dimensions: 5.18 x 2.65 x 4.80 inches
• Shipping Weight: 2 pounds (0.91 kg) with packaging

Installation Guide

• Turn off all power before installation.
• Mount the controller on DIN rail or panel.
• Use M4 or #8 screws for panel mounting.
• Leave 105 mm clearance top and bottom for ventilation.
• Leave 90 mm clearance on sides for airflow.
• Connect power supply to the controller.
• Attach the end cap to the end of the bank.
• Connect programming cable (1756-CP3 or 1747-CP3) to RS232 port.
• Apply power and check LED status indicators.
• Download your program using Logix software.

Maintenance Tips

• Check LED indicators for fault conditions.
• Monitor controller temperature in the enclosure.
• Ensure clearances are maintained for cooling.
• Keep memory backup using CompactFlash card.
• Perform regular program backups.
• Replace battery if memory retention is lost.

Troubleshooting Tips

• If OK LED is red, check power supply and backplane.
• If RUN LED is off, controller may be in program mode.
• Check key switch position (Run/Prog/Rem).
• Verify RS232 cable is properly connected.
• Use configuration software to view fault codes.
• Check CompactFlash status via CF LED.

Typical Applications

• Medium-sized machine control
• Material handling systems
• Packaging machinery
• Conveyor control systems
• Assembly line automation
• Motion control applications
• Process skid control

Package Contents

• One Allen-Bradley 1768-L43 CompactLogix controller
• One product label
• Programming cable not included (order separately)
• Mounting screws not included
• Power supply not included

Warranty and Shipping

• 12 months factory warranty from shipment date.
• Warranty covers manufacturing defects only.
• Physical damage or overvoltage voids warranty.
• Shipping options: FedEx, UPS, DHL.
• Tracking number provided after shipment.

Frequently Asked Questions (FAQ)

Q1: How much memory does the 1768-L43 have?

The Allen-Bradley 1768-L43 has 2 MB of integrated memory. You can add optional 1784-CF128 CompactFlash memory for expansion. This provides automatic program loading and data transfer capabilities.

Q2: How many I/O modules does the 1768-L43 support?

This controller supports up to 16 I/O modules in the local chassis. It supports expansion to 2 remote I/O banks. Up to 2 additional 1768 modules can also be installed.

Q3: What programming cable works with the 1768-L43?

Use 1756-CP3 or 1747-CP3 serial cable. Both have a right-angle connector for the controller side. The other end is straight for the PC serial port. Cable length is 3 meters.

Q4: What are the clearance requirements for installation?

Maintain 105 mm (4.13 inches) clearance top and bottom. Maintain 90 mm (3.54 inches) clearance on sides. These clearances ensure proper ventilation and cooling.

Q5: Does the 1768-L43 support motion control?

Yes, this controller supports motion control applications. It is also compatible for use with safety controllers. Use it for integrated motion and safety in medium-sized applications.

Buying Guide

When you buy a Allen-Bradley 1768-L43 CompactLogix controller, follow these tips. First, check your application size. This controller suits medium-sized applications. Second, count your I/O modules. This controller supports 16 modules. Third, order a programming cable. Choose 1756-CP3 or 1747-CP3. Fourth, plan your mounting method. Use DIN rail or panel mount. Fifth, calculate your power budget. Controller consumes 31.1 Watts maximum. Sixth, consider memory needs. Add 1784-CF128 CompactFlash for expansion. Seventh, maintain proper clearances. Leave 105 mm top/bottom and 90 mm sides. Eighth, check your temperature range. Operating range is 0-60°C. Ninth, review warranty terms. We offer 12 months coverage. Tenth, choose your shipping method. We use FedEx, UPS, and DHL. Finally, test the controller with a simple program before full deployment.

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