Allen-Bradley 1768-L43 CompactLogix Processor Module

1768-L43 Allen-Bradley CompactLogix Processor Module

Product Introduction

The 1768-L43 processor module belongs to the Allen-Bradley CompactLogix product family. Manufacturers and system integrators choose this controller for medium-scale automation tasks. It provides powerful Logix processing capabilities without occupying excessive panel space.

This controller requires a power supply, an end cap, a serial programming cable, and either mounting screws or a DIN rail for proper installation. The 1768-L43 works seamlessly with 1769 Compact I/O modules and 1768 backplane modules.

With 2MB of built-in memory, this processor handles complex control logic and data management efficiently. Furthermore, the 1768-L43 supports optional CompactFlash memory for program backup and data transfer between controllers.

Technical Specifications

The 1768-L43 offers robust specifications that meet demanding industrial requirements.

Key parameters include:

• Manufacturer: Allen-Bradley

• Part Number: 1768-L43

• Product Line: CompactLogix

• Module Type: Processor Module

• Integrated Memory: 2 MB

• Communication Ports: One (1) RS232

• Maximum I/O Modules Supported: 16 modules

• Maximum I/O Banks Supported: 2 banks

• Backplane Current: 1.3 Amps at 24 Volts

• Power Consumption: 31.1 Watts maximum

• Power Dissipation: 6.3 Watts

• Operating Temperature: 0° to +60°C (+32° to +140°F)

• Storage Temperature: -40° to +85°C (-40° to +185°F)

• Relative Humidity: 5% to 95% non-condensing

• Vibration Resistance: 10 to 500 Hz, 5G, 0.030 in. peak-to-peak

Communication and Connectivity

The 1768-L43 includes a fully isolated RS232 serial port. This port supports communication speeds up to 38.4 Kbps. You can connect programming terminals, HMIs, or other serial devices through this interface.

For programming and connectivity, Allen-Bradley recommends using either the 1747-CP3 or 1756-CP3 serial cables. These cables feature a right-angle connector on the controller side and a straight connector for the serial port. The cable length measures 3 meters, providing flexible placement options.

Additionally, the 1768-L43 provides several status LEDs on its front panel. These indicators include PWR, I/O PWR, RUN, FORCE, MEM SAVE, I/O, OK, CF, DCH0, and CH0. Operators can quickly check controller health and operational status at a glance.

Memory and Data Management

The 1768-L43 comes with 2MB of integrated memory. This allocation stores user programs, tag data, and configuration settings.

Moreover, this controller supports an optional 1784-CF128 CompactFlash memory card. This non-volatile memory option enables automatic program loading, modular data transfer to another compatible controller, and protection against accidental program deletion.

With this memory flexibility, you can back up critical control logic and restore it quickly when needed. The 1768-L43 also supports tag-based and alias addressing, simplifying programming and data management.

I/O Expansion Capabilities

The 1768-L43 supports up to 16 1769 Compact I/O modules in the local chassis. This capacity handles a wide range of digital and analog input/output requirements.

Furthermore, the controller supports expansion across up to two remote I/O banks. Each bank can host additional 1768 backplane modules, extending system coverage without sacrificing performance.

When planning your system layout, remember that the 1768-L43 requires proper clearance for ventilation. Maintain top and bottom clearances of 105 mm (4.13 inches) and side clearances of 90 mm (3.54 inches). These clearances ensure adequate air circulation and keep the operating temperature within the 0° to 60°C range.

Programming and Software Support

The 1768-L43 supports multiple programming languages. Programmers can use Ladder Logic, Statement List, or Function Block diagrams. This flexibility accommodates different application requirements and programmer preferences.

The controller also supports tag-based and alias addressing. Tag-based programming simplifies code maintenance and improves readability. Aliases allow you to assign meaningful names to physical addresses, reducing programming errors.

Mechanical and Mounting Information

The 1768-L43 weighs approximately 11.9 ounces (0.34 kg) and ships in a package measuring 5.18 x 2.65 x 4.80 inches. Its compact design fits easily into control cabinets with limited space.

Mounting options include panel mounting or DIN rail installation. For panel mounting, use M4 or #8 screws. Ensure the mounting surface is flat and secure to prevent vibration-related issues.

This controller carries a T4 temperature code (135°C) and works with any open-style enclosure rating. This rating makes the 1768-L43 suitable for various industrial environments.

Packaging and Shipping

Each 1768-L43 ships in protective packaging to prevent damage during transit. The package includes the processor module only.

We do not include mounting screws, DIN rail, cables, or programming software inside the box. For these accessories, please refer to your system requirements and order them separately.

We ship all orders via FedEx, UPS, or DHL. Choose your preferred carrier at checkout. Delivery times vary by destination, but most orders arrive within 3–7 business days.

Frequently Asked Questions

1. Is the 1768-L43 compatible with 1769 I/O modules?
Yes, the 1768-L43 supports up to 16 1769 Compact I/O modules in the local chassis.

2. What programming cable works with the 1768-L43?
You can use either the 1747-CP3 or 1756-CP3 serial cable for programming and connectivity.

3. Can I expand memory on the 1768-L43?
Yes, the 1768-L43 accepts an optional 1784-CF128 CompactFlash memory card for program storage and transfer.

4. What mounting options does the 1768-L43 support?
This controller mounts on a panel using M4 or #8 screws, or on a DIN rail.

5. What are the temperature limits for the 1768-L43?
The operating range is 0° to +60°C (32° to +140°F), while storage temperature ranges from -40° to +85°C (-40° to +185°F).