Product Overview
When a production line stalls, every hour of downtime erodes your bottom line. The Allen-Bradley 1768-L43S Compact GuardLogix controller keeps your operation moving with a practical blend of control, safety, and integrated motion in one compact module. This controller belongs to the Compact GuardLogix product line from Rockwell Automation, built for applications that demand both standard logic and safety functionality without a rack full of separate hardware.
With 2 MB of standard memory and an additional 0.5 MB of safety memory, the 1768-L43S handles demanding programs while keeping safety routines isolated and reliable. It weighs just 15.9 ounces and measures 5.18 x 3.55 x 4.8 inches, so it fits into tight panels where space is at a premium. Available in Series A and B, this controller delivers consistent performance across revisions.
Technical Specifications
| Specification | Value |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number | 1768-L43S |
| Product Line | Compact GuardLogix |
| Module Type | Controller |
| Standard Memory | 2 MB |
| Safety Memory | 0.5 MB |
| Isolation Voltage | 30 Volts Continuous |
| Backplane Current | 1.4 Amps at 24 Volts |
| Power Consumption | 33.6 Watts |
| Power Dissipation | 7.5 Watts |
| Dimensions (HxWxD) | 5.18 x 3.55 x 4.8 inches |
| Weight | 15.9 ounces |
| Operating Temperature | 0 to 60 degrees Celsius |
| Storage Temperature | -4 to 85 degrees Celsius |
| Relative Humidity | 5 to 95% non-condensing |
| Vibration | 5 g at 10 to 500 Hertz |
| Operating Shock | 30 g |
| Nonoperating Shock | 50 g |
| Radiated RF Immunity | 10V/m with 1 kHz sine-wave 80% AM from 80 to 2000 MHz |
| UPC | 10612598672186 |
Built for Demanding Industrial Environments
The 1768-L43S thrives where conditions are less than ideal. Its operating temperature range of 0 to 60 degrees Celsius handles typical plant floor heat, while storage from -4 to 85 degrees Celsius protects the unit during shutdowns or transport. With 5 to 95% non-condensing humidity tolerance and 5 g vibration resistance at 10 to 500 Hertz, this controller stands up to the constant hum of compressors, pumps, and conveyors found in oil, gas, and heavy manufacturing.
The 30 Volts continuous isolation voltage adds a layer of electrical separation that protects sensitive logic from transients. Power consumption sits at 33.6 Watts with 7.5 Watts dissipation, so panel heat buildup stays manageable without oversized cooling systems.
Applications Across Oil, Gas, and Automation
In oil and gas operations, the 1768-L43S is ideal for controllable systems on EtherNet/IP or ControlNet. You can deploy it on wellhead control panels, pipeline monitoring skids, or compressor stations where integrated safety and standard control reduce wiring complexity. The rackless input and output design simplifies installation, cutting panel build time and reducing cabinet footprint.
For manufacturing lines, the controller’s fully-integrated motion capability means you can synchronize drives and actuators without adding separate motion modules. Security controls protect your program from unauthorized changes, a critical feature when multiple contractors access the same system.
Installation and Integration Notes
The 1768-L43S works well in an economical platform with rackless I/O. When wiring into EtherNet/IP or ControlNet networks, confirm that your cables and connection modules match the network requirements. In some cases, an external gateway or communication module may be needed depending on your existing architecture. Always verify compatibility with your supplier before finalizing the bill of materials.
One important safety note: if you connect or disconnect the serial cable while power is supplied to this module or the serial device at the end of the cable, an electric arc may occur. Remove power first.
Maintenance and Reliability
Periodic inspection keeps the 1768-L43S running reliably. Check panel filters and ensure airflow around the module remains unobstructed. Verify terminal connections are secure during scheduled shutdowns. Because the controller has no moving parts, wear is minimal, but environmental factors like dust and humidity still matter. Keeping the enclosure sealed and within the specified humidity range prevents condensation issues.
Selection Checklist
Before ordering, confirm your application requires the safety memory and integrated motion features of this model. Verify your network architecture supports EtherNet/IP or ControlNet. Check that your panel dimensions accommodate the 5.18 x 3.55 x 4.8 inch footprint. If you need help matching this controller to your existing CompactLogix or GuardLogix system, contact Oil AutoTech today for pricing and availability.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
