The 1768-L43S controller belongs to the Allen-Bradley Compact GuardLogix product family. It delivers both standard control and safety functionality in a single compact package. Manufacturers choose this module for applications that require reliable machine safety alongside routine automation tasks.
This controller provides 2MB of standard memory for user programs and data. Additionally, it includes 0.5MB of dedicated safety memory for safety-related logic and monitoring. The 1768-L43S works seamlessly with EtherNet/IP or ControlNet networks, offering flexible integration options.
With rackless I/O architecture, the 1768-L43S simplifies installation and reduces cabinet space requirements. Its compact dimensions and lightweight design make it suitable for space-constrained control panels.
The 1768-L43S offers robust technical specifications for demanding safety applications.
Key parameters include:
Manufacturer: Allen-Bradley
Part Number: 1768-L43S
Product Line: Compact GuardLogix
Module Type: Controller (Safety)
Standard Memory: 2 MB
Safety Memory: 0.5 MB
Backplane Current: 1.4 Amps at 24 Volts
Power Consumption: 33.6 Watts maximum
Power Dissipation: 4 to 7.5 Watts
Isolation Voltage: 30 Volts Continuous
Operating Temperature: 0° to +60°C (+32° to +140°F)
Storage Temperature: -4° to +85°C (+25° to +185°F)
Relative Humidity: 5% to 95% non-condensing
Vibration Resistance: 5G at 10 to 500 Hz
Operating Shock: 30G
Non-Operating Shock: 50G
Radiated RF Immunity: 10V/m with 1 kHz sine-wave 80% AM from 80 to 2000 MHz
The 1768-L43S stands out with its dual-memory architecture. The 2MB standard memory handles general control logic, while the 0.5MB safety memory manages critical safety functions.
This separation ensures that safety routines remain isolated from standard operations. The 1768-L43S also includes security controls to protect against unauthorized access. Full integrated motion support allows you to coordinate motion control with safety monitoring.
For system expansion, this controller supports additional memory options. However, the built-in 2MB standard and 0.5MB safety memory typically satisfy most medium-scale safety applications.
The 1768-L43S integrates smoothly with EtherNet/IP and ControlNet networks. These industrial protocols enable high-speed data exchange with HMIs, drives, and other automation devices.
A built-in RS232 serial port provides a direct connection for programming and diagnostics. Use the recommended 1747-CP3 or 1756-CP3 cables for reliable serial communication.
Furthermore, the 1768-L43S includes front-panel status indicators. These LEDs display power, run, fault, and communication status. Operators can quickly assess controller health without connecting a programming terminal.
When working with the 1768-L43S, follow these critical safety guidelines.
Always remove power before connecting or disconnecting the serial cable. An electric arc may occur if you connect or disconnect the cable while power is supplied to the controller or the serial device. This arc could damage the communication port or create a safety hazard.
Additionally, ensure proper clearance around the 1768-L43S for ventilation. Maintain adequate space above and below the module to prevent overheating. The operating temperature range of 0° to 60°C must be observed for reliable performance.
The 1768-L43S measures 5.18 x 3.55 x 4.8 inches (HxWxD) and weighs 15.9 ounces (0.45 kg). Its compact form factor fits easily into standard control cabinets.
Mounting options include DIN rail or panel installation. The rackless I/O design means you do not need a separate backplane chassis. This feature simplifies installation and reduces overall system cost.
For optimal performance, mount the 1768-L43S in a location with minimal vibration. Although the module withstands 5G vibration at 10–500 Hz, excessive shock or vibration could affect long-term reliability.
Each 1768-L43S ships in protective packaging to ensure safe delivery. The package includes the controller module only.
We do not include power supplies, cables, mounting hardware, or programming software. These items must be ordered separately based on your specific system requirements.
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.
1. What is the difference between the 1768-L43S and the standard 1768-L43?
The 1768-L43S adds 0.5MB of dedicated safety memory and safety functionality, while the standard 1768-L43 offers only standard control capabilities.
2. Can the 1768-L43S work on EtherNet/IP networks?
Yes, the 1768-L43S supports both EtherNet/IP and ControlNet networks for flexible system integration.
3. What happens if I disconnect the serial cable while powered?
An electric arc may occur. Always remove power from the 1768-L43S and the serial device before connecting or disconnecting cables.
4. Does the 1768-L43S support motion control?
Yes, this controller includes fully integrated motion support for coordinated motion and safety applications.
5. What are the vibration limits for the 1768-L43S?
The 1768-L43S withstands 5G vibration at frequencies from 10 to 500 Hz under normal operating conditions.
| Brand Name | |
| Model No. | 1768-L43S |
| Product Type | Controller |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
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