Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1768-L43S |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Type | Compact GuardLogix Safety Controller (Discontinued) |
| User Memory (Standard) | 2.0 MB |
| Safety Memory (Dedicated) | 0.5 MB |
| Safety Rating | SIL 3 (IEC 61508), PL e (ISO 13849-1) |
| Local Expansion | Max 2x 1768 modules + 16x 1769 I/O modules |
| Communication Ports | 1x RS-232 (serial, isolated) |
| Network Protocols | EtherNet/IP, CIP Safety (via 1768 communication modules) |
| Backplane Current Draw | 2.8 A @ 5V DC; 1.4 A @ 24V DC |
| Power Dissipation | 7.5 W |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Dimensions (H×W×D) | 131.6 × 89.6 × 122.1 mm |
| Weight | ~0.45 kg |
| Mounting | DIN rail or panel mount |
Main Features and Advantages
Integrated standard and safety control: The 1768‑L43S eliminates the need for separate standard PLCs and safety relays by combining both functions in one controller. This reduces panel space, wiring complexity, and engineering effort while providing advanced safety diagnostics through the Logix Designer environment.Compact, scalable architecture: Despite its small footprint, the controller supports a flexible I/O system. It can host two 1768 communication or motion modules and up to sixteen 1769 Compact I/O modules on the local bus, making it suitable for medium-complexity machines.Robust safety certification: The controller meets stringent international safety standards (SIL 3, PL e), making it suitable for applications where personnel protection and high-risk machine functions are critical. It uses a separate safety task with a dedicated run-time engine to ensure deterministic safety response.
Application Field
The 1768‑L43S was historically deployed in machinery requiring integrated safety control within a compact form factor. Typical applications included:
- Packaging machinery: Managing conveyor sequencing, fillers, and palletizers with integrated E‑stop and interlock safety.
- Material handling: Controlling robotic workcells, automated guided vehicles (AGVs), and transfer lines.
- Automotive assembly: Operating small to medium-sized stations with safety-rated light curtains and area scanners.
- Pharmaceutical and food & beverage: Batch processing equipment where safety and standard control are tightly coupled.
Related Products
- 1768‑L43: The non‑safety variant of the same controller (standard control only).
- 1769‑I/O Modules: Compact I/O modules (e.g., 1769‑IA16, 1769‑OB16) used for local expansion.
- 1768‑ENBT / 1768‑EWEB: EtherNet/IP communication modules to add network connectivity.
- 5069‑L306ERS2 / 5069‑L3100ERS2: Modern Compact GuardLogix 5380 series replacements (recommended for new designs).
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