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Description
Application Scenarios
A packaging machinery manufacturer in the Midwest was struggling with complex control cabinets that housed separate standard PLCs, safety relays, and wiring for emergency stops and light curtains across multiple machine stations. The cabinet footprint was consuming valuable floor space, and troubleshooting safety circuits required tracing dozens of relay contacts. By switching to the 1768-L43S, the manufacturer consolidated all control and safety logic into a single processor. The safety task in RSLogix 5000 handled all safety functions—including safety stop, safety gate monitoring, and speed limiting—while the standard task managed motion control and production sequencing. Cabinet space was reduced by 40%, and the integrated safety solution shortened commissioning time from three weeks to just ten days.
This scenario demonstrates why the 1768-L43S is the preferred choice for machine builders and system integrators who need to meet ISO 13849-1 and IEC 61508 standards while minimizing system complexity. The controller’s 1oo2 safety architecture ensures that a single failure will not compromise safety integrity, providing the reliability demanded by high-risk automation environments-5.
Parameters
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1768-L43S |
| Manufacturer | Allen-Bradley / Rockwell Automation-2-4 |
| Product Category | Compact GuardLogix Integrated Safety Controller-1-4 |
| Standard Memory | 2.0MB – sufficient for mid-range machine logic applications-2-10 |
| Safety Memory | 0.5MB – dedicated for safety control tasks-5-10 |
| Safety Certification | SIL 3 (IEC 61508), PL e (ISO 13849-1), Cat. 4-4-5 |
| Safety Architecture | 1oo2 (one-out-of-two) – ensures fault tolerance-5 |
| Communications | Embedded 10/100 Mbps EtherNet/IP port supporting CIP Safety-4-12 |
| Local I/O Support | Up to 30 local 1769 Compact I/O modules (including safety I/O)-4-10 |
| Dimensions (HxWxD) | 131.6 × 90 × 121.8 mm (5.18 × 3.55 × 4.80 in.)-9 |
| Weight | Approx. 0.45 kg (15.9 oz)-9-11 |
| Operating Temperature | 0 to 60 °C (32 to 140 °F)-2-4 |
| Power Dissipation | 4.0 to 7.5 W-9 |
| Backplane Current | 1.4 A @ 24V DC; delivers 2.8 A @ 5.2V to 1768 backplane-10 |
| Programming Software | RSLogix 5000, version 18 or later (B Series)-1-6 |
Technical Principles and Innovative Values
Innovation Point 1: Integrated Standard and Safety Control Engines
The 1768-L43S features a dual-engine architecture that runs standard control tasks and safety control tasks independently yet concurrently within a single processor-5-12. This eliminates the need for a separate safety PLC or hardwired safety relays, reducing hardware costs and cabinet space. The safety task is automatically created with built-in tools that restrict users to safety-approved function blocks, preventing unintended logic errors that could compromise safety-5.
Innovation Point 2: 1oo2 Safety Architecture with SIL 3 Certification
Unlike standard controllers that provide no fault tolerance, the 1768-L43S utilizes a one-out-of-two (1oo2) architecture, meaning two independent processors continuously compare safety-related outputs-5. If they disagree, the system enters a safe state. This architecture enables SIL 3 certification, making the controller suitable for the highest industrial safety levels without requiring redundant external hardware-4-5.
Innovation Point 3: CIP Safety over EtherNet/IP
The 1768-L43S leverages standard EtherNet/IP infrastructure to transmit safety-critical data using the CIP Safety protocol-4-12. This means safety I/O and standard I/O can coexist on the same network, simplifying wiring and reducing installation costs. The controller supports communication with distributed safety I/O modules such as POINT Guard I/O and ArmorBlock Guard I/O through the embedded Ethernet port-5-10.
