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The Molex SST-SR4-CLX-RLL is a purpose-built communication interface module designed to enable seamless EtherNet/IP connectivity between Allen-Bradley CompactLogix programmable logic controllers (PLCs) and remote I/O devices, drives, HMIs, and other industrial equipment. Developed by Molex (formerly part of the ProSoft Technology portfolio, now integrated under Molex Industrial Solutions), this module functions as an embedded EtherNet/IP scanner or adapter directly within the CompactLogix chassis, eliminating the need for external gateways or protocol converters. The Molex SST-SR4-CLX-RLL supports real-time cyclic data exchange using the Common Industrial Protocol (CIP), ensuring deterministic performance for time-critical automation tasks.
Positioned as a high-density, low-latency communication solution for the Rockwell Automation ecosystem, the Molex SST-SR4-CLX-RLL is compatible with CompactLogix 5370 and 5380 series controllers and mounts directly into the controller’s right-side expansion slot. It leverages Rockwell’s native Logix architecture, allowing engineers to configure it using standard Studio 5000 software—without custom code or third-party drivers. By consolidating network traffic at the controller level, the Molex SST-SR4-CLX-RLL reduces system complexity, lowers cabling costs, and enhances cybersecurity through segmented device-level networks, making it ideal for discrete manufacturing, packaging, and material handling applications.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | SST-SR4-CLX-RLL |
| Manufacturer | Molex (formerly ProSoft Technology) |
| Product Type | EtherNet/IP Communication Module for CompactLogix |
| Compatible Controllers | Allen-Bradley CompactLogix 5370, 5380 series |
| Communication Protocol | EtherNet/IP (Class 1 Implicit Messaging, Class 3 Explicit Messaging) |
| Network Ports | 2 x 10/100 Mbps RJ-45 (integrated switch with daisy-chain capability) |
| Data Update Rate | Configurable down to 2 ms per connection |
| Number of Connections | Up to 32 CIP connections (scanner mode) |
| Power Consumption | 2.5 W typical (supplied via CompactLogix backplane) |
| Operating Temperature | 0°C to +60°C |
| Physical Dimensions | CompactLogix right-slot form factor (～110 mm H × 35 mm W × 85 mm D) |
| Configuration Tool | Studio 5000 Logix Designer (Add-On Profile included) |
Main Features and Advantages
Native integration with Rockwell Automation architecture:
The Molex SST-SR4-CLX-RLL operates as a true extension of the CompactLogix controller, appearing in Studio 5000 as a local I/O module with tag-based addressing. This eliminates complex IP mapping or buffer management—engineers simply read/write tags like any local data. The module supports both scanner (master) and adapter (slave) modes, enabling flexible topologies such as peer-to-peer messaging or centralized control of distributed devices.
The Molex SST-SR4-CLX-RLL operates as a true extension of the CompactLogix controller, appearing in Studio 5000 as a local I/O module with tag-based addressing. This eliminates complex IP mapping or buffer management—engineers simply read/write tags like any local data. The module supports both scanner (master) and adapter (slave) modes, enabling flexible topologies such as peer-to-peer messaging or centralized control of distributed devices.
Dual-port embedded switch for simplified network topology:
Unlike single-port communication modules, the Molex SST-SR4-CLX-RLL includes a built-in managed Ethernet switch, allowing daisy-chaining of downstream devices without external switches. This reduces panel space, power requirements, and points of failure. The ports support auto-negotiation, link status LEDs, and broadcast storm protection—enhancing robustness in electrically noisy factory floors.
Unlike single-port communication modules, the Molex SST-SR4-CLX-RLL includes a built-in managed Ethernet switch, allowing daisy-chaining of downstream devices without external switches. This reduces panel space, power requirements, and points of failure. The ports support auto-negotiation, link status LEDs, and broadcast storm protection—enhancing robustness in electrically noisy factory floors.
Advanced diagnostics and lifecycle support:
The Molex SST-SR4-CLX-RLL provides real-time diagnostics including connection status, packet error counts, and port utilization, all accessible via Studio 5000 or web-based interface. Its firmware is field-upgradable, ensuring compatibility with future Rockwell features like CIP Sync for motion coordination. Additionally, Molex maintains long-term availability commitments, offering engineering support and migration paths for legacy installations.
The Molex SST-SR4-CLX-RLL provides real-time diagnostics including connection status, packet error counts, and port utilization, all accessible via Studio 5000 or web-based interface. Its firmware is field-upgradable, ensuring compatibility with future Rockwell features like CIP Sync for motion coordination. Additionally, Molex maintains long-term availability commitments, offering engineering support and migration paths for legacy installations.
Application Field
The Molex SST-SR4-CLX-RLL excels in discrete and hybrid manufacturing environments where CompactLogix controllers manage high-speed, synchronized processes. In automotive assembly lines, it connects robots, vision systems, and safety I/O over a unified EtherNet/IP network, enabling coordinated sequencing and rapid fault recovery. Similarly, in food and beverage packaging plants, the Molex SST-SR4-CLX-RLL interfaces with fillers, cappers, and labelers—devices that require millisecond-level response times to maintain line speed and product quality.
Material handling systems also benefit from the Molex SST-SR4-CLX-RLL’s daisy-chain capability, using it to link conveyor drives, sortation scanners, and AGV controllers across large distribution centers without intermediate networking hardware. Because the module supports explicit messaging, it can also exchange configuration or diagnostic data with smart devices during non-cyclic phases—enabling predictive maintenance and recipe management. Furthermore, its compliance with ODVA conformance testing ensures interoperability with thousands of EtherNet/IP-certified products, making the Molex SST-SR4-CLX-RLL a versatile, future-ready solution for Industry 4.0 initiatives.
Related Products
SST-PB3-CLX-RLL: PROFIBUS DP master module for CompactLogix—complements SST-SR4-CLX-RLL in hybrid networks with legacy fieldbus devices.
SST-MCC-CLX-RLL: Modbus TCP client/server module for integrating non-Rockwell equipment into CompactLogix systems.
CompactLogix 5380 (e.g., 5069-L330ER): High-performance controller that hosts the SST-SR4-CLX-RLL for scalable automation solutions.
1734-AENT: Allen-Bradley’s own EtherNet/IP adapter for POINT I/O—alternative when using remote I/O instead of direct device integration.
SST-ESW-CLX-RLL: Enhanced version with gigabit ports and advanced security features (if available in roadmap).
Studio 5000 Logix Designer: Required engineering software to configure and monitor the SST-SR4-CLX-RLL.
ProSoft Configuration Builder: Legacy tool (now integrated into Studio 5000) previously used for initial setup of SST-SR4-CLX-RLL.
Installation and Maintenance
Pre-installation preparation: Before installing the Molex SST-SR4-CLX-RLL, confirm that the CompactLogix 5370/5380 controller firmware is compatible (typically v30 or higher). Power down the chassis or ensure hot-swap is enabled in the controller properties. Insert the module firmly into the rightmost expansion slot until it clicks into place. Connect shielded Cat5e or better Ethernet cables to both ports, grounding the shield at the panel entry point to minimize EMI. The Molex SST-SR4-CLX-RLL draws power from the backplane—no external supply is needed.
Maintenance recommendations: During routine checks, observe the dual LED indicators on the Molex SST-SR4-CLX-RLL—solid green indicates link established, flashing shows activity, and amber signals errors. Use Studio 5000 to review module health, including connection timeouts or CRC errors that may indicate cable degradation. If replacement is required, the module retains no user data; simply insert a new unit and re-download the program. Store spares in anti-static packaging away from extreme temperatures to preserve internal flash memory and Ethernet magnetics.
