High-Performance Control for Hazardous and Secure Environments

The Allen Bradley 1769-L30ER-NSE represents a specialized solution within the CompactLogix 5370 L3 controller family. Designed by Rockwell Automation, this “No Stored Energy” (NSE) version caters specifically to industrial environments where stored electrical energy poses a risk or where strict transportation regulations apply. Unlike standard controllers that use supercapacitors to maintain the Real-Time Clock (RTC) during power loss, the 1769-L30ER-NSE eliminates this component, making it an ideal choice for hazardous locations and secure facilities.

Comprehensive Technical Specifications

The 1769-L30ER-NSE combines a compact footprint with the robust processing power required for modern automation.

• Manufacturer: Allen Bradley / Rockwell Automation
• Product Line: CompactLogix 5370 L3
• Part Number: 1769-L30ER-NSE
• User Memory: 1 MB
• EtherNet/IP Nodes: Supports up to 16 nodes
• Local I/O Expansion: Up to 8 Compact I/O (1769) modules
• Communication Ports: Dual EtherNet/IP ports; 1 USB Client port
• Power Dissipation: 4.5 Watts
• Current Draw: 500 mA @ 5V DC
• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage: Includes 1GB SD card (supports up to 2GB)
• Weight: Approximately 2 lbs (0.91 kg)
• Dimensions: 11 x 8 x 6 inches (Shipping dimensions)

Advanced Networking and Connectivity

The 1769-L30ER-NSE features dual EtherNet/IP ports with an embedded switch. This hardware configuration allows users to implement various network topologies without the need for additional external switches.

1. Device Level Ring (DLR): The controller supports DLR topologies, providing high network resiliency. If a single point in the ring fails, the network continues to operate, ensuring minimal downtime for critical processes.
2. Linear and Star Topologies: Users can easily integrate the controller into standard linear or star-based Ethernet architectures.
3. Simplified Addressing: Despite having two physical ports, the module uses a single IP address, which simplifies network configuration and management.

The “No Stored Energy” (NSE) Advantage

The “NSE” designation is the most significant feature of the 1769-L30ER-NSE. Standard 5370 L3 controllers utilize a supercapacitor to preserve the RTC and certain volatile data during a power cycle. However, the 1769-L30ER-NSE removes this capacitor. This design choice offers several benefits:

• Hazardous Area Compliance: It meets stringent safety requirements for environments where stored energy might trigger sparks or explosions.
• Easier Transportation: Without large capacitors or lithium batteries, this unit bypasses many restrictive shipping regulations for electronic components.
• Maintenance Free: Users do not need to worry about the degradation of energy storage components over long-term operation.

Scalable Performance and Programming

This controller handles complex automation tasks with ease. It supports up to 32 simultaneous tasks, and each task can execute up to 1000 programs. With 256 supported connections, the 1769-L30ER-NSE manages extensive data exchange between human-machine interfaces (HMI), drives, and other PLCs.

The integrated USB port serves primarily as a local programming interface. Engineers can quickly connect a laptop to download firmware, upload code, or perform real-time diagnostics. The inclusion of a 1GB industrial-grade SD card ensures that the project and data logs remain secure even without a supercapacitor.

Installation and Hardware Compatibility

The 1769-L30ER-NSE mounts easily on a standard DIN rail or through panel mounting. It typically sits adjacent to the system power supply. The module utilizes the 1769-RTBN18 replacement terminal block and supports a variety of wire sizes:

• Solid Wire: 22-14 AWG
• Stranded Wire: 22-16 AWG

This flexibility ensures secure electrical connections using standard copper wiring rated for 90 degrees Celsius. Its vibration and shock resistance meet industry standards, ensuring the CPU operates reliably in heavy industrial settings.