Allen-Bradley 1756-N2 ControlNet Module | Redundant Media, 5 Mbps, 99 Node Capacity Specs

Allen-Bradley 1756-N2 ControlNet Module | Redundant Media, 5 Mbps, 99 Node Capacity Specs

Allen-Bradley 1756-N2 ControlNet communication module specifications. Redundant media, 5 Mbps, 99 node capacity, IP20 protection. For industrial network communication and control.

Product Overview

The Allen-Bradley 1756-N2​ is a ControlNet communication module​ from the ControlLogix series, designed for high-performance industrial network communication. This module provides dual-redundant media support, operates at 5 Mbps network speed, and supports up to 99 nodes​ on a single network. The "1756" designation indicates the ControlLogix module series, "N2" specifies the ControlNet communication module version 2. This module enables deterministic, real-time communication between ControlLogix controllers, I/O devices, and other ControlNet compatible equipment in industrial automation systems.

Technical Specifications

Note: Specifications are based on Allen-Bradley 1756 series technical documentation. The "1756-N2" model specifically indicates ControlNet communication module version 2. Actual specifications may vary slightly depending on production batch.

Model Number Decoding (1756-N2)

• 1756:​ Series designation (ControlLogix module series)

• N2:​ Module type (N = ControlNet, 2 = Version 2.0)

Note:​ The "N" prefix indicates ControlNet communication functionality. The "2" suffix specifies Version 2.0 of the ControlNet module. This module is designed for use in ControlLogix chassis (1756-A4, A7, A10, A13, A17) and requires a ControlLogix processor for operation.

Key Features

• Dual-Redundant Media:​ Supports redundant coaxial or fiber optic media for high availability

• Deterministic Communication:​ Guaranteed network performance with scheduled bandwidth

• High-Speed Network:​ 5 Mbps network speed for real-time control

• Large Network Capacity:​ Supports up to 99 nodes per network

• Flexible Topology:​ Supports trunkline/dropline, star, and tree topologies

• Multiple Connection Types:​ Supports I/O, produced/consumed tags, and explicit messaging

• Network Scheduling:​ Configurable network update time (NUT) for optimized performance

• Status Indicators:​ Comprehensive LED status indication for module and network health

• Industrial Grade:​ Designed for harsh industrial environments

• High Isolation:​ 500V AC isolation for network protection

• International Certifications:​ Multiple agency approvals for global use

Network Performance

Typical Applications

• Distributed Control Systems:​ Real-time control across multiple controllers

• High-Speed Motion Control:​ Coordinated motion across multiple axes

• Process Automation:​ Synchronized control of multiple process areas

• Material Handling:​ Coordinated conveyor and sorting systems

• Automotive Manufacturing:​ Production line control with deterministic timing

• Packaging Machinery:​ Synchronized multi-machine packaging lines

• Semiconductor Manufacturing:​ Precision timing for wafer handling

• Power Generation:​ Plant-wide control and monitoring

• Water/Wastewater:​ Distributed process control

• Oil and Gas:​ Pipeline and process control systems

Important Technical Notes

1. System Requirements:​ Requires ControlLogix chassis and ControlLogix processor. Must be configured with RSNetWorx for ControlNet software.

2. Network Planning:​ Requires detailed network planning including node addresses, NUT configuration, and scheduled bandwidth allocation.

3. Media Selection:​ Supports both coaxial (RG-6 quad shield) and fiber optic media. Media must be properly terminated and grounded.

4. Network Configuration:​ Network must be scheduled using RSNetWorx software before operation. Unscheduled changes can disrupt network operation.

5. Node Addressing:​ Each node requires unique address (1-99). Address 0 is reserved for programming device.

6. Redundancy:​ For redundant media applications, both media paths must be properly installed and terminated.

7. Power Requirements:​ Ensure adequate backplane power for module operation. High connection counts increase power consumption.

8. Environmental Conditions:​ Install in appropriate enclosure for protection. IP20 provides limited protection against dust and moisture.

9. Network Diagnostics:​ Built-in diagnostics and status indicators help troubleshoot network issues. Monitor network utilization for optimal performance.

10. Compatibility:​ Compatible with other ControlNet devices (1794, 1771, 1769 series) with proper adapters and configuration.

Note: For complete installation guidelines, wiring diagrams, configuration instructions, and detailed technical data, consult the official Allen-Bradley 1756 Series Technical Manual. Always verify the exact model number configuration with the manufacturer, as notation variations may occur.