ALLEN-BRADLEY 1756-EN2T-B Communication Bridge 1756-EN2T/B A63753

( Brand: Allen-bradley ), ( Manufacturer Part Number: 1756-EN2T/B ), ( Country Of Origin: United States )

Review ALLEN BRADLEY 1756-en2t/b Refurbished Communication Bridge

The **Allen-Bradley 1756-EN2T/B Communication Bridge (Part Number A63753, Model 1756-EN2TB)** is a robust and versatile industrial communication module designed to seamlessly integrate legacy ControlLogix and CompactLogix PLC systems with modern Ethernet-based networks. This high-performance bridge serves as a critical link between traditional ControlNet or DH networks and contemporary Ethernet/IP or CIP-based architectures, ensuring smooth data exchange while maintaining backward compatibility with existing automation infrastructure. Engineered for reliability in demanding industrial environments, the 1756-EN2T/B operates as a transparent gateway, converting and routing communication protocols between the older ControlNet or DH buses and the more widely adopted Ethernet/IP or CIP networks without requiring extensive reprogramming of the PLC logic. Its compact yet durable design, featuring a rugged metal enclosure and industrial-grade connectors, allows for easy installation in control panels or distributed control systems where space and environmental factors are critical considerations.

At its core, the 1756-EN2T/B supports dual-port communication, enabling it to connect to two separate networks simultaneously one for legacy ControlNet or DH and another for Ethernet/IP or CIP while efficiently managing data translation between these disparate protocols. This dual-port capability enhances system flexibility, allowing engineers to gradually migrate legacy systems to newer Ethernet-based networks without disrupting ongoing operations. The module s firmware is optimized for low-latency communication, ensuring real-time data transfer essential for applications requiring precise synchronization, such as motion control, process automation, or high-speed manufacturing. Additionally, the 1756-EN2T/B incorporates advanced error detection and recovery mechanisms, including automatic retries and fault isolation, to minimize downtime and enhance overall system resilience.

From a technical standpoint, the 1756-EN2T/B is compatible with a wide range of Allen-Bradley PLC models, including the ControlLogix 556x, 558x, and CompactLogix 53xx, 54xx, and 55xx series, making it an ideal solution for modernization projects in industries such as manufacturing, oil and gas, power generation, and discrete automation. Its integration with Rockwell Automation s Studio 5000 software further simplifies configuration and troubleshooting, as engineers can leverage familiar tools to monitor network traffic, diagnose issues, and optimize performance. The module s support for VLAN tagging and QoS (Quality of Service) prioritization ensures that critical control traffic is given precedence over less time-sensitive data, further enhancing the reliability of industrial communication networks. Whether deployed as part of a phased migration strategy or as a temporary bridge during system upgrades, the 1756-EN2T/B delivers a dependable, high-performance solution for bridging the gap between legacy and modern automation technologies.

### **Pros and Cons of buying a Allen-Bradley 1756-EN2T/B Communication Bridge (Part Number: A63753, Model: 1756EN2TB)**

#### **Pros**

1. **Compatibility with Rockwell Automation Systems**

The 1756-EN2T/B is designed specifically for use with Allen-Bradley PLCs (such as the 1756 series), ensuring seamless integration with existing control networks. It supports Ethernet/IP, a widely used industrial protocol in Rockwell Automation environments.

2. **Ethernet/IP Communication**

Ethernet/IP is a robust, high-speed communication protocol optimized for industrial automation. It provides reliable data transfer, low latency, and support for time-sensitive control applications, making it ideal for manufacturing, process control, and other automation tasks.

3. **Compact and Modular Design**

The device is a compact module that can be installed directly into an Allen-Bradley 1756 series PLC rack (e.g., 1756-A8 or 1756-A16). This modularity allows for easy installation and replacement without requiring additional space or complex wiring.

4. **High Performance and Reliability**

Allen-Bradley products are known for their durability and performance in harsh industrial environments. The 1756-EN2T/B is built to withstand temperature fluctuations, electrical noise, and other challenges commonly found in manufacturing settings.

5. **Support for Multiple Network Topologies**

The module supports various Ethernet/IP network configurations, including star, ring, and linear topologies. This flexibility allows for scalability and adaptability in network design.

6. **Compatibility with Rockwell Software**

The device works seamlessly with Rockwell s Studio 5000, RSLogix 5000, and other programming environments. This ensures compatibility with existing HMI, SCADA, and control software.

7. **Easy Integration with Other Devices**

The 1756-EN2T/B can connect to a wide range of industrial devices, including HMIs, sensors, actuators, and other PLCs, enabling centralized control and monitoring.

8. **Long-Term Availability and Support**

As a legacy but still widely supported product from Rockwell Automation, the 1756-EN2T/B is likely to remain available for maintenance and upgrades for the foreseeable future. Rockwell Automation provides extensive documentation, technical support, and spare parts.

9. **Cost-Effective for Legacy Systems**

For facilities already using Allen-Bradley PLCs, purchasing this module avoids the need for costly upgrades to newer hardware. It provides a cost-effective solution for extending the life of existing systems.

10. **Industrial-Grade Construction**

The module is built to withstand the rigors of industrial environments, including exposure to dust, moisture (within limits), and electrical interference. This makes it suitable for use in factories, plants, and other demanding settings.

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#### **Cons**

1. **Legacy Technology**

The 1756-EN2T/B is part of an older generation of Allen-Bradley products. While it remains functional, newer PLCs and communication modules (e.g., 1756-L7x series) offer enhanced features such as higher data rates, improved security, and support for more modern protocols like CIP Security.

2. **Limited Bandwidth**

Compared to newer Ethernet/IP modules, the 1756-EN2T/B may have lower data throughput limits, which could become a bottleneck in high-speed or high-data-volume applications. Modern modules often support faster Ethernet speeds (e.g., 1000Base-T).

3. **Fewer Advanced Features**

Newer communication modules include additional features such as built-in security (e.g., CIP Security), support for more devices, and integration with cloud-based monitoring systems. The 1756-EN2T/B lacks these modern capabilities.

4. **Potential Compatibility Issues with Newer Software**

While the module works with older versions of Rockwell software, newer iterations of Studio 5000 or FactoryTalk may require additional configuration or drivers. This could lead to minor compatibility challenges during updates or troubleshooting.

5. **Limited Expansion Options**

The 1756 series is not as modular as newer platforms (e.g., CompactLogix or ControlLogix), which offer more flexibility in terms of adding I/O or communication modules. The 1756-EN2T/B is a fixed-function module with no additional expansion ports.

6. **Discontinued or Phased-Out Status**

While the 1756-EN2T/B is still available, Rockwell Automation has shifted focus to newer PLC platforms. This means that long-term availability may depend on third-party suppliers or Rockwell s continued support, which could be less reliable than for actively supported products.

7. **Higher Maintenance Requirements**

Older hardware may require more frequent maintenance to ensure reliability, especially in environments with significant electrical noise or temperature variations. Newer modules often include self-diagnostic features to reduce downtime.

8. **Limited Support for Modern Protocols**

The 1756-EN2T/B primarily supports Ethernet/IP, which is excellent for Rockwell Automation ecosystems but may not integrate as smoothly with non-Rockwell devices using other protocols (e.g., Modbus TCP, PROFINET). Newer modules often include additional protocol support.

9. **Potential for Higher Long-Term Costs**

While the initial purchase price may be reasonable, the lack of advanced features and potential compatibility issues with newer systems could lead to higher long-term costs in terms of software licenses, training, or additional hardware to compensate for limitations.

10. **Dependence on Rockwell s Ecosystem**

The module is tightly integrated with Rockwell Automation s ecosystem. If a facility needs to diversify its automation vendors or adopt open-standard protocols, the 1756-EN2T/B may not be the most flexible or future-proof choice.

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### **Conclusion**

The **Allen-Bradley 1756-EN2T/B** is a reliable and well-suited communication bridge for facilities already using Allen-Bradley PLCs in their control systems. Its strengths lie in its compatibility with Rockwell Automation s ecosystem, robust industrial design, and proven performance in Ethernet/IP networks. For users with existing 1756-series PLCs, this module provides a cost-effective and low-maintenance solution for extending network connectivity without significant upgrades.

However, the module s **legacy status** means it lacks the advanced features, higher bandwidth, and modern security capabilities found in newer communication modules. If a facility is planning to modernize its automation infrastructure, upgrade to a newer PLC platform (e.g., CompactLogix, ControlLogix, or even newer 1756-L7x series modules) may be more beneficial in the long run. Additionally, if the system requires integration with non-Rockwell devices or support for additional protocols, newer modules with broader compatibility may be preferable.

For **short-term or maintenance purposes** in a stable Rockwell Automation environment, the 1756-EN2T/B remains a solid choice. For **long-term scalability, security, or integration with modern systems**, investing in a newer communication module or upgrading the PLC platform would be more strategic.

---

### **Recommendation**

- You are maintaining or upgrading an existing Allen-Bradley 1756-series PLC system.

- Your network primarily consists of Rockwell Automation devices using Ethernet/IP.

- You require a simple, reliable, and cost-effective communication bridge without advanced features.

- You do not foresee major changes to your automation infrastructure in the near future.

- You are planning to modernize your PLC or network infrastructure in the next few years.

- You need higher bandwidth, better security, or support for additional protocols (e.g., Modbus TCP, PROFINET).

- Your facility is expanding to include non-Rockwell devices or cloud-based monitoring.

- You want to take advantage of newer features such as CIP Security, improved diagnostics, or faster Ethernet speeds.

For most **new installations or long-term projects**, evaluating newer Allen-Bradley communication modules (e.g., 1756-L7x series) or other modern PLC platforms would be a more future-proof decision. However, for **legacy systems where the 1756-EN2T/B fits seamlessly**, it remains a practical and dependable option.

Details:

REFURBISHED ALLEN BRADLEY A 1756-EN2T/B COMMUNICATION BRIDGE A63753 1756EN2TB, 3008/BF, NEW ITEM # 3/BF # 3/BF.

part #: 1756en2t prices

• $400.00-$999.00

specifications sensoindustria:

• brand: Allen-bradley
• mpn: 1756-en2t/b
• country of origin: United States

payments sensoindustria:

• credit card: Discover
• wallet: Paypal
• other

returns sensoindustria:

• time: 60 Days
• method: Money back
• paid by: Seller
• policy: Returns Accepted

shipping sensoindustria:

• cost: $15.79
• service: UPS Ground
• transit: 3-5 Days
• class: Standard
• carrier: UPS
• type: Calculated

general sensoindustria:

• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules
• condition: Seller refurbished

seller sensoindustria:

• # reviews: 27136
• city: Yale, Michigan
• rating: 100.0%

offer sensoindustria:

• started: March 13, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home
• quantity: 1

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