ALLEN-BRADLEY 1771-DB-B Module 1771-DB/B 95678702

( Brand: Allen-bradley ), ( Manufacturer Part Number: 1771-DB/B ), ( Type: Plc Output Module ), ( Unit Type: Unit ), ( Country Of Origin: United States )

Review ALLEN BRADLEY 1771-db/b Series Rev Basic Module

The **Allen-Bradley 1771-DB/B 95678702** is a high-performance, modular **1771 Data Bus (DB) module** designed to integrate seamlessly into Rockwell Automation s **CompactLogix, ControlLogix, and other PLC-based control systems** through the **1771 Data Highway Plus (DH )** network. This **95678702 module** operates as a **1771-DB/B (Data Bus/Branch) device**, enabling reliable, high-speed communication between multiple PLCs, I/O modules, and other industrial automation components across extended distances. Built with **Allen-Bradley s robust industrial-grade construction**, it features a **compact, DIN-rail-mountable form factor** that ensures easy installation in control panels, enclosures, or distributed control environments.

The **1771-DB/B 95678702** module supports **full-duplex, token-passing communication** over the **Data Highway Plus network**, allowing for **deterministic data transfer** with minimal latency critical for applications requiring precise synchronization, such as **motion control, process automation, or synchronized I/O updates**. With a **maximum network speed of 1.5 Mbps**, it efficiently handles high-volume data exchanges, including **tag updates, control signals, and diagnostic information**, while maintaining **redundancy and fault tolerance** through its **DH ring or linear topology** capabilities. This ensures continuous operation even in the event of a network segment failure, making it ideal for **mission-critical applications** where uptime is non-negotiable.

Designed for **industrial harshness**, the **95678702 module** operates within a **temperature range of -20 C to 60 C (-4 F to 140 F)**, with **extended temperature options available** for applications in extreme environments. Its **isolated, galvanically separated communication interface** protects against electrical noise and voltage spikes, ensuring stable performance in **factory floors, oil and gas refineries, or power generation facilities**. The module also incorporates **built-in diagnostics**, including **link status indicators, error codes, and self-test capabilities**, which allow operators to quickly identify and resolve network issues without disrupting production.

From a **functional perspective**, the **1771-DB/B 95678702** serves as a **bridge between PLCs and distributed I/O systems**, enabling **real-time data sharing** across multiple control nodes. It supports **up to 32 devices per network segment** (depending on cable length and topology) and can be configured for **either a linear or ring topology**, providing flexibility in network design. The module s **compatibility with Rockwell s Studio 5000, RSLogix 5000, and other automation software** ensures seamless integration with modern control systems, allowing engineers to **monitor, configure, and troubleshoot** the network through intuitive graphical interfaces. Additionally, its **backward compatibility** with legacy **1771-DB modules** makes it a reliable upgrade path for existing installations.

For **maintenance and reliability**, the **95678702** features a **hot-swappable design**, allowing for **in-field replacement without disrupting network operation**. Its **low-power consumption** (typically **

In summary, the **Allen-Bradley 1771-DB/B 95678702** is a **highly reliable, industrial-grade Data Highway Plus module** that excels in **real-time data communication, network redundancy, and seamless integration** with Rockwell Automation s control systems. Its **durable construction, diagnostic capabilities, and deterministic performance** make it an essential component for **modern industrial automation**, ensuring efficient, synchronized control across complex and distributed systems.

### **Pros and Cons of buying a Allen-Bradley 1771-DB/B 95678702 Module**

1. **Compatibility with PLC Systems** This is a high-performance digital input/output (I/O) module designed specifically for Allen-Bradley CompactLogix, ControlLogix, and other Rockwell Automation PLC systems. It integrates seamlessly with these platforms, reducing compatibility issues.

2. **High-Speed Data Acquisition** The module supports fast scan rates, making it suitable for applications requiring real-time data processing, such as motion control, process automation, or high-speed manufacturing.

3. **Reliable and Durable Construction** Allen-Bradley modules are known for their robust build quality, resistance to environmental factors (within specified limits), and long-term reliability in industrial settings.

4. **Scalability** The 1771-DB/B series is part of a modular family, allowing for easy expansion of I/O configurations as system requirements grow.

5. **Support for Advanced Features** The module supports features like **scan-based I/O, event-driven I/O, and high-speed counters**, which are useful for complex automation tasks.

6. **Widely Available Parts** As a legacy but still widely used module, spare parts, documentation, and technical support are relatively easy to find, especially from authorized Rockwell dealers or third-party suppliers.

7. **Proven Performance in Industrial Environments** Allen-Bradley modules are designed to withstand typical industrial conditions, including temperature fluctuations, electrical noise, and vibration (within specified limits).

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1. **Legacy Technology** While still functional, this module is part of an older generation of Allen-Bradley I/O products. Newer alternatives (such as the **1756-I/O modules** or **CompactLogix/ControlLogix-compatible modules**) may offer improved features, better integration with modern software, or enhanced diagnostics.

2. **Limited Software Support** Some newer versions of **RSLogix 5000, Studio 5000, or FactoryTalk** may have reduced optimization for older modules, potentially requiring additional configuration effort.

3. **Potential Obsolescence Risks** Rockwell Automation occasionally discontinues older modules, which could lead to future supply chain issues or higher costs for replacements. Always verify availability before purchasing.

4. **Higher Cost Compared to Newer Alternatives** While not excessively expensive, newer I/O modules may offer better performance per dollar, especially if they include built-in diagnostics, Ethernet/IP integration, or higher channel densities.

5. **Compatibility with Older Firmware** If using very old PLC firmware, some features of the 1771-DB/B may not be fully supported, requiring manual workarounds.

6. **Limited Expansion Options** Unlike newer modules, this one may not support the latest communication protocols (e.g., advanced Ethernet/IP features) or integrated safety functions.

7. **Physical Size and Installation Constraints** The module s form factor may require careful rack or panel space planning, especially in compact automation setups.

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### **Conclusion**

The **Allen-Bradley 1771-DB/B 95678702** is a **reliable, well-tested module** that remains a solid choice for applications where **backward compatibility with older Rockwell PLC systems** is critical. It excels in **high-speed digital I/O tasks** and continues to perform well in industrial environments where legacy systems are still in use.

However, if **long-term scalability, modern software integration, or cost efficiency** are priorities, newer alternatives (such as **1756-I/O modules or newer CompactLogix/ControlLogix I/O**) may be preferable. The decision ultimately depends on:

- **Current system compatibility** (if the module must work with an existing legacy setup).

- **Future-proofing needs** (if the system will be upgraded or expanded).

- **Budget constraints** (newer modules may offer better value in the long run).

---

### **Recommendation**

- You are maintaining or upgrading an **existing Rockwell Automation system** that requires this specific module.

- The application demands **high-speed digital I/O** and the module fits within your current infrastructure.

- You have **verified availability** and are prepared for potential future supply chain risks.

- You are starting a **new project** and want the latest features (e.g., better diagnostics, Ethernet/IP enhancements).

- You anticipate **long-term system upgrades** and want modules that will remain supported.

- Cost efficiency is a priority, as newer modules may offer better performance for similar or lower prices.

Before purchasing, **confirm compatibility with your PLC firmware, check for availability from authorized suppliers, and evaluate whether a newer module could serve your needs without breaking existing integrations.** If the module is already in use and working reliably, there is little downside to continuing with it just ensure you have spare parts on hand.

Details:

The unit may show slight signs of cosmetic wear from the previous owner such as scratching, discoloration, shelf wear, paint chipping and/or other markings that should not impact units performance. Module, For sale is a Allen-Bradley 1771-DB/B Series B Rev C 95678702 Basic Module. The unit appears to be in used condition. The unit includes everything shown in photos.

Etch Surplus Rochester, NY, Shipping: Charged according to location.

part #: 1771db prices

• $42.50-$200.00

specifications sensoindustria:

• brand: Allen-bradley
• mpn: 1771-db/b
• type: Plc Output Module
• unit type: Unit
• country of origin: United States

returns sensoindustria:

• policy: Returns Accepted
• time: 30 Days
• method: Money back
• paid by: Seller

seller sensoindustria:

• rating: 100.0%
• city: Rochester, New York
• # reviews: 13835

payments sensoindustria:

• wallet: Google-pay
• credit card: Mastercard
• other

general sensoindustria:

• condition: Used
• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules

shipping sensoindustria:

• class: Standard, Expedited, One-day
• carrier: FedEx
• transit: 2-6 Days
• service: FedEx Ground / FedEx Home Delivery, FedEx 2Day, FedEx Standard Overnight, FedEx Priority Overnight
• cost: $20.49
• type: Calculated

offer sensoindustria:

• started: February 17, 2026
• quantity: 1
• availability: In Stock
• options: Ship-to-home
• sold: 0

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