ALLEN BRADLEY 145476 Discrete Adapter Board 145479

( Brand: Allen Bradley ), ( Manufacturer Part Number: 145476 ), ( Part Type: Adapter Board )

Review ALLEN BRADLEY Used Discrete Input Adapter Board Rev

The **Allen-Bradley 1454-76/1454-79 Discrete Adapter Board (Model 04)** is a high-performance, modular interface module designed to seamlessly bridge discrete I/O signals between PLCs and external devices, ensuring reliable and efficient automation control. Part of Rockwell Automation s robust **1454 Series**, this adapter board is engineered to convert and condition discrete inputs and outputs, making it an essential component for applications requiring precise signal translation, isolation, and filtering. The **Model 04** variant is specifically optimized for **24V DC discrete I/O**, offering a compact yet versatile solution for integrating sensors, relays, switches, and other field devices into Allen-Bradley PLC systems like the **1756, 1769, or 1768 series**.

This adapter board features a **high-density, DIN-rail-mountable design**, allowing for easy installation in control panels, enclosures, or directly on machinery. Its **24-pin connector interface** enables straightforward wiring to external devices, while the **isolated signal conditioning circuitry** ensures protection against voltage spikes, noise, and ground loops, enhancing system reliability in industrial environments. The **discrete inputs** support standard **24V DC signals**, accommodating a wide range of sensors and switches, while the **discrete outputs** provide **24V DC sinking or sourcing** capability, depending on the configuration, to drive relays, indicators, or other actuators. Each input and output channel is individually isolated, reducing the risk of cross-talk and improving overall system stability.

One of the standout features of the **1454-76/1454-79** is its **plug-and-play compatibility** with Allen-Bradley s **ControlLogix, CompactLogix, and Micro800 PLCs**, eliminating the need for extensive custom wiring or additional hardware. The module s **firmware-based configuration** allows for easy setup via **RSLogix 5000 or Studio 5000 software**, where users can define input/output mapping, signal filtering, and debounce settings to match specific application requirements. This flexibility makes it ideal for applications in **manufacturing, process control, HVAC systems, and material handling**, where discrete signal management is critical for automation efficiency.

Built to withstand the demands of industrial environments, the **1454-79** is constructed with **high-grade materials**, including **metal housing and reinforced connectors**, ensuring durability against vibration, dust, and temperature fluctuations within its operating range of **-20 C to 60 C**. The module also incorporates **overvoltage protection** and **short-circuit resistance**, safeguarding both the adapter and connected devices from potential electrical faults. For enhanced diagnostics, the board provides **LED status indicators** for each input/output channel, allowing operators to quickly identify signal status or faults during troubleshooting.

Whether used as a standalone adapter or integrated into a larger I/O expansion system, the **Allen-Bradley 1454-76/1454-79 Discrete Adapter Board (Model 04)** delivers a **reliable, scalable, and high-performance solution** for discrete signal interfacing. Its combination of **modular design, robust isolation, and seamless PLC integration** makes it a preferred choice for engineers and technicians seeking a dependable way to connect discrete devices in modern automation systems. With its **proven compatibility and ease of implementation**, this adapter board continues to be a cornerstone in Rockwell Automation s lineup for discrete I/O applications.

### **Pros and Cons of buying a Allen-Bradley 1454-76/1454-79 Discrete Adapter Board (04)**

1. **Compatibility with PLC Systems** These adapter boards are designed specifically for Allen-Bradley PLCs (such as the SLC 500, PLC-5, or Micro800 series), ensuring seamless integration with existing control systems.

2. **Reliability and Quality** Allen-Bradley is a trusted brand in industrial automation, known for durable and dependable components that minimize downtime.

3. **Standardized Design** The 1454 series is a well-documented and widely used adapter, making troubleshooting and replacement easier compared to lesser-known alternatives.

4. **Widespread Availability** Due to their popularity, these boards are commonly found in stock at industrial suppliers, reducing lead times.

5. **Backward Compatibility** Many newer PLC models support older adapter boards, ensuring long-term usability even if the main controller is upgraded.

6. **Modularity** The adapter board allows for flexible I/O expansion, enabling users to add discrete inputs/outputs without replacing the entire PLC.

7. **Technical Support and Documentation** Rockwell Automation (Allen-Bradley s parent company) provides extensive documentation, manuals, and support resources for these components.

1. **Cost** Compared to generic or aftermarket alternatives, Allen-Bradley components can be more expensive, which may be a concern for budget-conscious buyers.

2. **End-of-Life (EOL) Status** Some older Allen-Bradley models (especially those from the 1990s or early 2000s) may no longer be in active production, though the 1454 series remains widely available.

3. **Compatibility with Newer Systems** While generally compatible, some newer PLC models (e.g., ControlLogix or CompactLogix) may require additional configuration or firmware updates for optimal performance.

4. **Potential for Counterfeit Parts** Due to their age, there is a risk of purchasing counterfeit or refurbished parts that may not meet original specifications. Buying from authorized distributors helps mitigate this risk.

5. **Limited Customization** Unlike some modern I/O modules, these adapter boards offer fixed configurations, meaning users cannot easily modify pin assignments or signal types without additional hardware.

6. **Maintenance and Spare Parts** If the PLC system is no longer supported by Rockwell, finding replacement parts or technical assistance may become more difficult over time.

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### **Conclusion**

The **Allen-Bradley 1454-76/1454-79 Discrete Adapter Board (04)** is a robust, reliable choice for industrial automation applications, particularly when working with legacy or widely used PLC systems. Its strengths lie in compatibility, durability, and ease of integration, making it a preferred option for many engineers and technicians. However, its cost and potential end-of-life concerns should be considered, especially in long-term projects.

For users with **budget constraints or newer PLC systems**, evaluating alternative I/O modules (such as Rockwell s newer 17xx series or third-party options) may be worth exploring. Conversely, if **reliability, compatibility with older systems, and brand trust** are priorities, this adapter board remains a solid investment.

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### **Recommendation**

- **Buy from an authorized distributor** (e.g., Rockwell Automation, Grainger, or industrial electronics suppliers) to ensure authenticity and warranty coverage.

- **Verify compatibility** with your specific PLC model and firmware version before purchasing.

- **Consider refurbished or remanufactured options** if cost is a concern, but ensure they come with a warranty and testing certification.

- **Evaluate long-term needs** if the system will be upgraded soon, assess whether a more future-proof I/O solution would be better.

- **For new installations**, explore newer Allen-Bradley I/O modules (e.g., 1756-I/O series) if budget allows, as they offer enhanced features and longer support lifecycles.

Ultimately, the **1454-76/79 adapter board is a sound choice for maintaining or upgrading legacy systems**, but careful planning ensures it meets both immediate and future requirements.

Details:

Condition: Used. Part#s: 145476 / 145479. Revision: 04 /. Allen Bradley Discrete Input Adapter Board Brand.

Board#: 119711-02.

part #: 145476 prices

• $175.00-$424.99

specifications sensoindustria:

• brand: Allen Bradley
• mpn: 145476
• part type: Adapter Board

shipping sensoindustria:

• transit: 2-5 Days
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• cost: $9.06
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general sensoindustria:

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

offer sensoindustria:

• quantity: 1
• sold: 0
• availability: In Stock
• options: Ship-to-home
• best offers: True
• started: March 26, 2026

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