ALLEN BRADLEY 845G-NXC7985-CW Automation

( Brand: Allen Bradley ), ( Manufacturer Part Number: 845G-NXC7985-CW )

Review ALLEN BRADLEY 845gnxc7985cw Used

The **Allen-Bradley 845G-NXC7985-CW** is a high-performance, industrial-grade **CompactLogix 845 Controller** designed to deliver robust automation solutions for demanding manufacturing, process control, and discrete applications. Part of Rockwell Automation s next-generation **CompactLogix NX series**, this controller combines advanced processing power, enhanced connectivity, and a compact form factor to streamline control system integration while maximizing efficiency and reliability. Engineered with a **1.5 GHz dual-core processor**, the 845G-NXC7985-CW ensures rapid execution of control logic, real-time data processing, and seamless communication with field devices, PLCs, and enterprise systems. Its **128 MB of user memory** provides ample space for complex control programs, while the **1 GB of non-volatile memory** ensures data retention even during power interruptions, reducing downtime and safeguarding critical configurations.

This controller features a **CIP (Common Industrial Protocol) Ethernet port**, enabling high-speed, deterministic communication with other Rockwell Automation devices, including **ControlLogix, PowerFlex drives, and Studio 5000 software**, while also supporting **Modbus TCP, EtherNet/IP, and CIP Sync** for synchronized motion control. The **CW (CIP Wireless) module** integrated into this model expands connectivity options by enabling secure, wireless communication with other wireless-enabled devices, facilitating flexible and scalable network architectures without the constraints of wired infrastructure. With **12 digital I/O points (8 DI 4 DO)** and **2 analog input channels (0 10 VDC or 4 20 mA)**, the 845G-NXC7985-CW is well-suited for applications requiring direct interfacing with sensors, actuators, and industrial devices, offering precise control over process variables.

Built to withstand the rigors of industrial environments, this controller is housed in a **durable, IP65-rated enclosure**, protecting against dust, water, and harsh operating conditions. Its **wide operating temperature range (-20 C to 60 C)** ensures reliable performance in diverse climates, from cold storage facilities to high-temperature manufacturing plants. The **CompactLogix NX architecture** incorporates advanced features such as **deterministic timing, enhanced security protocols (including TLS 1.2 for encrypted communications), and support for Rockwell s **Studio 5000 Logix Designer software**, simplifying programming, debugging, and remote monitoring. Whether deployed in a new automation project or as part of a retrofitted system, the **845G-NXC7985-CW** delivers a balance of performance, flexibility, and ease of integration, making it an ideal choice for engineers and technicians seeking a future-proof control solution.

The **Allen-Bradley 845G-NXC7985-CW** is a compact, programmable logic controller (PLC) designed for industrial automation. Below is a detailed analysis of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the Allen-Bradley 845G-NXC7985-CW**

1. **Compact and Space-Efficient Design**

The 845G series is part of Rockwell Automation s compact PLC line, making it ideal for applications with limited panel space. Its small footprint allows for easier integration into existing control panels or tight installations.

2. **High Performance and Speed**

The NXC7985-CW model features a **7985-CW** processor, which provides high-speed processing capabilities. It supports **real-time control** with fast scan times, making it suitable for applications requiring precise timing, such as motion control or high-speed sequencing.

3. **Modular and Scalable Architecture**

The 845G series supports **modular I/O expansion**, allowing users to add input/output modules as needed. This scalability ensures the system can grow with the application s requirements without a complete replacement.

4. **Compatibility with Studio 5000 Software**

The PLC is fully compatible with **Rockwell Automation s Studio 5000** platform, including **Studio 5000 Logix Designer** for programming. This ecosystem provides robust tools for ladder logic, structured text, function block diagrams, and other programming languages.

5. **Reliability and Durability**

Allen-Bradley PLCs are known for their **industrial-grade reliability**, with robust construction to withstand harsh environments. The 845G series is designed for **extended operational lifespans**, reducing downtime and maintenance costs.

6. **Built-in Communication Capabilities**

The model includes **EtherNet/IP** and **DeviceNet** ports, enabling seamless integration with other automation devices, HMIs, and enterprise systems. This facilitates **industrial networking** and remote monitoring.

7. **Energy Efficiency**

The compact design and optimized power consumption make it a **cost-effective** choice for applications where power usage is a concern.

8. **Support for Advanced Features**

The 7985-CW processor supports **high-speed counters, PWM outputs, and advanced timing functions**, making it suitable for applications like **servo control, CNC machines, or packaging systems**.

9. **Easy Installation and Maintenance**

The **plug-and-play** nature of the 845G series simplifies installation, and its modular design makes troubleshooting and maintenance easier compared to monolithic PLCs.

10. **Strong Industry Support and Documentation**

Rockwell Automation provides extensive **technical documentation, training resources, and customer support**, ensuring that engineers can quickly resolve issues or optimize performance.

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### **Cons of the Allen-Bradley 845G-NXC7985-CW**

1. **Limited Memory Capacity**

While the 7985-CW processor offers good performance, its **memory capacity may be restrictive** for very large control programs or applications requiring extensive data logging. Users may need to invest in additional memory modules or external storage.

2. **Higher Upfront Cost Compared to Entry-Level PLCs**

The 845G series is positioned as a **mid-to-high-end PLC**, meaning it is more expensive than basic PLCs from competitors like Siemens, Mitsubishi, or even some Allen-Bradley compact models (e.g., 1769 series). This could be a barrier for small businesses or budget-conscious projects.

3. **Dependence on Rockwell s Software Ecosystem**

While Studio 5000 is powerful, it requires **licensing costs** and may not be as intuitive for engineers unfamiliar with Rockwell s software. Alternatives like **CodeSys or TwinCAT** (used with other PLC brands) might offer more flexibility for some applications.

4. **Potential Learning Curve for New Users**

The **NX architecture** (used in the 845G series) is newer than traditional Logix-based PLCs, which some engineers may find less familiar. Training may be required to fully utilize its features.

5. **Limited Analog Input/Output Options in Base Model**

The base 845G model may not include sufficient **analog I/O channels** for applications requiring high-resolution analog control. Additional modules would need to be purchased, increasing costs.

6. **Vendor Lock-In Risks**

As with all Rockwell Automation products, there is a **risk of vendor lock-in**, particularly with proprietary software and communication protocols. This could complicate future upgrades or migrations to other automation platforms.

7. **Physical Size Still Requires Panel Space**

While compact, the 845G series is not as tiny as some micro PLCs (e.g., Allen-Bradley CompactLogix in very small form factors). In extremely space-constrained applications, alternative solutions may be needed.

8. **Limited Global Availability of Spare Parts**

Depending on the region, **spare parts and support** for the 845G series may not be as readily available as for more established PLC lines, potentially affecting maintenance in remote or less developed areas.

9. **No Built-in Safety Functionality (Unless Paired with Safety Modules)**

The 845G-NXC7985-CW does not include **built-in safety features** like SIL or PL ratings. For safety-critical applications, additional **safety-rated modules** (e.g., Allen-Bradley Safety I/O) would be required, adding complexity and cost.

10. **Potential for Overkill in Simple Applications**

For **very basic control tasks** (e.g., simple relay replacement or small motor control), the 845G may offer **more features than necessary**, making it a less cost-effective choice compared to simpler PLCs or even programmable relays.

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### **Conclusion**

The **Allen-Bradley 845G-NXC7985-CW** is a **high-performance, compact PLC** well-suited for applications requiring **real-time control, modular expansion, and integration with Rockwell s automation ecosystem**. Its strengths lie in **speed, reliability, and scalability**, making it ideal for **industrial automation, motion control, and complex sequencing tasks**.

However, its **higher cost, dependence on Rockwell s software, and potential memory limitations** may make it less ideal for **budget-sensitive or simple control applications**. Additionally, engineers unfamiliar with the **NX architecture** may face a learning curve.

For applications where **performance, integration with Studio 5000, and long-term reliability** are critical, the 845G-NXC7985-CW is an excellent choice. For **smaller or simpler projects**, alternatives like the **Allen-Bradley CompactLogix, Siemens S7-1200, or Mitsubishi FX series** may offer better cost-effectiveness.

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### **Recommendation**

- You require **high-speed processing** for motion control, CNC, or complex automation.

- Your application demands **modular I/O expansion** and **scalability** without frequent hardware changes.

- You are already using **Rockwell Automation s Studio 5000 software** and need seamless integration.

- Reliability, **industrial durability**, and **long-term support** are top priorities.

- Your budget allows for a **mid-to-high-end PLC** without compromising on performance.

- Your application is **simple and cost-sensitive**, and a **lower-cost PLC** (e.g., CompactLogix, Siemens S7-1200) would suffice.

- You require **built-in safety features** without additional modules.

- You prefer **open-standard software** (e.g., CodeSys, TwinCAT) over Rockwell s proprietary tools.

- You need **extremely compact dimensions** and are open to micro PLCs or programmable relays.

Ultimately, the **845G-NXC7985-CW is a strong choice for industrial applications where performance and integration matter most**, but careful evaluation of your specific requirements will determine whether it is the best fit for your project.

Details:

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part #: 845gnxc7985 prices

• $101.00-$2000.00

specifications automationjack:

• brand: Allen Bradley
• mpn: 845g-nxc7985-cw

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• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.6%
• # reviews: 2007 68

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• cost: $12.90
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general automationjack:

• condition: Used
• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment

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• quantity: 1
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• started: April 23, 2026
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• availability: In Stock

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