ALLEN BRADLEY 100-C40EJ400 Automation

( Brand: Allen Bradley ), ( Manufacturer Part Number: 100-C40EJ400 )

Review ALLEN BRADLEY 100c40ej400 Used

The **Allen-Bradley 100-C40EJ400** is a high-performance, industrial-grade **CompactLogix 100** programmable logic controller (PLC) designed to deliver robust automation solutions for demanding manufacturing, process control, and industrial applications. Part of Rockwell Automation s **CompactLogix** series, this PLC is engineered to provide reliable, scalable, and flexible control capabilities while integrating seamlessly with other Allen-Bradley products and third-party systems. The **100-C40EJ400** features a **40-point digital I/O module** with a mix of **24V DC inputs and outputs**, making it ideal for applications requiring discrete control of sensors, relays, solenoids, and other binary devices. Its **EJ400 designation** indicates a **high-performance, enhanced I/O module** with improved signal conditioning, noise immunity, and faster response times compared to standard models, ensuring stable operation in electrically noisy environments such as those found in motor control, conveyor systems, or material handling applications.

This PLC module is housed in a **durable, industrial-grade enclosure** designed to withstand harsh conditions, including temperature fluctuations, vibration, and humidity, making it suitable for both indoor and outdoor installations in factories, warehouses, and process plants. The **CompactLogix 100** architecture leverages **EtherNet/IP** for high-speed, deterministic communication, enabling real-time data exchange with other controllers, HMIs, drives, and enterprise systems. This networking capability allows for seamless integration with **Studio 5000**, Rockwell s comprehensive engineering software, which simplifies programming, debugging, and monitoring through a user-friendly interface. The **100-C40EJ400** supports **ladder logic (LAD), structured text (ST), function block diagrams (FBD), and sequential function charts (SFC)**, providing engineers with multiple programming options to suit their application requirements.

One of the standout features of this module is its **compact yet powerful design**, which allows for easy installation in tight spaces while maintaining high performance. The **24V DC I/O** is optimized for compatibility with a wide range of industrial sensors and actuators, reducing the need for additional isolation or signal conditioning hardware. Additionally, the module supports **isolated inputs and outputs**, enhancing safety by preventing ground loops and protecting against voltage spikes, which is critical in applications involving high-power machinery or variable electrical loads. The **100-C40EJ400** also benefits from **Allen-Bradley s reputation for reliability**, with components built to last under continuous operation, minimizing downtime and maintenance costs.

For applications requiring advanced functionality, the **CompactLogix 100** platform supports **motion control, safety logic, and advanced process control** through optional modules and software extensions. This makes the **100-C40EJ400** a versatile choice for automating everything from simple discrete control tasks to complex, multi-axis motion sequences in packaging, robotics, or CNC machining. Whether deployed as part of a larger control system or as a standalone solution, this PLC module delivers **high-speed processing, deterministic timing, and seamless integration** with Rockwell s ecosystem of automation products, ensuring efficient, precise, and scalable industrial automation.

### **Pros and Cons of buying a Allen-Bradley 100-C40EJ400 (CompactLogix 100 Series, Model C40EJ400)**

1. **High Performance and Reliability**

The CompactLogix 100 series is known for its robust industrial-grade construction, designed to withstand harsh environments. The C40EJ400 model, in particular, offers high-speed processing and deterministic control, making it suitable for demanding automation applications.

2. **Scalability and Flexibility**

This controller is part of Rockwell Automation s scalable CompactLogix family, allowing for easy expansion with additional I/O modules, communication ports (EtherNet/IP, DeviceNet, etc.), and support for advanced features like motion control and safety.

3. **EtherNet/IP Communication**

Built-in EtherNet/IP connectivity enables seamless integration with other Rockwell Automation products (e.g., Studio 5000, FactoryTalk View, or other PLCs) and third-party devices, simplifying networked automation setups.

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

The C40EJ400 is part of the "EJ" series, which features a more compact footprint compared to traditional CompactLogix models. This makes it ideal for installations where space is limited.

5. **Support for Advanced Features**

The controller supports high-speed counter inputs, pulse-width modulation (PWM) outputs, and advanced communication protocols, making it versatile for applications requiring precise timing or motion control.

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

As a widely used model in Rockwell s product line, the C40EJ400 benefits from extensive documentation, community support, and ongoing software updates, ensuring longevity in industrial applications.

7. **Compatibility with Rockwell Software**

Works seamlessly with **Studio 5000 Logix Designer**, **FactoryTalk View**, and other Rockwell tools, reducing development time and improving maintainability.

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1. **Higher Upfront Cost**

Compared to some alternative PLC brands (e.g., Siemens, Mitsubishi, or smaller Chinese manufacturers), the Allen-Bradley CompactLogix series can be more expensive, especially when purchasing new.

2. **Limited Analog Input/Output Capacity**

The base model (C40EJ400) has a fixed number of digital I/O points and analog channels. For applications requiring extensive analog inputs/outputs, additional modules may be necessary, increasing complexity and cost.

3. **Learning Curve for New Users**

Rockwell Automation s software ecosystem (e.g., Studio 5000) can be complex for beginners, requiring training to fully utilize its capabilities. This may introduce delays in programming and troubleshooting.

4. **Dependence on Rockwell Ecosystem**

While EtherNet/IP is a robust protocol, it is proprietary to Rockwell. Integration with non-Rockwell systems may require additional gateways or converters, adding potential compatibility issues.

5. **Potential for Obsolescence**

Rockwell Automation occasionally updates or discontinues product lines. While the C40EJ400 is still supported, future software updates or hardware replacements may require migration to newer models.

6. **Physical Size Constraints**

Although more compact than traditional CompactLogix models, the C40EJ400 still requires proper mounting and cooling, which may limit its use in extremely space-constrained environments.

7. **Licensing Costs for Advanced Features**

Some advanced functionalities (e.g., high-speed motion control, safety features) may require additional licensing or optional modules, increasing the total cost of ownership.

---

### **Conclusion**

The **Allen-Bradley 100-C40EJ400** is a strong choice for industrial automation applications requiring **reliable, high-performance control with EtherNet/IP connectivity**. Its compact design, scalability, and compatibility with Rockwell s software ecosystem make it ideal for mid-sized control systems where determinism and integration are critical.

However, its **higher cost, proprietary nature, and potential complexity** may make it less suitable for budget-conscious projects or applications where alternative PLC brands offer comparable performance at a lower price.

### **Recommendation**

- You are already invested in Rockwell Automation s ecosystem (e.g., using Studio 5000, FactoryTalk View, or other Allen-Bradley products).

- Your application requires **EtherNet/IP communication, high-speed I/O, or deterministic control**.

- You prioritize **long-term reliability, support, and scalability** over cost savings.

- Space constraints make a more compact PLC model advantageous.

- Budget is a major constraint (explore Siemens S7-1200, Mitsubishi FX or Q series, or smaller PLC brands).

- You need **extensive analog I/O or motion control** without additional modules.

- Your system requires **open-standard communication** (e.g., Modbus, Profibus) and is not Rockwell-centric.

For most **mid-to-large industrial automation projects** where Rockwell compatibility is a priority, the **C40EJ400 remains a solid and future-proof choice**. However, always evaluate your specific requirements against alternatives to ensure the best cost-performance balance.

Details:

The product is used surplus. All products are guaranteed to be working but may show signs of use. Call to use a shipping service other than the ones listed. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection.

part #: 100c40ej400 prices

• $67.50-$240.00

specifications automationjack:

• brand: Allen Bradley
• mpn: 100-c40ej400

seller automationjack:

• # reviews: 2002 86
• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.6%

shipping automationjack:

• cost: $12.90
• class: Standard
• type: Fixed
• transit: 2-4 Days
• service: Standard

payments automationjack:

• other
• credit card: Discover
• wallet: Apple-pay

offer automationjack:

• quantity: 2
• options: Ship-to-home
• sold: 0
• availability: In Stock
• started: April 20, 2026

returns automationjack:

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

general automationjack:

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

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