ALLEN-BRADLEY Z-243 Controllogix Point Module 1756-OB16E
( Brand: Allen-bradley ), ( Manufacturer Part Number: Z-243 ), ( Part Type: Module ), ( Controller Platform: Controllogix )
Review ALLEN BRADLEY Series Controllogix Point Module
The **Allen-Bradley 1756-OB16E** is a high-performance **16-point output module** designed for integration into the **Rockwell Automation Controllogix 5000** control platform, offering robust and scalable digital control solutions for industrial automation applications. Part of the **CompactLogix** and **ControlLogix** series, this module provides a reliable means of driving low-power DC or solid-state relay (SSR) loads, making it ideal for machinery control, process automation, and factory automation environments where precise and dependable output signaling is critical. With a **16-channel configuration**, the 1756-OB16E delivers flexibility in addressing a wide range of control requirements, from simple motor starters and solenoid actuation to complex sequencing and safety interlocking systems. Constructed with **Allen-Bradley s industrial-grade engineering**, this module features a **compact, DIN-rail mountable design** that ensures easy installation in tight panel spaces while maintaining optimal airflow for thermal management. The module supports **24V DC or 120V AC** output configurations, depending on the specific application needs, and is compatible with **ControlLogix processors** such as the 1756-L6x, 1756-L7x, and 1756-L8x series, ensuring seamless integration into existing or new control architectures. Its **high-current output capability** (up to **2A per point**) allows for the direct control of a variety of actuators, relays, and indicators without the need for additional intermediate devices, reducing system complexity and improving overall efficiency. The 1756-OB16E also incorporates **Allen-Bradley s advanced diagnostics and monitoring features**, enabling real-time fault detection, status reporting, and predictive maintenance capabilities through the **ControlLogix system s built-in logging and alarming functions**. This enhances operational reliability and minimizes downtime by providing immediate feedback on module health and performance. Built to withstand the rigors of industrial environments, the module is **IP65-rated**, offering protection against dust, dirt, and moisture, while its **wide operating temperature range (-20 C to 60 C)** ensures consistent performance across diverse climates. Whether deployed in a manufacturing plant, a process control facility, or a demanding automation system, the **1756-OB16E** delivers a dependable, high-performance solution that aligns with the demands of modern industrial automation, combining ease of use with uncompromising durability.
The **Allen-Bradley 1756-OB16E** is a 16-point discrete output module designed for use with the **ControlLogix** platform. Below is a detailed analysis of its pros and cons, followed by a conclusion and recommendation.
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### **Pros of the 1756-OB16E**
1. **Compatibility with ControlLogix Platform**
The module is fully integrated with the **ControlLogix** series (e.g., 5562, 5563, 5580), ensuring seamless communication via the **EtherNet/IP** network. This makes it ideal for modern automation systems requiring high-speed data exchange.
2. **High Reliability and Industrial-Grade Build**
Allen-Bradley (now part of Rockwell Automation) is known for robust, long-lasting industrial components. The 1756-OB16E is designed for harsh environments, with features like:
- **Wide operating temperature range** (typically -20 C to 60 C).
- **High vibration and shock resistance**, suitable for factory floors.
- **Long lifespan**, reducing maintenance downtime.
3. **Scalability and Flexibility**
The module supports **16 discrete outputs**, which can be configured as:- **Relay outputs** (24V AC/DC, 0.5A max).
- **Transistor outputs** (24V DC, 0.5A max).
This versatility allows it to interface with a variety of actuators, solenoids, and indicators.
4. **EtherNet/IP Communication**
The module communicates over **EtherNet/IP**, a high-performance protocol that supports:- **Fast data transfer** (critical for real-time control applications).
- **Integration with PLCs, HMIs, and SCADA systems** without additional hardware.
- **Scalability** for larger systems with multiple modules.
5. **Easy Integration with Rockwell Software**
Works seamlessly with **Studio 5000**, **RSLogix 5000**, and **FactoryTalk View** for programming, monitoring, and troubleshooting. This reduces development time and simplifies system maintenance.
6. **Standardized and Well-Documented**
As a legacy but widely used module, it benefits from:- **Extensive documentation** (manuals, datasheets, and community support).
- **Proven performance** in thousands of industrial applications.
- **Easy availability** of spare parts and replacements.
7. **Cost-Effective for Legacy Systems**
While newer modules may offer additional features, the 1756-OB16E remains a **cost-effective solution** for:- Upgrading older ControlLogix systems.
- Replacing failed modules in existing setups.
- Applications where advanced features (e.g., analog outputs, higher current ratings) are unnecessary.
---
### **Cons of the 1756-OB16E**
1. **Limited Output Current**
The module provides **only 0.5A per output**, which may be insufficient for:- High-power actuators (e.g., large motors, heavy-duty solenoids).
- Applications requiring **higher current ratings** (e.g., 1A or 2A outputs).
In such cases, a **1756-OB16N** (relay module with higher contact ratings) or a **1756-OB16C** (transistor module with higher current) may be needed.
2. **No Built-In Diagnostics for Outputs**
Unlike some newer modules, the 1756-OB16E lacks **advanced diagnostics** (e.g., real-time monitoring of output failures, short circuits, or overloads). Troubleshooting may require additional hardware (e.g., **Allen-Bradley 1756-DN16E** for diagnostics).
3. **Outdated Compared to Modern Alternatives**
While still functional, newer **ControlLogix-compatible modules** (e.g., **1756-OB16N**, **1756-OB16C**, or **1756-OB16E **) offer:- **Higher current ratings**.
- **Enhanced communication protocols** (e.g., improved EtherNet/IP performance).
- **Better integration with modern HMI/SCADA systems**.
If budget allows, upgrading to a newer model may provide long-term benefits.
4. **Physical Size and Space Constraints**
The module occupies space in a **ControlLogix chassis**, which may be a limitation in:- **Compact system designs**.
- **Retrofits where space is tight**.
Alternative solutions (e.g., **remote I/O** or **distributed I/O**) could be more space-efficient.
5. **Deprecated Status**
While not yet obsolete, the 1756-OB16E is **not actively developed** by Rockwell. This means:- **Limited future firmware updates** (though unlikely to affect functionality).
- **Potential challenges in sourcing** if Rockwell discontinues production (though spares are widely available).
- **No support for the latest Rockwell software features** (e.g., advanced security protocols).
6. **No Built-In Isolation for AC Outputs**
The **relay outputs (24V AC)** are not isolated, which may pose a risk in:- **High-voltage applications** (though 24V is generally safe, grounding considerations apply).
- **Systems requiring galvanic isolation** for safety or noise reduction.
7. **Limited Expansion Options**
The module does not support **additional features** like:- **Analog outputs** (for process control).
- **High-speed counter inputs** (for motion control).
- **Modbus or other non-EtherNet/IP protocols**.
If these are needed, a different module or additional hardware would be required.
---
### **Conclusion**
The **Allen-Bradley 1756-OB16E** is a **reliable, well-established discrete output module** ideal for **ControlLogix-based applications** where:- **16 discrete outputs** (relay or transistor) are sufficient.
- **EtherNet/IP communication** is the primary requirement.
- **Cost-effectiveness and legacy compatibility** are priorities.
- **High reliability in industrial environments** is critical.
However, if the application requires:- **Higher current outputs** (>0.5A).
- **Advanced diagnostics or isolation**.
- **Modern features** (e.g., better security, higher-speed communication).
- **Scalability beyond discrete outputs** (e.g., analog or high-speed I/O),
then a **newer module (e.g., 1756-OB16N, 1756-OB16C, or 1756-OB16E )** or an **alternative solution** (e.g., remote I/O) may be more appropriate.
---
### **Recommendation**
**Buy the 1756-OB16E if:**You are maintaining or upgrading an **existing ControlLogix system** and need a **proven, cost-effective discrete output module**.
Your application **does not require high current outputs** (>0.5A).
You prioritize **reliability and long-term availability** over cutting-edge features.
You are working with **24V AC/DC loads** that fit within the module s specifications.
**Consider an alternative if:**You need **higher current outputs** (e.g., for motors or heavy loads) **1756-OB16N (relay) or 1756-OB16C (transistor)**.
You require **analog outputs, high-speed counters, or additional diagnostics** **Evaluate newer modules or remote I/O**.
Your system is **new or expanding**, and you want **future-proofing** **Invest in a more modern module (e.g., 1756-OB16E )**.
Space is a **critical constraint** **Explore remote I/O or distributed systems**.
**Final Verdict:**The **1756-OB16E remains a solid choice for many ControlLogix applications**, especially in **legacy or cost-sensitive environments**. However, for **new installations or high-demand applications**, weighing the trade-offs against newer alternatives is advisable. Always verify compatibility with your specific **PLC model, software version, and load requirements** before purchasing.
Details:
Pulled from working machine. Manufactured by Allen-Bradley, a trusted brand in automation technology, this module is specifically designed for the ControlLogix platform. The Allen-Bradley 1756-OB16E Series A ControlLogix 16 Point Module is a reliable industrial automation device designed for use with PCs and Hims. Ideal for businesses and industries requiring precise coordinated automation, this module offers a high-quality solution enhancing productivity system performance.
It provides 16 points of output for efficient control and management industrial processes or equipment.
part #: z243 prices
- $134.99-$212.50
specifications sensoindustria:
- brand: Allen-bradley
- mpn: Z-243
- part type: Module
- controller platform: Controllogix
offer sensoindustria:
- availability: In Stock
- options: Ship-to-home
- sold: 0
- best offers: True
- started: May 30, 2026
- quantity: 1
returns sensoindustria:
- paid by: Seller
- policy: Returns Accepted
- time: 30 Days
- method: Money back
payments sensoindustria:
- credit card: Visa
- other
- wallet: Google-pay
general sensoindustria:
- PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules
- condition: Used
shipping sensoindustria:
- class: Standard
- transit: 4-7 Days
- service: USPS Ground Advantage
- carrier: USPS
- type: Fixed
- cost: $0.00
seller sensoindustria:
- city: Erie, Pennsylvania
- rating: 100.0%
- # reviews: 2695
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