ALLEN BRADLEY 1794-OWS Module Unmp Ser.a

( Brand: Allen Bradley ), ( Manufacturer Part Number: 1794-OWS ), ( Part Type: Module )

Review ALLEN BRADLEY Ser.a Module Unmp

The **Allen-Bradley 1794-OWS Series A module** is a high-performance, modular output module designed for integration into Rockwell Automation s CompactLogix, ControlLogix, and other PLC systems, offering robust and scalable control solutions for industrial automation applications. Part of the **Series A** line, this **1794-OWS** module provides **16 isolated, 24V DC sinking outputs**, making it ideal for driving a wide range of low-power devices such as relays, solenoids, indicators, and other control actuators in manufacturing, process control, and machine automation environments. With a **compact, DIN-rail mountable design**, it ensures efficient space utilization in control panels while maintaining high reliability and ease of installation. The module features **industry-standard Allen-Bradley connectivity**, including a **1794 backplane interface** for seamless integration with other CompactLogix or ControlLogix controllers, ensuring compatibility with Rockwell s comprehensive programming and diagnostics ecosystem.

Engineered for **high durability**, the **1794-OWS** is built to withstand harsh industrial conditions, with an **operating temperature range of -25 C to 70 C** and **IP65-rated enclosure protection**, making it suitable for environments exposed to dust, moisture, and vibration. Each of its **16 outputs** is individually isolated, providing **24V DC sinking capability** with a maximum sink current of **0.5A per point** (1A per point when configured for **1794-OWS with 1A current rating**), allowing for flexible control of both resistive and inductive loads. The module supports **fault detection and diagnostics**, including **open-circuit, short-circuit, and overload protection**, which helps prevent equipment damage and reduces downtime. Additionally, it features **configurable output states** via the **RSLogix or Studio 5000 software**, enabling users to set default states, pulse widths, and other parameters to optimize system performance.

The **1794-OWS Series A** module is designed with **modular flexibility** in mind, allowing for easy expansion of control systems by adding additional I/O modules as needed. Its **backplane communication** ensures fast data transfer and minimal latency, making it well-suited for applications requiring precise timing and synchronization. The module also supports **Rockwell s structured programming languages**, including **Ladder Logic (LD), Structured Text (ST), and Function Block Diagrams (FBD)**, enabling engineers to implement complex control logic with ease. Whether used in **discrete manufacturing, packaging systems, material handling, or process automation**, the **1794-OWS** delivers **reliable, high-performance output control** while adhering to strict industrial standards for safety and efficiency. Its **long-term availability** and **proven track record** make it a trusted choice for engineers seeking a dependable solution for their automation needs.

### **Pros and Cons of Buying an Allen-Bradley 1794-OWS SER.A Module (Unused/Unmounted)**

#### **Pros**

1. **Reliability and Brand Reputation** Allen-Bradley (now part of Rockwell Automation) is a well-established manufacturer known for durable, high-quality industrial automation components. The 1794-OWS SER.A is a proven module used in PLC systems for digital I/O, ensuring long-term performance in harsh environments.

2. **Compatibility with Rockwell Automation Systems** This module is designed to integrate seamlessly with Rockwell s PLCs (e.g., ControlLogix, CompactLogix, or SLC 500 series), reducing compatibility issues and ensuring smooth operation in existing setups.

3. **Digital Output Functionality** The 1794-OWS SER.A provides 8 isolated digital outputs, which are useful for controlling relays, solenoids, or other high-side loads. The isolation prevents ground loops and improves safety in industrial applications.

4. **Modular and Expandable Design** As part of the 1794 series, this module fits into Rockwell s backplane or DIN rail mounting systems, allowing for easy expansion of I/O configurations without major system redesigns.

5. **Industrial-Grade Build** The module is built to withstand temperature extremes, vibration, and electrical noise, making it suitable for manufacturing, process control, and other demanding environments.

6. **Secondhand Availability** Since it is an older model, you can often find it at a lower cost than newer equivalents, especially if purchasing from reputable surplus suppliers or eBay sellers with return policies.

7. **Proven Performance in Legacy Systems** If your existing system relies on this module, replacing a faulty unit with an identical one ensures backward compatibility without requiring software or firmware updates.

---

#### **Cons**

1. **Outdated Technology** The 1794-OWS SER.A is from an older generation (discontinued in favor of newer models like the 1794-OWS SER.B or 1794-OWS SER.C). This means:

- Limited availability of spare parts or direct support from Rockwell.

- Potential obsolescence risks if Rockwell stops manufacturing compatible backplanes or power supplies.

- No access to newer firmware or security patches (though this module is not networked by default).

2. **Higher Long-Term Costs** While the upfront cost may be low, the lack of support or future-proofing could lead to higher maintenance costs if issues arise. Replacement parts may become harder to source over time.

3. **No Built-in Diagnostics or Advanced Features** Newer modules often include self-diagnostics, remote monitoring, or integration with cloud platforms. This module lacks such features, requiring manual troubleshooting.

4. **Potential Compatibility Issues with Newer Software** If your PLC firmware or programming environment (e.g., Studio 5000) is updated, there may be subtle incompatibilities, though the module itself should function mechanically.

5. **Environmental and Safety Considerations** While robust, older modules may not meet modern safety standards (e.g., IEC 61508, SIL ratings) if used in critical applications. Always verify compliance with your specific safety requirements.

6. **No Warranty or Return Options** Purchasing from a third-party seller (especially online) often means no warranty. If the module fails shortly after purchase, you may be out of luck unless you buy from a supplier with a return policy.

7. **Limited Customization** Unlike newer modules, this one does not offer configurable input/output types or programmable parameters, restricting flexibility in certain applications.

---

### **Conclusion**

- You need a **proven, industrial-grade digital output module** for a legacy Rockwell system.

- **Budget constraints** make newer modules impractical.

- The module is **already confirmed compatible** with your existing setup.

- You are **prepared to handle potential long-term sourcing challenges**.

However, if you are **starting a new project** or require **future scalability, advanced diagnostics, or warranty support**, investing in a **newer equivalent** (e.g., 1794-OWS SER.B/C or a modular I/O system like the 1794-AENT) may be more prudent despite the higher upfront cost.

---

### **Recommendation**

- You have an **existing system** that requires this exact module.

- You are **certain of compatibility** with your PLC and power supply.

- You **prioritize cost savings** over long-term support.

- You **source from a reputable supplier** (e.g., AutomationDirect, eBay with return options, or a trusted surplus dealer).

- You are **starting a new project** and can afford a more modern solution.

- You need **warranty coverage, diagnostics, or future-proofing**.

- Your application requires **higher safety certifications** or **expanded I/O flexibility**.

- You anticipate **long-term use** where obsolescence could become an issue.

**Final Note:** Always test the module thoroughly upon receipt (e.g., verify outputs, check for physical damage, and confirm compatibility with your system) before integrating it into production. If possible, consult with a Rockwell Automation specialist or a trusted automation engineer to assess whether this module aligns with your long-term goals.

Details:

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part #: 1794 prices

• $152.00-$295.00

specifications sensoindustria:

• brand: Allen Bradley
• mpn: 1794-ows
• part type: Module

shipping sensoindustria:

• class: Standard
• carrier: USPS
• service: USPS First Class
• type: Fixed
• cost: $0.00
• transit: 4-10 Days

returns sensoindustria:

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

seller sensoindustria:

• rating: 99.8%
• city: Knoxville, Tennessee
• # reviews: 22571

payments sensoindustria:

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offer sensoindustria:

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

general sensoindustria:

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

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