ALLEN-BRADLEY 1791D-OV16P Compactblock Devicenet Module I/o

( Brand: Allen-bradley ), ( Manufacturer Part Number: 1791D-OV16P ), ( Part Type: Module ), ( Country Of Manufacture: Malaysia )

Review ALLEN BRADLEY Compactblock I/o Devicenet Output Module Ser

The **Allen-Bradley 1791-DOV16P CompactBlock I/O DeviceNet Module** is a high-performance, modular input/output (I/O) solution designed to deliver robust and scalable automation control within industrial environments. Part of Rockwell Automation s trusted CompactBlock series, this 16-point digital output module integrates seamlessly into DeviceNet networks, offering a compact yet powerful interface for connecting to a wide range of discrete actuators, relays, or other binary devices. Engineered with precision, the 1791-DOV16P provides **16 isolated, normally open (NO) digital outputs**, each capable of sourcing up to **2 amps at 30 volts DC (VDC) or 240 volts AC (VAC)**, making it versatile for applications requiring high-current switching in machinery, conveyors, pumps, or other industrial equipment. Its **DeviceNet communication protocol** ensures reliable, high-speed data exchange with PLCs like the Allen-Bradley ControlLogix or CompactLogix controllers, reducing wiring complexity and enhancing system flexibility. The module s **compact, DIN-rail-mountable design** optimizes space utilization in control panels, while its **industrial-grade construction** featuring rugged enclosures, wide operating temperature ranges (-20 C to 60 C), and resistance to vibration and shock ensures long-term reliability in demanding environments. Additionally, the 1791-DOV16P supports **Allen-Bradley s DeviceNet communication standards**, including automatic addressing and diagnostics, simplifying integration and troubleshooting. Whether deployed in manufacturing, process control, or automation systems, this module delivers a balance of performance, scalability, and ease of use, making it an essential component for engineers seeking efficient and dependable digital output solutions.

The **Allen-Bradley 1791-DOV16P CompactBlock I/O module** is a 16-point digital input/output (DI/DO) module designed for use on a **DeviceNet** network with CompactLogix or CompactGuard controllers. Below is a detailed analysis of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **High Reliability and Industrial-Grade Build**

The 1791-DOV16P is part of Allen-Bradley s ruggedized CompactBlock series, designed for harsh industrial environments. It features robust construction, resistance to vibration, and protection against electrical noise, making it suitable for manufacturing, process control, and automation applications.

2. **DeviceNet Compatibility**

DeviceNet is a widely used fieldbus protocol in industrial automation, offering reliable communication over twisted-pair wiring. The 1791-DOV16P integrates seamlessly with DeviceNet networks, reducing wiring complexity and improving scalability compared to traditional point-to-point connections.

3. **Compact and Modular Design**

The CompactBlock format allows for easy installation in tight spaces, reducing panel footprint requirements. Modules can be hot-swappable in some CompactLogix controllers, minimizing downtime during maintenance.

4. **Flexible I/O Configuration**

The 1791-DOV16P supports both **digital inputs (DI)** and **digital outputs (DO)** in a single module, providing versatility for applications requiring mixed I/O signals. The module can be configured as all inputs, all outputs, or a combination, depending on the application.

5. **High Current Output Capability**

The digital outputs are rated for **2 A per point at 30 VDC**, which is sufficient for driving relays, solenoids, and other low-power actuators without requiring external drivers.

6. **Wide Voltage Range for Inputs**

The digital inputs accept signals from **12 30 VDC**, accommodating a variety of sensors and switches commonly used in industrial environments.

7. **Backward and Forward Compatibility**

The module is compatible with newer CompactLogix controllers (e.g., 1769 series) as well as some older models, ensuring long-term usability even if controller upgrades are planned.

8. **Easy Integration with PLC Programming**

The module integrates seamlessly with **RSLogix 5000** or **Studio 5000** software, allowing for straightforward ladder logic or structured text programming. Its addressable nature simplifies I/O mapping.

9. **Low Latency Communication**

DeviceNet provides deterministic communication, which is critical for applications requiring real-time responses, such as motion control or safety systems.

10. **Cost-Effective for Mid-Sized Applications**

While not the cheapest I/O module available, the 1791-DOV16P offers a balanced combination of performance, reliability, and cost for applications requiring 16 points of DI/DO on a DeviceNet network.

---

### **Cons**

1. **Limited to DeviceNet Protocol**

The module is **DeviceNet-only**, which can be a drawback if the system requires other communication protocols (e.g., Ethernet/IP, ControlNet, or Profibus). This may necessitate additional gateways or converters, adding complexity and cost.

2. **No Analog or High-Speed I/O**

The 1791-DOV16P is strictly digital, meaning it cannot handle analog signals (e.g., 4 20 mA, 0 10 V) or high-speed I/O requirements (e.g., encoder inputs). For applications needing analog signals, additional modules (e.g., 1791-AEBxxx) would be required.

3. **Wiring Complexity for DeviceNet**

DeviceNet requires **shielded twisted-pair wiring**, and improper termination or cable length can lead to communication issues. Unlike Ethernet-based networks, DeviceNet is more sensitive to electrical interference, which may require additional shielding or filtering in noisy environments.

4. **Deprecation of DeviceNet in Newer Systems**

While DeviceNet remains in use, newer Allen-Bradley controllers (e.g., CompactLogix L7 series) emphasize **Ethernet/IP** as the primary communication protocol. Future-proofing may require migrating to Ethernet-based I/O modules, potentially incurring additional costs.

5. **Limited Expansion Capability**

The 1791-DOV16P is a fixed 16-point module. For larger applications, multiple modules or additional I/O racks may be needed, increasing system complexity and cost.

6. **Potential for Higher Long-Term Costs**

If the system evolves to require more advanced features (e.g., Ethernet/IP, wireless connectivity, or integrated safety), replacing DeviceNet modules with newer technologies may become necessary, leading to additional investment.

7. **No Built-In Diagnostics for DeviceNet**

While the module itself is reliable, DeviceNet communication issues (e.g., cable faults, bus conflicts) can be difficult to diagnose without specialized tools. This may require additional troubleshooting time compared to Ethernet-based networks.

8. **Limited Availability of Spare Parts**

As DeviceNet becomes less dominant, finding spare parts or technical support for older modules may become more challenging over time.

---

### **Conclusion**

The **Allen-Bradley 1791-DOV16P** is a **well-suited choice for applications requiring 16 points of digital I/O on a DeviceNet network**, particularly in industries where DeviceNet is already established (e.g., discrete manufacturing, packaging, or process control). Its **rugged design, reliability, and ease of integration** make it a practical solution for mid-sized I/O requirements in existing systems.

However, if the application involves **analog signals, high-speed I/O, or requires future scalability to Ethernet/IP**, alternative modules (e.g., 1769-I/O modules for Ethernet/IP or 1791-AEBxxx for analog) may be more appropriate. Additionally, if the system is being designed for long-term use, considering **Ethernet/IP-based I/O** from the outset could reduce future migration costs.

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### **Recommendation**

- Your system **already uses DeviceNet** and does not require analog or high-speed I/O.

- You need a **reliable, compact digital I/O module** for a discrete control application.

- You are working within a **budget-conscious** framework where DeviceNet s simplicity and cost-effectiveness are advantages.

- Your system **requires analog signals, high-speed I/O, or Ethernet/IP** compatibility.

- You anticipate **future expansion** that may necessitate moving away from DeviceNet.

- The application involves **extreme environmental conditions** where additional protection (e.g., NEMA 4X enclosures) is required though the module itself is robust, its housing may need reinforcement.

For **new projects**, evaluating whether **Ethernet/IP-based I/O modules** (e.g., 1769-I/O series) would be more future-proof is advisable, even if it means a slightly higher upfront cost. However, for **existing DeviceNet systems or applications where DeviceNet is non-negotiable**, the 1791-DOV16P remains a solid and cost-effective option.

Details:

After the return period has ended, you can no longer product. Front panel status indicators for Mod/Net Status and Logic. Country of Manufacture: Malaysia.

Condition: Used. All goods are so AS IS' and WITH ALL FAULTS meaning, without limitation, that. Weight lbs, oz: 0,8. Next Day Second Air Services are available.

Items in Lot: Consignee: B. Brand: Allen-Bradley. Model: 1791D-OV16P.

Need it urgently. We choose the carrier. Shows normal signs of usage. Detachable terminal blocks and DeviceNet connector included.

DeviceNet power: 11-25VDC, 200mA. LOCAL PICK-UP, Prefer to pick it up yourself. Will there be a dock or forklift. Series D, Firmware Rev.

Your phone number and business name.

part #: 1791dov16p prices

• $59.99-$149.99

specifications temperaturcontr:

• brand: Allen-bradley
• mpn: 1791d-ov16p
• part type: Module
• country of manufacture: Malaysia

payments temperaturcontr:

• credit card: Diners-club
• other
• wallet: Apple-pay

returns temperaturcontr:

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

shipping temperaturcontr:

• class: Standard
• service: USPS Ground Advantage
• cost: $7.99
• carrier: USPS
• transit: 4-10 Days
• type: Fixed

general temperaturcontr:

• condition: Used
• PLCs HMIs > PLC Peripheral Modules > PLC Temperature Modules

seller temperaturcontr:

• city: Middlebury, Indiana
• # reviews: 63394
• rating: 99.8%

offer temperaturcontr:

• sold: 0
• started: March 20, 2026
• quantity: 1
• options: Ship-to-home
• availability: In Stock
• best offers: True

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