ALLEN-BRADLEY 1746-0N8 Slc Digital Module Plc SLC500 OW8

( Brand: Allen-bradley ), ( Manufacturer Part Number: 1746-0N8 ), ( Type: Plc Output Module ), ( Analog/digital: Digital ), ( Controller Platform: Slc 500 )

Review ALLEN BRADLEY Slc 500 Digital Output Module 1746 Ow8 Plc Model

The **Allen-Bradley 1746-0N8 SLC 500 Digital Module (1746-OW8)** is a robust and versatile input/output (I/O) expansion module designed for integration into the **SLC 500 Programmable Logic Controller (PLC) series**, offering reliable digital signal processing in industrial automation applications. Part of the **1746-OW series**, this module provides **8 discrete input points**, each capable of handling standard industrial signals while delivering high-performance data acquisition and control within a scalable SLC 500 system. Engineered with Allen-Bradley s signature reliability, the 1746-0N8 features a **compact, DIN-rail-mountable design** that ensures easy installation in tight panel spaces, making it ideal for both new installations and retrofitting existing control systems. The module operates within a **wide voltage range of 24 240 VAC/DC**, accommodating a broad spectrum of input signal types, including resistive, inductive, and capacitive loads, while maintaining precise signal integrity through its **optically isolated inputs**, which enhance noise immunity and protect the PLC from voltage spikes and transients. With a **scan time of just 1 millisecond per point**, the 1746-0N8 ensures rapid response times, making it well-suited for high-speed applications such as conveyor systems, machine sequencing, and discrete manufacturing processes. Its **backplane communication interface** allows seamless integration with the SLC 500 CPU, enabling efficient data transfer and synchronization with other modules in the control network. Additionally, the module supports **Allen-Bradley s proprietary communication protocols**, including **Data Highway Plus (DHP) and DeviceNet**, facilitating seamless interoperability with higher-level systems, HMI interfaces, and enterprise-level software. Built to withstand the demands of industrial environments, the 1746-0N8 is rated for operation in temperatures ranging from **-20 C to 60 C**, with a humidity tolerance of up to **95% non-condensing**, ensuring dependable performance in harsh factory settings. Whether deployed in a small-scale automation project or as part of a larger, distributed control system, this module delivers a balance of **simplicity, durability, and performance**, making it a trusted choice for engineers and technicians seeking a dependable solution for digital signal acquisition in PLC-based applications.

**Pros and Cons of buying a Allen-Bradley 1746-0N8 SLC 500 Digital Module (1746-OW8 PLC)**

### **Pros**

1. **Reliability and Proven Performance**

The SLC 500 series, including the 1746-0N8 module, is a well-established PLC platform from Rockwell Automation, known for its durability and consistent operation in industrial environments. It has been widely used for decades, which means a large support network and extensive documentation exist.

2. **Compatibility with Legacy Systems**

The SLC 500 series is designed to integrate seamlessly with older industrial control systems, making it a practical choice for facilities that rely on existing infrastructure. It supports a variety of communication protocols, including DH-485, DH , and RS-232, which enhances its versatility.

3. **Cost-Effective for Basic Automation**

Compared to newer PLC platforms, the SLC 500 series is relatively affordable, especially for applications requiring basic digital I/O control. The 1746-0N8 module itself is a cost-effective solution for adding digital inputs or outputs to an existing SLC 500 system.

4. **Easy to Program and Maintain**

The SLC 500 uses ladder logic (ladder diagram), a programming language that is intuitive for engineers and technicians familiar with relay-based control systems. This makes programming and troubleshooting more accessible, particularly for those without advanced programming experience.

5. **Wide Availability of Parts and Support**

Since the SLC 500 series is no longer in active production, spare parts, modules, and documentation remain widely available through third-party suppliers, eBay, or Rockwell s authorized distributors. This ensures that maintenance and upgrades are feasible even after the original manufacturer s support has diminished.

6. **Scalability**

The SLC 500 architecture allows for easy expansion by adding additional I/O modules, such as the 1746-OW8 (which appears to be a typo or mislabel likely referring to a digital I/O module like the 1746-OB8 or similar). This modularity makes it suitable for projects that may require growth over time.

7. **Industrial-Grade Build**

The SLC 500 series is designed to operate in harsh industrial environments, with robust enclosures and resistance to temperature fluctuations, vibration, and electrical noise. This ensures long-term reliability in demanding applications.

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### **Cons**

1. **Outdated Technology**

The SLC 500 series is an older platform, lacking the advanced features found in modern PLCs, such as built-in Ethernet, high-speed communication protocols (e.g., EtherNet/IP), or integrated safety functions. This can limit its applicability in newer or more complex automation systems.

2. **Limited Communication Options**

While the SLC 500 supports basic communication protocols, it lacks modern connectivity options such as Ethernet, Wi-Fi, or support for cloud-based monitoring. This can be a significant drawback for applications requiring real-time data exchange with SCADA systems, HMI interfaces, or remote diagnostics.

3. **Deprecated Software Support**

Rockwell Automation has shifted its focus to newer platforms like the ControlLogix, CompactLogix, or Studio 5000 series. Software tools for the SLC 500, such as RSLogix 500, may no longer receive updates or security patches, posing potential risks for long-term use.

4. **Higher Maintenance Over Time**

As components age, finding replacement parts or technicians with expertise in the SLC 500 can become challenging. While parts are still available, the lack of active support from Rockwell may lead to delays or higher costs for maintenance and repairs.

5. **Performance Limitations**

The SLC 500 series has lower processing speeds and memory capacity compared to modern PLCs. This can be a bottleneck for applications requiring high-speed control, complex algorithms, or large-scale data processing.

6. **Compatibility Issues with Modern Systems**

Integrating the SLC 500 with newer devices, such as servo drives, variable frequency drives (VFDs), or advanced sensors, may require additional gateways or interfaces. This can add complexity and cost to the system design.

7. **Environmental and Compliance Challenges**

Older PLCs may not meet the latest environmental or safety standards (e.g., IEC 61131-3 compliance, cybersecurity requirements). This could pose risks in applications where compliance is critical, such as in food processing, pharmaceuticals, or critical infrastructure.

---

### **Conclusion**

The Allen-Bradley 1746-0N8 SLC 500 digital module (or similar I/O module) is a practical choice for applications where cost, reliability, and compatibility with legacy systems are prioritized. It excels in basic automation tasks, small-scale control systems, or as a replacement for older PLCs where modern features are unnecessary. However, for new projects requiring advanced communication, high-speed processing, or integration with contemporary industrial networks, investing in a newer PLC platform would be more advantageous.

The decision to purchase this module should be based on whether the benefits of its reliability and cost-effectiveness outweigh the limitations of its outdated technology. If the system is part of a larger legacy infrastructure with no immediate plans for expansion or modernization, the SLC 500 remains a viable and cost-efficient solution.

---

### **Recommendation**

- You are maintaining or upgrading an existing SLC 500 system.

- Your application requires only basic digital I/O control without advanced communication needs.

- Budget constraints make newer PLCs impractical.

- You have access to technical support or experienced personnel familiar with the SLC 500 platform.

- You are starting a new project that requires modern communication protocols (e.g., Ethernet/IP, Modbus TCP).

- Your application demands high-speed processing, large-scale data handling, or integration with cloud-based systems.

- Long-term maintenance and support are a concern due to the lack of active manufacturer backing.

- You plan to scale the system significantly in the future, as newer PLCs offer better scalability and flexibility.

For new installations or applications requiring cutting-edge features, consider upgrading to a modern PLC platform such as the Allen-Bradley CompactLogix, ControlLogix, or even a more affordable alternative like the Siemens S7-1200 or Beckhoff TwinCAT. However, if the SLC 500 aligns with your current needs and constraints, it remains a sound and cost-effective option.

Details:

Specifically designed for the SLC 500 controller platform, this digital output module allows efficient communication and control of various devices within a PLC system. With its reliable brand reputation and specific model compatibility, this module offers a seamless integration solution for businesses industrial automation applications. Removed from fully functional unit The Allen-Bradley SLC 500 Digital Output Module 1746-OW8 is a specialized PLC peripheral module designed for industrial automation and motion control systems.

part #: 17460n8 prices

• $60.00-$125.00

specifications sensoindustria:

• brand: Allen-bradley
• mpn: 1746-0n8
• type: Plc Output Module
• analog/digital: Digital
• controller platform: Slc 500

general sensoindustria:

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

offer sensoindustria:

• options: Ship-to-home
• best offers: True
• sold: 0
• availability: In Stock
• quantity: 1
• started: February 3, 2026

returns sensoindustria:

• policy: No Returns

payments sensoindustria:

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• credit card: Discover
• other

shipping sensoindustria:

• type: Calculated
• carrier: USPS
• class: Standard
• transit: 3-9 Days
• service: USPS Ground Advantage
• cost: $6.68

seller sensoindustria:

• rating: 100.0%
• city: Billings, Montana
• # reviews: 207

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