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  3. ALLEN BRADLEY 1746-IB6

ALLEN-BRADLEY 1746-IB6 Slc Module 500

1746-ib6 Allen-bradley Ser C Slc 500 Input Module

( Brand: Allen-bradley ), ( Manufacturer Part Number: 1746-IB6 ), ( Type: Plc Input Module ), ( Controller Platform: Slc 500 ), ( Country Of Origin: United States )

Review ALLEN BRADLEY Ser Slc 500 Input Module

The **Allen-Bradley 1746-IB6** is a high-performance, modular input module designed specifically for the **SLC 500** programmable logic controller (PLC) series, offering reliable and versatile digital input functionality in industrial automation applications. Part of the **1746 series**, this compact yet robust module features **six isolated, 24-volt DC (VDC) sinking inputs**, making it ideal for interfacing with a wide range of sensors, switches, and discrete devices in control systems. Each input channel is individually isolated, ensuring protection against voltage spikes, noise, and ground loops, which enhances system stability and extends equipment lifespan. The module operates within a broad voltage range of **18 32 VDC**, accommodating variations in power supply conditions while maintaining consistent performance, and its **sinking input configuration** allows it to directly interface with common NPN-based sensors, pushbuttons, and limit switches without requiring additional optocouplers or isolation components. With a **scan time of just 1.2 milliseconds per module**, the 1746-IB6 delivers rapid response times, enabling real-time monitoring and control in high-speed manufacturing, process automation, and material handling applications. Its **compact, DIN-rail mountable design** (measuring approximately **1.5 inches wide**) allows for efficient space utilization in control panels, while its **backplane-mounted or remote I/O configuration** provides flexibility in system architecture, whether deployed in a centralized PLC enclosure or distributed across a network. The module also includes **LED indicators** for each input channel, providing immediate visual feedback on the status of connected devices, which simplifies troubleshooting and system diagnostics. Built to withstand the rigors of industrial environments, the 1746-IB6 is rated for operation in temperatures ranging from **-20 C to 60 C ( 4 F to 140 F)**, with a humidity tolerance of **5 95% non-condensing**, ensuring reliable performance in harsh conditions such as factories, oil and gas facilities, and automotive assembly lines. Whether used in standalone SLC 500 systems or integrated into larger automation networks, this module exemplifies Allen-Bradley s commitment to durability, precision, and ease of integration, making it a cornerstone component for engineers and technicians seeking dependable digital input solutions.

### **Pros and Cons of Buying an Allen-Bradley 1746-IB6 SLC 500 Module**

The **Allen-Bradley 1746-IB6** is a 6-point discrete input module designed for use with the **SLC 500** programmable logic controller (PLC) series. Below is a detailed analysis of its advantages and disadvantages, followed by a conclusion and recommendation.

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### **Pros**

1. **Compatibility with Legacy Systems**

The 1746-IB6 is part of the **SLC 500** line, which was widely used in industrial automation from the 1980s to early 2000s. Many older control systems still rely on this hardware, making it a reliable choice for maintenance or expansion of existing setups.

2. **Reliable and Proven Technology**

The SLC 500 series is known for its robustness in harsh industrial environments. The 1746-IB6 module has been tested and validated for long-term operation, reducing the risk of frequent failures.

3. **Easy Integration with Other SLC 500 Modules**

Since it is designed specifically for the SLC 500 platform, wiring and programming are straightforward. It fits seamlessly into existing SLC 500 control systems without requiring additional adapters or complex configurations.

4. **Cost-Effective for Maintenance and Repairs**

For facilities still using SLC 500 controllers, purchasing replacement modules like the 1746-IB6 is often cheaper than upgrading to newer PLC systems. This makes it a practical solution for cost-conscious operations.

5. **Wide Availability of Spare Parts**

Due to its long production history, the 1746-IB6 and related SLC 500 components are still available through authorized distributors, resellers, and even eBay or industrial surplus markets.

6. **Simple Input Configuration**

The module provides **6 discrete inputs** (typically for pushbuttons, limit switches, or sensors) with **24V DC or 120V AC** options, making it versatile for basic control applications.

7. **Backward Compatibility with Software**

Programming tools like **RSLogix 500** (or older versions) support the SLC 500, ensuring that existing ladder logic programs can continue to function without major modifications.

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### **Cons**

1. **Outdated Technology**

The SLC 500 platform is **no longer manufactured** by Rockwell Automation (now part of Allen-Bradley). This means no official technical support, firmware updates, or new feature releases, which could be a concern for long-term reliability.

2. **Limited Scalability**

The SLC 500 architecture is **not expandable** to newer Allen-Bradley platforms (e.g., ControlLogix, CompactLogix, or Studio 5000). If future upgrades are needed, migrating to a modern PLC may require significant reprogramming and hardware changes.

3. **Higher Long-Term Maintenance Costs**

While the module itself may be affordable, the lack of official support means troubleshooting issues may require third-party expertise or reliance on outdated documentation. This could increase maintenance time and costs over time.

4. **Potential for Obsolescence Risks**

Some suppliers may discontinue stock of SLC 500 modules, leading to **supply chain disruptions** if spare parts are needed urgently. This is particularly risky for critical applications where downtime is unacceptable.

5. **Limited Diagnostic Capabilities**

Compared to modern PLCs, the SLC 500 lacks advanced diagnostics, remote monitoring, and predictive maintenance features. This makes it harder to detect issues before they cause failures.

6. **Compatibility Issues with Newer Software**

While **RSLogix 500** still supports SLC 500 programming, newer versions of **Studio 5000** or **FactoryTalk** may not fully integrate with legacy modules, requiring additional workarounds.

7. **Environmental and Safety Compliance Risks**

Older PLC hardware may not meet **current safety standards** (e.g., IEC 61508, IEC 62061) or **environmental regulations** (e.g., RoHS compliance in newer versions). This could be a concern for new installations or regulatory audits.

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### **Conclusion**

The **Allen-Bradley 1746-IB6 SLC 500 module** is a **practical and cost-effective choice** for maintaining or expanding existing **SLC 500-based control systems**. Its reliability, ease of integration, and widespread availability make it ideal for facilities that **do not plan to upgrade** their PLC architecture in the near future.

However, if the system is **critical to operations** or if there is a possibility of future expansion, the risks of **obsolecence, limited support, and compatibility issues** with modern software and safety standards should be carefully considered. Over time, the **lack of official updates and potential supply chain disruptions** could lead to higher maintenance costs and operational risks.

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### **Recommendation**

- **Buy the 1746-IB6 if:**

- You are **maintaining an existing SLC 500 system** with no immediate plans to upgrade.

- You need **quick, low-cost replacement** for a failing input module.

- Your application is **non-critical** and does not require advanced diagnostics or future scalability.

- **Avoid or Plan for Replacement if:**

- Your system is **critical to production** and downtime must be minimized consider a **modern PLC (e.g., CompactLogix or Micro800)** with better support.

- You anticipate **future upgrades or expansions** migrating to a newer platform (e.g., **Studio 5000 or FactoryTalk**) will be necessary.

- You require **advanced safety features, remote monitoring, or compliance with current standards** legacy modules may not meet these needs.

- **Alternative Considerations:**

- If possible, **source a used or refurbished module** from a reputable supplier to reduce costs further.

- If budget allows, **evaluate a drop-in replacement** from a third-party manufacturer (e.g., **AutomationDirect s SLC-compatible modules**) that may offer better long-term support.

- If the system is **vital to operations**, **budget for a gradual migration** to a modern PLC to avoid future obsolescence risks.

Ultimately, the decision depends on **budget constraints, system criticality, and long-term operational strategy**. For most **legacy SLC 500 setups**, the 1746-IB6 remains a **sound short-term solution**, but a **phased upgrade plan** should be considered for long-term reliability.

Details:

Specifically designed for the SLC 500 controller platform, this module is manufactured in USA. The 1746-IB6 Ser C Allen Bradley SLC 500 Input Module is a PLC Programmable Logic Controller input module made by the well-known brand Allen-Bradley. Ideal for industrial automation and motion control systems, this input module allows efficient reliable data collection processing within PLC systems.

part #: 1746ib6 prices

  • $25.00-$48.00

specifications sensoindustria:

  • brand: Allen-bradley
  • mpn: 1746-ib6
  • type: Plc Input Module
  • controller platform: Slc 500
  • country of origin: United States

offer sensoindustria:

  • sold: 0
  • quantity: 1
  • options: Ship-to-home
  • availability: In Stock
  • started: May 13, 2026

seller sensoindustria:

  • city: Bethlehem, Pennsylvania
  • # reviews: 374
  • rating: 100.0%

general sensoindustria:

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

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  • service: USPS Ground Advantage
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  • cost: $0.00
type: plc input module, controller platform: slc 500, country of origin: united states,
category: business & industrial > plcs hmis > plc peripheral modules > plc input output modules, sku: 22714523034368721,
Allen-bradley 1746-IB6 Is Similar To:
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2 offers $25.00–$48.00 USD
  • Used. Offer #1 priced at $25.00 + $0.00 shipping estimate = $25.00* total. Ideal for industrial automation and motion control systems, this input module allows for efficient and reliable data collection and processing within PLC systems. The Ser C Allen Bradley SLC 500 Input Module is a PLC (Programmable Logic Controller) input module made by the well-known brand Allen-Bradley.FREE SHIPPING
  • Used. Offer #2 priced at $48.00 + $0.00 shipping estimate = $48.00* total. SEE PHOTOS. 10-30 VDC INPUT MODULE FOR SLC 5 PLC.FREE SHIPPING

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