ALLEN BRADLEY 1746-IM8 Plc Modules

( Brand: Allen Bradley ), ( Manufacturer Part Number: 1746-IM8 ), ( Part Type: Module )

Review ALLEN BRADLEY 1746im8 Used

The **Allen-Bradley 1746-IM8** is a high-performance, modular input/output (I/O) module designed for integration into the **Rockwell Automation CompactLogix 5370, 5380, and 5480** series of programmable logic controllers (PLCs). This **8-channel, isolated digital input module** is engineered to provide reliable and robust signal processing in industrial automation applications where precision and durability are critical. Built with **Allen-Bradley s industry-leading quality standards**, the 1746-IM8 features **8 discrete, isolated inputs** capable of handling a wide range of voltage and current signals, making it versatile for applications such as machine control, process automation, and factory automation. Each input channel is **optically isolated**, ensuring protection against voltage spikes, noise, and ground loops, which enhances system stability and extends equipment lifespan. The module operates within a **wide input voltage range of 12 30 VDC or 24 60 VAC**, accommodating various sensor and switch configurations, including dry contact, PNP, and NPN signals, while maintaining consistent performance across different environmental conditions. Its **compact, DIN-rail mountable design** allows for efficient space utilization in control panels, and the **backlit LED indicators** provide real-time status monitoring of each input channel, simplifying troubleshooting and maintenance. The 1746-IM8 is fully compatible with **Rockwell Automation s Studio 5000 software**, enabling seamless integration with other PLC modules, HMIs, and supervisory control systems through structured wiring and standard communication protocols. Whether deployed in harsh manufacturing environments, energy management systems, or automated material handling applications, this module delivers **high-speed response times** and **exceptional reliability**, making it an essential component for engineers and technicians seeking a dependable solution for digital input requirements in modern industrial automation.

### **Pros and Cons of Buying an Allen-Bradley 1746-IM8 PLC (CompactLogix 5370)**

#### **Pros**

1. **Reliability and Durability**

The 1746-IM8 is part of Allen-Bradley s **CompactLogix** series, known for robust industrial-grade construction. It is designed for harsh environments, with features like **wide temperature tolerance (-40 C to 70 C)**, **vibration resistance**, and **long-term stability**. This makes it suitable for continuous operation in manufacturing, process control, and automation applications.

2. **High Performance and Processing Power**

The **IM8 model** includes an **8 MB user memory** (expandable via optional modules) and supports **high-speed I/O**, making it capable of handling complex control tasks, motion control, and real-time data processing. It also supports **EtherNet/IP**, **CIP (Common Industrial Protocol)**, and **DeviceNet**, ensuring seamless integration with modern industrial networks.

3. **Compatibility with Rockwell Automation Ecosystem**

As part of the **CompactLogix 5370 family**, it integrates natively with **Studio 5000**, **RSLogix 5000**, and other Rockwell software platforms. This simplifies programming, debugging, and maintenance, especially for users already invested in Rockwell s ecosystem.

4. **Scalability and Modularity**

The **IM8** can be expanded with additional **I/O modules** (digital, analog, high-speed counters, etc.) via the **1769 series** or **1771 series** expansion slots. This allows users to scale the system as their application requirements grow without replacing the entire PLC.

5. **Energy Efficiency**

Compared to older PLC generations, the **CompactLogix 5370** series consumes less power, reducing operational costs and heat generation in control panels.

6. **Long-Term Availability and Support**

Rockwell Automation (now part of **Rockwell Automation, a subsidiary of Emerson**) has a strong **support and spare parts program**, ensuring that replacement parts and firmware updates will likely remain available for years. This is crucial for **legacy system maintenance** in industries where equipment must run for decades.

7. **Advanced Communication Protocols**

Supports **EtherNet/IP (CIP)**, **Modbus TCP**, **PROFINET**, and **DeviceNet**, allowing integration with **SCADA systems, HMIs, and other industrial devices**. This flexibility is valuable for modern automation architectures.

8. **Built-in Safety and Redundancy Options**

The **IM8** supports **safety-rated I/O** (via **1769-SA modules**) and can be part of a **redundant control system** for critical applications, improving reliability in high-stakes environments.

9. **Cost-Effective for Mid-Range Applications**

While not as expensive as high-end **ControlLogix** or **PowerFlex** systems, the **1746-IM8** offers **better performance than older CompactLogix models** (e.g., 5370-B) at a reasonable price, making it a **cost-effective upgrade** for many industrial applications.

10. **Proven Track Record**

The **CompactLogix** series has been widely adopted across **automotive, food & beverage, pharmaceutical, and manufacturing industries**, with a **strong reputation for reliability**. This reduces the risk of unexpected downtime.

---

#### **Cons**

1. **Limited User Memory (Compared to Higher-End Models)**

The **8 MB user memory** (standard) may be **insufficient for very large programs** with extensive **trend logging, historical data, or complex math operations**. Users may need to **purchase additional memory modules** (e.g., **1769-L32E**) to expand storage.

2. **No Onboard Real-Time Clock (RTC) in Basic Model**

The **standard 1746-IM8** does **not include a real-time clock (RTC)**. If time-stamping or scheduling is required, an **optional RTC module (1769-RTC)** must be added, increasing cost.

3. **Dependence on Rockwell Software**

Programming and configuration are **tied to Rockwell s Studio 5000 or RSLogix 5000**, which may require a **license**. While third-party tools (e.g., **CodeSys, Ignition**) can interface with it via **EtherNet/IP**, full native support is limited outside Rockwell s ecosystem.

4. **Physical Size and Space Constraints**

The **CompactLogix 5370** is **larger than some micro-PLCs** (e.g., **Allen-Bradley Micro800**) but **smaller than ControlLogix**. If space is extremely limited, alternative solutions may be considered.

5. **Firmware and Compatibility Issues with Newer Systems**

While generally stable, **firmware updates** may occasionally introduce **compatibility issues** with newer **HMIs, drives, or communication protocols**. Always check **Rockwell s documentation** before deploying updates.

6. **Higher Cost Than Basic PLCs (e.g., Micro800, S7-1200)**

Compared to **entry-level PLCs** (e.g., **Allen-Bradley Micro800, Siemens S7-1200**), the **1746-IM8 is more expensive**, though it offers **superior performance and industrial-grade reliability**. For **small-scale or non-critical applications**, a cheaper PLC might suffice.

7. **Learning Curve for New Users**

The **CompactLogix architecture** is **more complex than basic PLCs**, requiring familiarity with **EtherNet/IP, CIP objects, and structured text (ST) or ladder logic (LD)**. Training may be necessary for **programmers unfamiliar with Rockwell s environment**.

8. **Limited Analog Input/Output Channels in Basic Configuration**

The **standard 1746-IM8** has **few analog I/O slots** (unless expanded). Users requiring **high-resolution analog signals** may need to **add dedicated analog modules**, increasing system complexity.

9. **Potential for Obsolescence Over Time**

While **less likely than older PLCs**, Rockwell occasionally **discontinues or merges product lines**. Always verify **support and availability** before committing to a long-term project.

10. **No Built-in Web Server or Direct Cloud Connectivity**

Unlike some newer PLCs (e.g., **Siemens S7-1500 with TIA Portal**), the **1746-IM8 does not natively support direct cloud connectivity or a built-in web interface**. Cloud integration typically requires **third-party gateways or additional hardware**.

---

### **Conclusion**

The **Allen-Bradley 1746-IM8 (CompactLogix 5370)** is a **highly capable, reliable, and scalable PLC** well-suited for **mid-to-large industrial automation applications** where **performance, network integration, and long-term support** are critical. Its **industrial-grade build, EtherNet/IP support, and compatibility with Rockwell s software ecosystem** make it a **strong choice for manufacturing, process control, and machine automation**.

- **Budget-conscious, small-scale applications** (where a **Micro800 or S7-1200** may suffice).

- **Users requiring direct cloud or web-based control** without additional hardware.

- **Applications with extremely high analog I/O requirements** (without expansion modules).

- **Programmers unfamiliar with Rockwell s software environment** (due to a learning curve).

---

### **Recommendation**

You need a **reliable, high-performance PLC** for **industrial automation**.

Your application requires **EtherNet/IP, CIP, or DeviceNet integration**.

You are already using **Rockwell Automation s software (Studio 5000, RSLogix 5000)**.

You anticipate **future expansion** (via additional I/O or memory modules).

**Long-term support and spare parts availability** are a priority.

You need a **lower-cost solution** (e.g., **Micro800, S7-1200, or Siemens S7-1500**).

Your application is **small-scale or non-critical** (where a **basic PLC** is sufficient).

You require **direct cloud or web-based control** without extra hardware.

Your team is **not familiar with Rockwell s programming environment**.

The **1746-IM8 is an excellent choice for most industrial applications** where **reliability, scalability, and network integration** are essential. For users already invested in Rockwell s ecosystem, it offers **the best balance of performance and cost** in its class. However, **careful consideration of memory needs, expansion requirements, and programming expertise** is necessary to ensure it meets your specific application demands.

Details:

Sells new and surplus product develops channels to purchase such. Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. All products are guaranteed to be working but may show signs of use if purchasing a used product. ALLEN BRADLEY 1746-IM8 / 1746IM8 USED DISCONTINUED BY MANUFACTURER 12/31/2014, INPUT MODULE, SLC 5/8 POINT, DIGITAL, 200-250 V AC, 50/60 HZ.

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part #: 1746im8 prices

• $85.01-$184.34

specifications sensoindustria:

• brand: Allen Bradley
• mpn: 1746-im8
• part type: Module

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• # reviews: 197811
• city: 1 Millennium Dr, Willingboro, NJ 08046
• rating: 99.6%

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• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules

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offer sensoindustria:

• quantity: 1
• options: Ship-to-home
• availability: In Stock
• started: April 4, 2026
• sold: 0

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