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  3. ALLEN BRADLEY 1738-485ASCM12

ALLEN BRADLEY 1738-485ASCM12 Plc Modules

1738-485ascm12 Allen Bradley / 1738485ascm12 Used

( Brand: Allen Bradley ), ( Manufacturer Part Number: 1738-485ASCM12 ), ( Part Type: Module )

Review ALLEN BRADLEY 1738485ascm12 Used

The **Allen-Bradley 1738-485ASC-M12** is a high-performance, modular **CompactLogix 1738** programmable logic controller (PLC) designed for industrial automation applications requiring robust, scalable, and reliable control solutions. Part of Rockwell Automation s **CompactLogix** series, this specific model features a **1738-485ASC** base unit paired with a **M12** communication module, offering enhanced connectivity and flexibility for modern manufacturing environments. The **1738-485ASC** base unit is a **12-slot chassis** that supports a variety of I/O modules, allowing engineers to configure the system precisely to match their automation needs whether for discrete manufacturing, process control, or machine-level automation. With a **1.5 GHz** dual-core processor and **1 GB** of RAM (expandable to **2 GB**), this PLC delivers high-speed processing and efficient execution of control logic, making it ideal for applications demanding real-time responsiveness, such as motion control, HMI integration, or complex sequencing operations.

The **M12** communication module integrated into this unit provides **EtherNet/IP** connectivity, enabling seamless integration with other Rockwell Automation devices, including **ControlLogix**, **CompactLogix**, **Studio 5000**, and **FactoryTalk View** systems. This module supports **full-duplex Ethernet communication** with a **10/100 Mbps** data transfer rate, ensuring reliable and high-speed data exchange for industrial networks. Additionally, the **M12** module includes **EtherNet/IP aliasing**, which simplifies device identification and reduces network configuration complexity, making it easier to implement distributed control architectures. The **1738-485ASC-M12** also supports **CIP (Common Industrial Protocol)** for advanced communication features, including **CIP Sync** for precise timing synchronization and **CIP Motion** for integrated motion control, further enhancing its suitability for applications requiring coordinated multi-axis motion.

Built to withstand the rigors of industrial environments, this PLC is housed in a **compact, rugged enclosure** that meets **NEMA 4X** and **IP65** standards, providing protection against dust, water, and harsh operating conditions. The **1738-485ASC** base unit includes **two integrated Ethernet ports**, one of which is occupied by the **M12** module, while the other can be used for additional networking or as a backup connection. The system also features **two serial ports (RS-232/422/485)** for legacy device integration, ensuring compatibility with older equipment while supporting modern communication protocols. With **128 MB** of onboard memory (expandable via optional **1738-MEM** modules), the **1738-485ASC-M12** provides ample storage for ladder logic programs, data tables, and configuration files, reducing the need for external memory devices.

Programming and configuration for this PLC are streamlined through **Rockwell Automation s Studio 5000 Logix Designer**, a powerful development environment that supports **ladder logic (LAD), structured text (ST), function block diagrams (FBD), and sequential function charts (SFC)**. The **EtherNet/IP** connectivity allows for easy remote programming, monitoring, and troubleshooting, while **FactoryTalk View** integration enables the creation of **human-machine interfaces (HMIs)** for operator interaction. The **1738-485ASC-M12** also supports **remote I/O** and **distributed control** architectures, enabling scalable solutions where I/O modules can be placed closer to the process for reduced wiring complexity and improved reliability. Additionally, its compatibility with **Rockwell s Safety Integration System (SIS)** allows for the integration of safety functions, ensuring compliance with **ISO 13849** and **IEC 61508** standards for safety-critical applications.

Overall, the **Allen-Bradley 1738-485ASC-M12** is a versatile, high-performance PLC designed for industrial automation professionals who require a **scalable, reliable, and future-proof** control solution. Whether deployed in **discrete manufacturing, process control, or motion-intensive applications**, this unit combines **powerful processing capabilities, robust networking, and seamless integration** with Rockwell s ecosystem of automation products. Its **compact yet expandable architecture**, **industrial-grade durability**, and **advanced communication features** make it an excellent choice for engineers seeking a **cost-effective yet high-performance** PLC for modern automation challenges.

### **Pros and Cons of buying a Allen-Bradley 1738-485ASC-M12 (CompactLogix 5370 Controller)**

#### **Overview**

The **Allen-Bradley 1738-485ASC-M12** is a **CompactLogix 5370 series PLC** with a **12-slot backplane**, **EtherNet/IP communication**, and **ASCII serial communication** capabilities. It is a mid-range controller designed for industrial automation applications requiring modular expansion, high-speed networking, and serial communication.

---

### **Pros**

1. **Modular Expansion Capability**

- The **12-slot backplane** allows for flexible I/O expansion, accommodating a wide range of **Allen-Bradley and third-party modules** (digital, analog, high-speed, safety, etc.).

- Supports **1769-I/O modules**, enabling customization for specific automation needs.

2. **High-Speed Ethernet/IP Communication**

- Built-in **EtherNet/IP port** ensures fast, reliable industrial networking with **V10/V20 protocol support**, compatible with **Rockwell Automation s ControlLogix, CompactLogix, and other EtherNet/IP devices**.

- Enables **real-time data exchange** with HMIs, SCADA systems, and other PLCs.

3. **ASCII Serial Communication (ASC-M12 Module)**

- The **ASC-M12 module** provides **RS-232/RS-485 ASCII communication**, useful for interfacing with **legacy equipment, barcode scanners, printers, or non-Rockwell devices**.

- Supports **modbus RTU/ASCII** and other serial protocols via configuration.

4. **CompactLogix 5370 Platform Benefits**

- **Faster processing** compared to older CompactLogix models (e.g., 5370 vs. 5360).

- **Improved memory capacity** (up to **16MB user memory**), allowing for more complex programs.

- **Enhanced security features** (user roles, password protection, firmware updates).

- **Compatibility with Studio 5000** (Rockwell s latest engineering software).

5. **Reliability & Industrial Build**

- **Allen-Bradley is a trusted brand** with **long-term support** and availability of spare parts.

- **Wide operating temperature range** (-25 C to 60 C), making it suitable for harsh industrial environments.

- **High MTBF (Mean Time Between Failures)** due to robust hardware design.

6. **Backward & Forward Compatibility**

- Works with **older CompactLogix programs** (with minor adjustments).

- Supports **future Rockwell Automation software updates**.

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

- More affordable than **ControlLogix 5570/5580** but still offers **high performance**.

- **Lower total cost of ownership** compared to non-Rockwell PLCs requiring additional gateways for EtherNet/IP.

8. **Easy Integration with Rockwell Ecosystem**

- Seamless integration with **FactoryTalk View SE/ME, View Studio, and other Rockwell software**.

- Supports **remote I/O, distributed control, and cloud connectivity** via **FactoryTalk AssetCentre**.

---

### **Cons**

1. **Limited Native High-Speed I/O**

- Unlike **ControlLogix**, the **CompactLogix 5370 does not have native high-speed I/O (HSI) slots** (e.g., for motion control or high-speed counting).

- Requires **additional modules (e.g., 1769-H1 or 1769-H2)** for advanced motion or high-speed applications.

2. **ASCII Module Requires Additional Licensing (If Needed)**

- The **ASC-M12 module** may require **additional licensing or firmware activation** depending on the application.

- Some **serial communication features** (e.g., advanced Modbus) may need **Studio 5000 Licensing**.

3. **Higher Power Consumption Than Smaller PLCs**

- Consumes more power than **microPLCs (e.g., 1769-L32E)** or **smaller CompactLogix models (e.g., 5370 with fewer slots)**.

- May require **dedicated power supplies** in some setups.

4. **Deprecated in Favor of Newer Models**

- Rockwell Automation has **phased out some CompactLogix 5370 models** in favor of **CompactLogix 5480/5580** (which offer **better performance, more slots, and USB connectivity**).

- **Long-term support may be reduced** compared to newer controllers.

5. **Potential Software Compatibility Issues**

- **Studio 5000 v30 ** may have **minor quirks** when working with older CompactLogix projects.

- Some **third-party drivers or protocols** may require **additional configuration**.

6. **Higher Upfront Cost Than Basic PLCs**

- More expensive than **basic microPLCs (e.g., Siemens S7-1200, Mitsubishi FX)** but **less expensive than ControlLogix**.

- **Module costs add up** if expanding I/O significantly.

7. **Physical Size & Installation Constraints**

- **Bulkier than microPLCs**, requiring **more rack space** in control panels.

- **12-slot backplane** may be **overkill for simple applications**, leading to **unused slots**.

8. **Dependence on Rockwell s Proprietary Ecosystem**

- **Less open-standard flexibility** compared to **Siemens, Mitsubishi, or Schneider Electric PLCs**.

- **Third-party module support** may be limited outside Rockwell s ecosystem.

---

### **Conclusion**

The **Allen-Bradley 1738-485ASC-M12** is a **strong mid-range PLC** ideal for applications requiring:

**Modular I/O expansion** (12 slots)

**EtherNet/IP networking** for industrial automation

**ASCII/serial communication** for legacy or non-Rockwell devices

**Studio 5000 compatibility** with Rockwell s ecosystem

**Reliable, industrial-grade performance**

However, it may **not be the best choice** if:

**High-speed motion or advanced I/O** is required (needs additional modules)

**Budget is tight** (basic microPLCs may suffice)

**Open-standard flexibility** is preferred (consider Siemens, Mitsubishi, or Schneider)

**Future-proofing is critical** (newer **CompactLogix 5480/5580** may be better)

---

### **Recommendation**

**Buy the 1738-485ASC-M12 if:**

- You need a **reliable, modular PLC** with **EtherNet/IP and serial communication**.

- Your application requires **12 I/O slots** for expansion.

- You are **already using Rockwell Automation s ecosystem** (FactoryTalk, Studio 5000).

- You need **ASCII/serial connectivity** for legacy equipment.

**Consider alternatives if:**

- **High-speed motion or advanced I/O** is needed **ControlLogix 5570/5580** or **CompactLogix 5480**.

- **Budget is limited** **Allen-Bradley 1769-L32E (microPLC)** or **Siemens S7-1200**.

- **Open-standard protocols (Modbus TCP, OPC UA)** are required **Schneider Electric Modicon, Siemens S7-1500, or Mitsubishi FX5U**.

- **Future upgrades** are a priority **CompactLogix 5480 (USB, more slots, better performance)**.

**Final Verdict:**

The **1738-485ASC-M12 remains a solid choice** for **mid-range industrial automation** where **Rockwell s ecosystem and modularity** are key. However, **evaluate newer models** if long-term scalability is a concern. Always **verify module availability and software compatibility** before purchasing.

Details:

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ALLEN BRADLEY 1738-485ASCM12 / 1738485ASCM12 USED SPECIALTY I/O MODULES, 1738 ARMORPOINT, SERIAL MODULE, LINK INTERFACE CHANNEL - RS485, DC MICRO M12.

part #: 1738485ascm12 prices

  • $179.13-$217.43

specifications sensoindustria:

  • brand: Allen Bradley
  • mpn: 1738-485ascm12
  • part type: Module

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offer sensoindustria:

  • quantity: 1
  • started: February 5, 2026
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part type: module,
category: business & industrial > plcs hmis > plc peripheral modules > plc input output modules, sku: 20563580215648713,
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  • Used. Offer #1 priced at $179.13 + $12.90 shipping estimate = $192.03* total. FACTORY WARRANTY MAY NOT APPLY ALLEN BRADLEY / 1738485ASCM12 (USED) SPECIALTY I/O MODULES, 1738 ARMORPOINT, SERIAL MODULE, SERIAL LINK INTERFACE CHANNEL - RS485, DC MICRO (M12).+$12.90 shipping
  • Seller refurbished. Offer #2 priced at $217.43 + $36.68 shipping estimate = $254.11* total. +$36.68 shipping

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