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  3. MODICON NW-BM85-S485

MODICON NW-BM85-S485 Schneider Electric

Nw-bm85-s485 Modicon Schneider Electric / Nwbm85s485 Used

( Brand: Modicon ), ( Manufacturer Part Number: NW-BM85-S485 )

Review MODICON Schneider Electric Nwbm85s485 Used

The **Schneider Electric Modicon NW-BM85-S485** is a high-performance, industrial-grade communication module designed to seamlessly integrate with Schneider Electric s EcoStruxure architecture, enabling robust and scalable automation solutions for modern manufacturing and process control environments. This compact yet powerful **Modbus RTU to Ethernet/IP gateway** bridges the gap between legacy Modbus RTU devices and contemporary Ethernet-based networks, facilitating seamless data exchange while maintaining full compatibility with existing infrastructure. Built with Schneider Electric s signature reliability and engineering precision, the NW-BM85-S485 is engineered to withstand the harsh conditions of industrial settings, including temperature fluctuations, electrical noise, and mechanical stress, ensuring uninterrupted operation in demanding applications such as discrete manufacturing, process automation, or energy management systems.

At its core, the NW-BM85-S485 supports **Modbus RTU (serial communication)** on its RS-485 port, allowing it to communicate bidirectionally with a wide range of PLCs, sensors, and field devices that adhere to the Modbus protocol. Simultaneously, it provides **Ethernet connectivity** via its 10/100 Mbps auto-sensing port, enabling integration with Ethernet/IP networks, Schneider Electric s EcoStruxure Machine, or other industrial Ethernet-based systems. This dual-protocol capability eliminates the need for costly protocol conversions or intermediate gateways, streamlining system architecture and reducing complexity. The module s **Ethernet/IP master/slave functionality** ensures compatibility with Rockwell Automation s ControlLogix, CompactLogix, and other Ethernet/IP devices, while its **Modbus RTU slave/master mode** allows flexible configuration depending on the application s requirements whether it s acting as a gateway to collect data from multiple RTU devices or as a bridge to forward commands to legacy systems.

One of the standout features of the NW-BM85-S485 is its **high-speed data throughput**, capable of handling substantial data volumes with minimal latency, making it ideal for real-time monitoring and control applications. The module supports **up to 256 Modbus RTU devices** on a single RS-485 bus, with configurable baud rates (from 1200 to 115200 bps) and parity settings to match diverse industrial environments. Its **Ethernet/IP connection** leverages Schneider Electric s EcoStruxure architecture, allowing for advanced features such as **remote diagnostics, firmware updates over the network, and integration with Schneider s Unity Pro engineering software** for streamlined configuration and troubleshooting. Additionally, the module includes **built-in security measures**, including support for **IEC 62443-compliant security policies**, ensuring protection against unauthorized access and data breaches in critical infrastructure.

The NW-BM85-S485 is housed in a **durable, rugged metal enclosure** with a **connectorized RS-485 port** and a **gigabit Ethernet port**, designed for easy installation in control panels, junction boxes, or directly on machine frames. Its **low-power consumption** and **compact form factor** make it space-efficient, while its **wide operating temperature range (-40 C to 70 C)** ensures reliable performance in extreme environments. The module s **LED indicators** provide real-time status monitoring for Ethernet, Modbus RTU, and power, simplifying troubleshooting and maintenance. Furthermore, Schneider Electric s **lifetime support and software updates** guarantee long-term compatibility with evolving industrial standards and protocols, ensuring that the NW-BM85-S485 remains a future-proof investment for automation engineers.

Whether deployed in a **smart factory, energy management system, or process control application**, the **Schneider Electric Modicon NW-BM85-S485** serves as a bridge between legacy and modern automation technologies, delivering **seamless interoperability, high reliability, and scalable performance**. Its integration with Schneider Electric s EcoStruxure platform also enables advanced functionalities such as **predictive maintenance, energy optimization, and remote asset management**, enhancing operational efficiency and reducing downtime. By combining **industrial-grade robustness with cutting-edge communication capabilities**, the NW-BM85-S485 empowers engineers to build **future-ready automation solutions** that adapt to evolving industry demands while maintaining backward compatibility with existing systems.

The **Modicon NW-BM85-S485** (Schneider Electric) is a modular bus module designed for use in the **Modbus RTU/RS-485** communication network, commonly integrated into Schneider Electric s **Modicon Quantum, EcoStruxure, or other PLC systems**. Below is a detailed analysis of its pros and cons, followed by a conclusion and recommendation.

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### **Pros of the NW-BM85-S485**

1. **Compatibility with Schneider Ecosystem**

The module is specifically designed for seamless integration with Schneider Electric s **Quantum, EcoStruxure, or Modicon M580/M340** PLCs. It supports **Modbus RTU/RS-485** communication, a widely used protocol in industrial automation, ensuring compatibility with existing systems.

2. **Modular and Scalable Design**

As part of Schneider s modular bus system, it allows for easy expansion of communication ports without replacing the entire PLC. This modularity simplifies upgrades and maintenance.

3. **Reliable RS-485 Communication**

RS-485 is a robust, long-distance communication standard (up to **1,200 meters** with repeaters) that is less susceptible to noise compared to RS-232. This makes it ideal for industrial environments with harsh electrical conditions.

4. **Support for Multiple Devices**

The module can connect multiple **Modbus RTU devices** (sensors, actuators, HMI panels, etc.) on the same bus, reducing wiring complexity and improving system flexibility.

5. **Easy Installation and Configuration**

Schneider Electric provides **EcoStruxure Machine Expert** and **Unity Pro** software tools for easy configuration, monitoring, and troubleshooting. The module plugs into a standard bus slot, requiring minimal additional hardware.

6. **Industrial-Grade Build**

Schneider Electric modules are built to withstand **temperature extremes (-40 C to 70 C)**, **vibration**, and **electromagnetic interference**, making them suitable for harsh industrial environments.

7. **Low Maintenance**

Since it is a passive communication module, it has no moving parts and requires minimal maintenance beyond periodic firmware updates (if applicable).

8. **Cost-Effective for Modbus Networks**

Compared to proprietary communication modules, the NW-BM85-S485 offers a cost-effective way to extend Modbus RTU connectivity within a Schneider PLC ecosystem.

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### **Cons of the NW-BM85-S485**

1. **Limited to Schneider Ecosystem**

The module is **not compatible** with non-Schneider PLCs (e.g., Siemens, Allen-Bradley, or third-party systems) unless interfaced via additional converters. This can be restrictive if integration with other brands is required.

2. **Single Communication Protocol**

It supports **only Modbus RTU/RS-485**, meaning it cannot communicate via **Ethernet/IP, PROFIBUS, CANbus, or other industrial protocols** without additional hardware. This limits its use in mixed-protocol environments.

3. **Potential Bus Contention Issues**

Since Modbus RTU is a **multi-master, single-slave** protocol, if multiple devices attempt to communicate simultaneously, **collisions** can occur, leading to data corruption. Proper bus termination and device polling strategies are required.

4. **No Built-In Security Features**

Modbus RTU is **not inherently secure** and lacks encryption or authentication. In unsecured networks, it is vulnerable to **eavesdropping, spoofing, or unauthorized access**. Additional security measures (e.g., firewalls, VPNs) may be needed.

5. **Firmware Dependency**

The module s functionality relies on the **PLC s firmware and software support**. If Schneider discontinues support for the PLC model or Modbus RTU, the module may become obsolete.

6. **Physical Slot Requirement**

The module occupies a **bus slot** in the PLC, which could be used for other functions. In systems with limited slots, this may require trade-offs in functionality.

7. **No Built-In Diagnostics for RS-485**

While Schneider s software provides some monitoring, **troubleshooting RS-485 issues** (e.g., short circuits, improper termination) may require external tools like oscilloscopes or multimeters.

8. **Potential Latency in Large Networks**

In **long RS-485 buses** (exceeding 1,200 meters without repeaters), signal degradation can occur, leading to **communication errors or delays**. Additional repeaters or signal conditioners may be needed.

---

### **Conclusion**

The **Schneider Electric NW-BM85-S485** is a **reliable, modular, and cost-effective** solution for extending **Modbus RTU/RS-485 communication** within a **Schneider Electric PLC ecosystem**. Its strengths lie in **seamless integration, industrial durability, and scalability**, making it ideal for **automation systems where Modbus is the primary protocol**.

However, its **lack of multi-protocol support, limited security, and dependency on Schneider s ecosystem** may be drawbacks for users requiring **interoperability with other brands or advanced networking protocols**. Additionally, **network management and security considerations** must be addressed to prevent common Modbus vulnerabilities.

---

### **Recommendation**

**Buy the NW-BM85-S485 if:**

- You are working **exclusively within a Schneider Electric PLC system** (e.g., Quantum, EcoStruxure, M580).

- Your application **requires Modbus RTU/RS-485 communication** for sensors, HMIs, or other devices.

- You need a **modular, low-maintenance solution** with **long-distance communication capabilities**.

- Your network is **secured** (e.g., isolated from untrusted networks, with proper termination and polling strategies).

**Avoid or Consider Alternatives if:**

- You need **multi-protocol support** (Ethernet/IP, PROFIBUS, etc.), in which case a **Schneider Ethernet module (e.g., NW-BM85-EIP)** or a **third-party Modbus-to-Ethernet gateway** may be better.

- **Security is a critical concern**, and you require **encrypted communication** (consider **Modbus TCP over VPN or Schneider s Secure Connect**).

- You are integrating with **non-Schneider PLCs**, as additional **protocol converters** (e.g., Allen-Bradley s Modbus adapter) will be needed.

- Your **RS-485 network is very large or noisy**, and you may need **signal repeaters or conditioners**.

**Alternative Considerations:**

- For **Ethernet-based Modbus**, use the **NW-BM85-EIP** (Ethernet/IP) or **NW-BM85-MOD** (Modbus TCP).

- For **higher security**, pair the module with **Schneider s Secure Connect** or a **firewall appliance**.

- If **cost is a major concern**, evaluate **third-party Modbus RTU adapters** (e.g., from WAGO, Beckhoff) that may offer similar functionality at a lower price.

**Final Verdict:**

The **NW-BM85-S485 is a solid choice for Schneider Electric users needing reliable Modbus RTU/RS-485 communication**, provided the system constraints (protocol, security, and ecosystem compatibility) align with its capabilities. For broader industrial automation needs, additional modules or security measures may be necessary.

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. Call to use a shipping service other than the ones listed. All products are guaranteed to be working but may show signs of use if purchasing a used product.

SCHNEIDER ELECTRIC NW-BM85-S485 / NWBM85S485 USED DISCONTINUED BY MANUFACTURER SINCE 04/07/2019, MBUS PROG BRIDGE/MUX SUPRS485, QUANTUM SERIES, RS485, MULTIPLEXER, HAS NOT BEEN REPLACED.

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category: business & industrial > plcs hmis > plc peripheral modules > plc input output modules, sku: 20880502544109713,
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