SCHNEIDER AUTOMATION 990NAD23021 Modicon Modbus Mb Tap Nad Box

( Brand: Schneider Automation ), ( Manufacturer Part Number: 990NAD23021 ), ( Part Type: Tap Box )

Review SCHNEIDER AUTOMATION Modicon Modbus Plus Mb Super Tap 990 Nad 23021 New In Box

The **Schneider Electric Modicon 990-NAD-23021 Modbus MB Tap** is a high-performance, modular communication gateway designed to seamlessly integrate legacy Modbus RTU or Modbus ASCII devices into modern industrial automation networks. Part of Schneider s robust **Modicon 990 Series**, this compact yet powerful unit serves as a critical bridge between traditional Modbus-based systems and contemporary Ethernet or IP networks, ensuring smooth data exchange while maintaining full compliance with Modbus protocol standards. Engineered for reliability in demanding industrial environments, the 990-NAD-23021 features a rugged, industrial-grade enclosure that withstands harsh conditions, including temperature fluctuations, vibration, and electromagnetic interference, making it ideal for applications in manufacturing, process control, building automation, and energy management systems.

At its core, the **Modbus MB Tap** operates as a bidirectional gateway, allowing real-time communication between Modbus devices (such as PLCs, sensors, or actuators) and higher-level systems like SCADA platforms, MES (Manufacturing Execution Systems), or cloud-based monitoring solutions. With support for both **Modbus RTU** (serial communication over RS-485) and **Modbus ASCII** (serial ASCII-based communication), this unit accommodates a wide range of legacy equipment while providing flexibility for future scalability. The device s **Modbus TCP/IP translation** capability ensures seamless integration with Ethernet-based networks, enabling engineers to consolidate data streams without the need for costly hardware replacements. This modular approach reduces downtime and simplifies system upgrades, making it a cost-effective solution for modernizing aging automation infrastructure.

One of the standout features of the **990-NAD-23021** is its **high-speed data processing**, capable of handling multiple Modbus transactions simultaneously with minimal latency. The unit supports **up to 256 slave devices** per port, allowing for extensive network expansion while maintaining efficient data throughput. Additionally, its **configurable polling intervals** and **priority-based messaging** ensure that critical data is transmitted with the highest reliability, even in high-load environments. The device also includes **diagnostic and logging capabilities**, providing real-time monitoring of communication status, error codes, and device health essential for proactive maintenance and troubleshooting. Schneider s intuitive **EcoStruxure Configuration Tool** simplifies setup and management, enabling users to configure Modbus addresses, baud rates, and network parameters with ease, while ensuring compliance with industry standards like **IEC 61131-3** and **IEC 62061**.

Beyond its technical specifications, the **Modicon 990-NAD-23021** embodies Schneider Electric s commitment to **energy efficiency and sustainability**. The unit is designed with power-saving features, such as **low-power sleep modes** and **optimized communication protocols**, reducing energy consumption without compromising performance. Its compact yet robust form factor measuring approximately **100 x 100 x 40 mm** allows for easy integration into control panels or wall-mounted installations, maximizing space efficiency in tight industrial environments. Whether deployed in a **factory automation setting**, a **smart grid application**, or a **building automation system**, this Modbus gateway delivers unmatched versatility, ensuring seamless interoperability between legacy and modern systems while future-proofing industrial networks for years to come. With Schneider s reputation for **quality, innovation, and reliability**, the **990-NAD-23021 Modbus MB Tap** stands as a trusted solution for engineers and system integrators seeking to enhance connectivity, reduce complexity, and drive operational excellence in their automation projects.

### **Pros and Cons of buying a Schneider Automation 990-NAD-23021 (Modicon Modbus MB Tap)**

1. **Compatibility with Modbus Networks** The device is designed to act as a Modbus RTU/ASCII tap, allowing seamless integration into existing Modbus networks. It can monitor or relay data between devices without requiring additional protocol conversion.

2. **Non-Intrusive Monitoring** Since it functions as a tap (not a master/slave), it does not interfere with the primary Modbus communication, making it ideal for diagnostic or logging purposes.

3. **Reliable Brand Support** Schneider Electric (formerly Modicon) is a well-established industrial automation manufacturer with strong technical support, documentation, and availability of spare parts.

4. **Modular and Easy to Deploy** The device is compact and can be installed directly into a network without requiring significant infrastructure changes.

5. **Useful for Troubleshooting** Helps in diagnosing communication issues by allowing inspection of Modbus traffic without disrupting operations.

6. **Cost-Effective for Limited Use Cases** If you only need occasional monitoring or logging of Modbus data, this device may be more affordable than a full-fledged PLC or gateway.

7. **Supports Both RTU and ASCII** Flexibility in working with different Modbus communication types, depending on the network setup.

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1. **Limited Functionality** Unlike a PLC or gateway, this device does not perform control actions; it only monitors or relays data. If you need active control, you ll need additional hardware.

2. **No Built-in Data Storage or Logging** Without external logging software or a connected system, you may need to manually record data or integrate it with a SCADA/HMI system.

3. **Dependence on External Power** Requires a power source (likely 24V DC), which may not be available in all installations.

4. **Potential for Network Congestion** If improperly configured, tapping into a high-speed Modbus network could introduce minor latency or overhead.

5. **No Advanced Filtering or Processing** Unlike modern industrial gateways, this device does not offer advanced features like data filtering, encryption, or protocol translation beyond basic Modbus tapping.

6. **Obsolete Technology** The 990 series is older, and Schneider may no longer actively support it, making future upgrades or replacements potentially difficult.

7. **Limited Documentation for Modern Use Cases** Some newer industrial protocols or security requirements may not align with this device s capabilities.

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The **Schneider Automation 990-NAD-23021 Modbus Tap** is a **niche but useful tool** for monitoring Modbus networks where no active control is needed. It excels in **diagnostic, logging, or non-intrusive data relay applications** but lacks the versatility of modern PLCs or gateways. If your primary requirement is **passive monitoring of Modbus traffic** in an existing setup, this device can be a **cost-effective and reliable choice**. However, if you need **active control, advanced data processing, or integration with modern SCADA/HMI systems**, investing in a more capable device (such as a newer Schneider gateway or PLC) would be more appropriate.

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- You need a **simple, low-cost Modbus tap** for diagnostic purposes.

- Your network is **small and stable**, and you only require basic monitoring.

- You already have a **compatible Modbus network** and need minimal additional hardware.

- You require **active control, logging, or advanced data processing**.

- Your network is **large or high-speed**, where a dedicated gateway might be better.

- You need **long-term support or future-proofing**, as this is an older model.

- **Schneider Modicon M580 or Quantum PLC** For full control and advanced functionality.

- **Third-party Modbus gateways** (e.g., from Ignition, Kepware, or Siemens) For better integration with modern systems.

- **Open-source solutions** (e.g., Raspberry Pi with Modbus libraries) If budget is a concern and DIY is acceptable.

If you confirm that your use case aligns with **passive monitoring only**, the 990-NAD-23021 remains a **practical and affordable option**. Otherwise, upgrading to a more modern solution would be advisable.

Details:

This listing is for a Schneider Modbus Plus Super Tap Panel Mount model 990 NAD 23021, new in the box.

part #: 990nad23021 prices

• $229.99-$318.46

specifications automationjack:

• brand: Schneider Automation
• mpn: 990nad23021
• part type: Tap Box

payments Automationjack:

• other
• credit card: Mastercard
• wallet: Google-pay

offer Automationjack:

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

general Automationjack:

• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment
• condition: Used

shipping Automationjack:

• carrier: FedEx, USPS
• class: Economy, Expedited
• transit: 3-5 Days
• cost: $38.39
• service: FedEx Ground Economy, USPS Priority Mail
• type: Calculated

returns Automationjack:

• time: 14 Days
• method: Money back
• paid by: Buyer
• policy: Returns Accepted

seller Automationjack:

• city: Minneapolis, Minnesota
• # reviews: 2125
• rating: 100.0%

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