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Mitsubishi QJ71MT91 MELSECNET/H Optical Loop Network Module for industrial automation

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Mitsubishi QJ71MT91

by Mitsubishi Electric

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OverviewElevate your industrial automation infrastructure with the Mitsubishi QJ71MT91 MELSECNET/H Optical Loop Network Module. This module is specifically engineered to deliver robust, high-speed optical loop communication, seamlessly integrating with Mitsubishi’s acclaimed Q Series PLCs. It significantly upgrades the performance and dependability of distributed control systems by guaranteeing swift, noise-resistant data transmission, essential for today's industrial settings. The advanced optical technology ensures stable communication across diverse programmable controllers, human-machine interfaces (HMIs), and field devices, making it a critical asset for intricate automation architectures.Key Features Network Protocol: MELSECNET/H (Optical loop) – Optimized for demanding industrial network operations. Maximum Connections: Accommodates up to 64 stations per network, facilitating extensive expansion. Data Rate: Rapid 25 Mbps for real-time data processing and control applications. Interference Immunity: Exceptional resistance to electrical noise and interference, courtesy of advanced optical communication. Network Design: Featuring a fault-tolerant loop configuration that maintains network integrity even with individual point failures. Integrated Diagnostics: Comprehensive monitoring of communication and module status supports proactive maintenance and efficient troubleshooting. Technical Specifications Model Identifier: QJ71MT91 Product Line: MELSEC Q Series Communication Method: Optical fiber loop, providing secure and interference-free data transfer. Extended Reach: Network distance can be extended up to 30 km with repeaters, offering flexibility for large-scale operations. Fiber Compatibility: Compatible with multimode fiber (62.5/125 µm), commonly used in industrial environments. Connector Type: Standard ST optical connectors for secure and straightforward installation. Power Input: Efficiently powered by 5V DC directly from the base unit. Operating Temperature: Reliably functions in industrial conditions from 0°C to 55°C. Installation Method: Designed for convenient rack-mounted setup on a Q Series base. Weight: Approximately 0.25 kg (0.55 lbs), contributing to a lighter system. Certifications: CE and UL certified, affirming compliance with international safety and quality standards. Applications Distributed I/O Management: Efficiently oversee inputs and outputs across geographically dispersed industrial setups. Facility-Wide Automation Networks: Construct comprehensive, high-speed networks for entire manufacturing sites. Data-Intensive Machine-to-Machine Networks: Facilitate quick and dependable communication between crucial production machinery. High-Speed Supervisory Control: Enable real-time oversight and control of complex industrial processes. Redundant Network Architectures: Implement highly reliable network designs to minimize downtime and enhance operational continuity. Why Choose This Model?The Mitsubishi QJ71MT91 distinguishes itself as a premier choice for industrial networking, combining high performance, steadfast reliability, and advanced functionalities. Its fast optical communication capabilities guarantee real-time data processing, which is crucial for critical control applications where every millisecond counts. The innovative loop redundancy design delivers unmatched fault tolerance, ensuring continuous operation even if a single point within the network fails. This directly translates to less downtime and increased productivity. Moreover, its industrial-grade reliability means it is built to endure demanding industrial environments, ensuring lasting performance and durability. Lastly, the QJ71MT91 offers a flexible system architecture, supporting wide-area control system designs that are easily scalable and adaptable to evolving operational requirements. Opting for the QJ71MT91 represents an investment in a robust, high-speed, and future-ready solution.Order NowUpgrade your industrial communication capabilities today. Contact us for pricing and availability of the Mitsubishi QJ71MT91 MELSECNET/H Optical Loop Network Module.FAQWhat is the primary function of the Mitsubishi QJ71MT91?The QJ71MT91 is an optical loop network module designed to provide high-speed, reliable data exchange within Mitsubishi Q Series PLC automation systems.What type of network does the QJ71MT91 support?It supports the MELSECNET/H (Optical loop) network type, optimized for industrial communication with high noise resistance.What is the maximum transmission speed of this module?The module operates at a blazing-fast 25 Mbps, essential for real-time data processing in critical applications.Can the QJ71MT91 handle large network configurations?Yes, it supports up to 64 stations per network and can extend network distances up to 30 km with repeaters, making it suitable for large-scale operations.What are the key advantages of using an optical loop network?Optical loop networks offer superior noise immunity, high data transfer rates, and fault-tolerant configurations, ensuring stable and continuous operation even in challenging industrial environments.

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PRODUCT DETAILS

Mitsubishi QJ71MT91

Overview

This is a genuine Mitsubishi Electric component from the MELSEC PLCs family. PalmPartsSolution stocks it in new, refurbished, and surplus condition with tested warranty and same-day shipping on in-stock units.

Whether you are sourcing a like-for-like replacement for an existing installation, an emergency spare to keep a line running, or a qualified part for a new build, our team can confirm availability, revision, and lead time before you order.

Key Features

  • Genuine Mitsubishi Electric catalog part
  • Tested before shipment
  • Backed by PalmPartsSolution warranty
  • Cross-reference and revision assistance available
  • Compatible with the broader Mitsubishi Electric automation ecosystem
  • Engineered to integrate inside MELSEC PLCs installations

Compatibility

When ordering, match the full catalog/part number, hardware revision, and firmware revision called out by your Mitsubishi Electric equipment. Where applicable, confirm:

  • Input/output voltage and current rating
  • Communication protocol and network role
  • Mounting form factor and footprint
  • Operating temperature, humidity, and IP rating
  • Required certifications (UL, CE, ATEX, marine, etc.)

Not sure which revision you need? Send us the catalog number on the nameplate and we will confirm the correct match.

Replacement Information

Three ways to source this part through PalmPartsSolution:

  1. Exact replacement — same Mitsubishi Electric catalog number, new or refurbished, tested and warrantied
  2. Form-fit-function equivalent — alternate revision or build that drops in without code changes
  3. Engineered migration — current-generation Mitsubishi Electric platform with documented conversion notes for the MELSEC PLCs family

Contact our engineering team if you need help choosing between these tracks.

Technical Specifications

  • Model Identifier: QJ71MT91
  • Product Line: MELSEC Q Series
  • Communication Method: Optical fiber loop, providing secure and interference-free data transfer.
  • Extended Reach: Network distance can be extended up to 30 km with repeaters, offering flexibility for large-scale operations.
  • Fiber Compatibility: Compatible with multimode fiber (62.5/125 µm), commonly used in industrial environments.
  • Connector Type: Standard ST optical connectors for secure and straightforward installation.
  • Power Input: Efficiently powered by 5V DC directly from the base unit.
  • Operating Temperature: Reliably functions in industrial conditions from 0°C to 55°C.
  • Installation Method: Designed for convenient rack-mounted setup on a Q Series base.
  • Weight: Approximately 0.25 kg (0.55 lbs), contributing to a lighter system.
  • Certifications: CE and UL certified, affirming compliance with international safety and quality standards.

Applications

  • Distributed I/O Management: Efficiently oversee inputs and outputs across geographically dispersed industrial setups.
  • Facility-Wide Automation Networks: Construct comprehensive, high-speed networks for entire manufacturing sites.
  • Data-Intensive Machine-to-Machine Networks: Facilitate quick and dependable communication between crucial production machinery.
  • High-Speed Supervisory Control: Enable real-time oversight and control of complex industrial processes.
  • Redundant Network Architectures: Implement highly reliable network designs to minimize downtime and enhance operational continuity.

Why Choose the QJ71MT91?

The Mitsubishi QJ71MT91 distinguishes itself as a premier choice for industrial networking, combining high performance, steadfast reliability, and advanced functionalities. Its fast optical communication capabilities guarantee real-time data processing, which is crucial for critical control applications where every millisecond counts. The innovative loop redundancy design delivers unmatched fault tolerance, ensuring continuous operation even if a single point within the network fails. This directly translates to less downtime and increased productivity. Moreover, its industrial-grade reliability means it is built to endure demanding industrial environments, ensuring lasting performance and durability. Lastly, the QJ71MT91 offers a flexible system architecture, supporting wide-area control system designs that are easily scalable and adaptable to evolving operational requirements. Opting for the QJ71MT91 represents an investment in a robust, high-speed, and future-ready solution.

Availability & Shipping

  • In stock: QJ71MT91 ready for immediate dispatch from our Florida warehouse.
  • Free USA shipping: FedEx Priority (2–5 business days) and UPS Ground (3–5 business days). Expedited options available at checkout.
  • Worldwide delivery: FedEx International Priority (1–5 days), UPS International Priority (3–5 days), and USPS International (5–10 days) — rates calculated at checkout.
  • Bulk pricing: Volume discounts on request — contact our sales team for quantity quotes.
  • Buy with confidence: Every QJ71MT91 ships with a 1-Year PALM Parts warranty and a 30-day return window.
SUPPORT

Frequently Asked Questions — Mitsubishi Electric

The QJ71MT91 is an optical loop network module designed to provide high-speed, reliable data exchange within Mitsubishi Q Series PLC automation systems.

Machine down? We ship parts the same day.

New, surplus, and refurbished Mitsubishi Electric inventory in stock. Request a quote or speak directly with an automation specialist for emergency sourcing.

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Product Condition & Firmware

All products are sold as new unless stated otherwise. Original manufacturer packaging may show signs of handling, storage, or shelf wear. Date codes and series may vary from current factory production. PALM Parts does not guarantee the presence, version, or compatibility of any firmware on PLC or automation products.

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