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    AI Overview
    The Mitsubishi Q68B is
    an 8-slot extension rack/backplane for the Mitsubishi MELSEC-Q Series PLC, acting as the physical foundation where CPU, I/O, and communication modules connect, allowing expansion of a PLC system, not a standalone controller itself but a core component for building a modular PLC or PAC system. It provides power and communication pathways, essential for increasing I/O points and functionality in industrial automation, fitting into the broader categories of PLCs (Programmable Logic Controllers) and PACs (Programmable Automation Controllers) by enabling modular expansion. 
    What it is: 
    • Extension Rack/Backplane: The Q68B is a physical housing (rack) that holds various function modules, including the CPU, power supply, and I/O cards.
    • 8 Slots: It provides eight slots for installing these different modules.
    • MELSEC-Q Series: It's specifically designed for Mitsubishi's modular Q-Series, a powerful platform often used for complex PAC-like functions. 
    How it fits PLC/PAC/Dedicated Controller: 
    • PLC: A complete PLC system uses a base rack (like the Q68B) with modules (CPU, I/O) to perform sequential control.
    • PAC: The Q-Series, using racks like the Q68B, can handle advanced functions (motion, process control, data handling) often associated with PACs, offering more than basic PLC tasks.
    • Dedicated Controller: While the Q68B isn't a controller itself, it's the chassis that hosts the CPU module, which is the actual controller; it allows customization for specific industrial needs. 
    Key Function: 
    • Modular Expansion: It lets users add more I/O points, specialized communication modules (Ethernet, DeviceNet), or motion control modules to an existing system by simply plugging them into available slots. 
    In essence, the Q68B is a fundamental building block for scaling and customizing powerful Mitsubishi automation systems. 
    • Q68B - Mitsubishi Electric - Factory Automation Americas
      Please add this item to cart to request a quote or contact us at Mitsubishi-Electric@meau.com for product availability. Q68B. $717...
      MITSUBISHI ELECTRIC Global website
    • Q68B PLC Module/Rack by MITSUBISHI - Radwell International
      Q68B PLCs/Machine Control from MITSUBISHI In Stock, Order Now! Same Day Shipping, 2-Year Warranty - EXTENSION RACK, SERIES Q, 8 SL...
      Radwell International
    • Mitsubishi Q Series Motherboard Module Q68B, PLC, PAC and ...
      Mitsubishi Q Series Motherboard Module Q68B, PLC, PAC and Dedicated Controller * 1, 8, 32, 128, 16, 64, 256. I/O Number. ROM, Flas...
      Alibaba.com
    • Q68B (Mitsubishi Electric) - Applied Automation - Extension rack ...
      ... PLCs (Programmable Logic Controllers) > MELSEC-Q (QnU) series > Racks / backplanes; Q68B. Mitsubishi Electric. Q68B. Extension...
      shop.appliedindustrialautomation.com
    • mitsubishi electric q68b plcs/machine control used - iGAM
      $50.00. 1 in stock. BRAND: MITSUBISHI ELECTRIC MODEL: Q68B CONDITION: used. SKU: IGAM0520095 Weight: 2 lbs. 1 in stock. MITSUBISHI...
      igam.com
    • Q68B - Mitsubishi Electric - Factory Automation Americas
      Please add this item to cart to request a quote or contact us at Mitsubishi-Electric@meau.com for product availability. Q68B. $717...
      MITSUBISHI ELECTRIC Global website
    • Q68B PLC Module/Rack by MITSUBISHI - Radwell International
      Q68B PLCs/Machine Control from MITSUBISHI In Stock, Order Now! Same Day Shipping, 2-Year Warranty - EXTENSION RACK, SERIES Q, 8 SL...
      Radwell International
    • Mitsubishi Q Series Motherboard Module Q68B, PLC, PAC and ...
      Mitsubishi Q Series Motherboard Module Q68B, PLC, PAC and Dedicated Controller * 1, 8, 32, 128, 16, 64, 256. I/O Number. ROM, Flas...
      Alibaba.com
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    Q68B - Programmable Logic Controllers & components


    MITSUBISHI ELECTRIC Global website
    https://shop1.us.mitsubishielectric.com › products › Q68B
    MITSUBISHI ELECTRIC Global website
    https://shop1.us.mitsubishielectric.com › products › Q68B
    Q68B Mitsubishi Electric - MELSEC-Q Series (QnU) Description: Extension rack / backplane unit - 8-slots - Mitsubishi Electric (MELSEC-Q QnU series)Read more
    Popular products
    • Q68B Mitsubishi | PLC Direct | Programmable Logic Controllers and Industrial Automation Products.
      Q68B Mitsubishi | PLC Direct | Programmable Logic Controllers and Industrial Automation Products
      $188.39
      PLC Direct
      Free delivery
      Q68B Mitsubishi | PLC Direct | Programmable Logic Controllers and Industrial Automation Products
      $188.39
      PLC Direct
      Free delivery
    • Mitsubishi Q68B.
      Mitsubishi Q68B
      $38.65
      PLC2day
      Mitsubishi Q68B
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    • Q68B Mitsubishi base unit new.
      Q68B Mitsubishi base unit new
      $125.00
      easycnc.net
      Q68B Mitsubishi base unit new
      $125.00
      easycnc.net
    • Mitsubishi Electric Q68B Plcs/Machine Control Used.
      Mitsubishi Electric Q68B Plcs/Machine Control Used
      $50.00Pre-owned
      iGAM Industrial Marketplace
      Mitsubishi Electric Q68B Plcs/Machine Control Used
      $50.00Pre-owned
      iGAM Industrial Marketplace
    • Mitsubishi Q68B Expansion Base Unit.
      Mitsubishi Q68B Expansion Base Unit
      $280.37
      components247.com
      Mitsubishi Q68B Expansion Base Unit
      $280.37
      components247.com
    • MITSUBISHI Q68B PROGRAMMABLE LOGIC CONTROLS USED.
      MITSUBISHI Q68B PROGRAMMABLE LOGIC CONTROLS USED
      $20.00Pre-owned
      iGAM Industrial Marketplace
      MITSUBISHI Q68B PROGRAMMABLE LOGIC CONTROLS USED
      $20.00Pre-owned
      iGAM Industrial Marketplace
    • MITSUBISHI Q68B-C PLC RACK.
      MITSUBISHI Q68B-C PLC RACK
      $403.70
      Radwell.com
      MITSUBISHI Q68B-C PLC RACK
      $403.70
      Radwell.com
    • Mitsubishi Plc - Q68DAV.
      Mitsubishi Plc - Q68DAV
      $797.00
      nexinstrument.com
      Mitsubishi Plc - Q68DAV
      $797.00
      nexinstrument.com

    New In Box MITSUBISHI Q68B PLC Module


    eBay
    https://www.ebay.com › ... › PLCs & HMIs › PLC Cables
    eBay
    https://www.ebay.com › ... › PLCs & HMIs › PLC Cables
    MITSUBISHI Q68B. PLC Module. New In Box. We believe ourWide Product Range will be your selection. Professional advise and any technical problem will be ...
    $112.97

    Wholesale plc pac and dedicated controllers Q68B, High Quality plc ...


    henengindustry.com
    https://www.henengindustry.com › plc-pac-and-dedicate...
    henengindustry.com
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    Wholesale our plc pac and dedicated controllers Q68B with factory price. we are leading plc pac and dedicated controllers Q68B supplier in China, ...

    PLC Controller Q68B PLC Module New Original Stock in ...


    Alibaba.com
    https://www.alibaba.com › product-detail › PLC-Contro...
    Alibaba.com
    https://www.alibaba.com › product-detail › PLC-Contro...
    Key attributes ; 90.5%On-time delivery rate ; US$ 170,000+Online revenue i ; ≤3hResponse time ; 2015Year founded ; 200Collaborating factories.Read more
    3.8(29)

    Mitsubishi Q68B PLCs


    Motion World
    https://www.motionworld.com › products › mitsubishi-...
    Motion World
    https://www.motionworld.com › products › mitsubishi-...
    Effective Sept 11th, 2025 Mitsubishi has added a 9.75% surcharge to this product. The surcharge will appear as a separate line item on each sales order.Read more
    $717.00 · Free delivery over $1,000

    1PCS New In Box MITSUBISHI Q68B for PLC Module Fast ...


    eBay
    https://www.ebay.com › ... › PLC Processors
    eBay
    https://www.ebay.com › ... › PLC Processors
    Our product categories range from well-known brands PLC to industrial control accessories. We sell Schneider, Allen-Bradley, Mitsubishi, Keyence and Omron. We ...Read more
    $113.40

    QA65B/QA68B Extension Base Unit User's Manual


    MITSUBISHI ELECTRIC Global website
    https://www.mitsubishielectric.com › manual › plc
    MITSUBISHI ELECTRIC Global website
    https://www.mitsubishielectric.com › manual › plc
    PDF
    This User's Manual describes the specifications, configuration devices, names and settings of each part, and mounting and installation of the. QA65B extension ...Read more
    20 pages

    mitsubishi electric q68b plcs/machine control used - iGAM


    igam.com
    https://igam.com › Industrial Electronics › PLC Chassis
    igam.com
    https://igam.com › Industrial Electronics › PLC Chassis
    MITSUBISHI ELECTRIC Q68B PLCS/MACHINE CONTROL USED. $50.00. Availability: 1 in stock. BRAND: MITSUBISHI ELECTRIC MODEL: Q68B CONDITION: used.Read more
    $50.00 · 30-day returns
    Missing: dedicated ‎| Show results with: dedicated

    Q68B 129578 | Mitsubishi Electric Authorized Distributor UAE


    DahebTech
    https://dahebtech.com › programmable-controllers-melsec
    DahebTech
    https://dahebtech.com › programmable-controllers-melsec
    Q68B (Material No: 129578), PLC Q Series Extension unit power supply + 8 I/O slots ,Fast delivery, genuine products, and technical support.
    Missing: pac ‎| Show results with: pac

    Q68B PLC Substrate for Dedicated Controllers


    Alibaba.com
    https://www.alibaba.com › product-detail › Q68B-PLC-...
    Alibaba.com
    https://www.alibaba.com › product-detail › Q68B-PLC-...
    Application:Automation Industrial;Condition:100%new 100%Original;Product name:Q68B;Warranty:1 Year;MOQ:1 Piece;Delivery time:1-3 Working Days ...

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