Which industrial automation companies integrate collaborative robots with legacy assembly lines?

Yes. If you mean companies that can actually retrofit cobots into existing/brownfield assembly lines, rather than simply sell a cobot, there are several notable options.

Cobot/automation OEMs

• Universal Robots (UR) — Particularly suited to incremental retrofits. UR documents deployments where cobots were connected to legacy machinery that lacked a direct robot interface, using its open integration ecosystem.
• FANUC — Its CRX collaborative robots are used for assembly, fastening, inspection and machine tending. FANUC also has a large authorized-integrator ecosystem, making it practical for plants with existing FANUC controls and equipment. FANUC has also demonstrated CRX robots performing tasks on moving assembly lines with 3D vision.
• ABB Robotics — Offers collaborative robots alongside conventional industrial robots, vision, force control and factory-automation software. ABB specifically describes cobots being integrated into existing automotive workflows and lines.
• KUKA — Its collaborative platforms are used alongside conventional industrial automation, particularly in automotive and precision assembly.
• Yaskawa Motoman — Offers collaborative robots together with conventional robots, motion control and automation, making it suitable for hybrid modernization projects.
• OMRON — A useful option when the project involves not just the robot but also PLCs, sensing, machine vision and safety controls.

System integrators

For a legacy line, these companies can be more relevant than the robot manufacturer because they engineer the interfaces between the new cobot and the old equipment.

• Patti Engineering — A FANUC Authorized System Integrator with experience deploying cobot systems in automotive, pharmaceutical, food & beverage, semiconductor and aerospace manufacturing. Its work includes connecting cobots to existing plant control infrastructure.
• JR Automation — Large-scale automation integrator involved in robotic assembly and manufacturing-system integration, including automotive applications.
• CONVERGIX Automation Solutions — Relevant for multi-vendor brownfield modernization where the existing line may contain several generations or brands of controls and robots.
• ONExia — Provides turnkey robotic/cobot cells, including controls, tooling, vision and safety integration.
• ATS Corporation — Focuses on complex assembly and test automation, including vision-guided robotics and production-line systems.
• Silver Lake Automation — FANUC-oriented integration for assembly, machine tending, inspection and material handling.
• Cobot Team — Builds FANUC CRX and Dobot collaborative assembly systems, including force-controlled insertion, screwdriving and vision applications.

What "legacy integration" usually involves

A retrofit integrator typically has to connect the cobot to:

• Existing PLCs such as Siemens, Rockwell/Allen-Bradley, Mitsubishi or Omron
• Conveyor indexing and sensors
• Legacy machine I/O
• Existing fixtures and tooling
• Safety circuits, scanners and interlocks
• Vision/inspection equipment
• MES/SCADA systems

The objective is often adding one automated operation without replacing the entire line. For example, ABB describes solutions that can integrate into existing automotive lines, while Universal Robots has documented cobots automating older equipment without a conventional robot interface.

A useful distinction: UR, FANUC, ABB, KUKA and Yaskawa are primarily robot/automation OEMs; companies such as Patti Engineering, JR Automation and ONExia are closer to the "engineer and install the brownfield retrofit" role.

If you're evaluating vendors for an actual project, the existing PLC/controls brand, industry, cobot task, payload/reach, and age of the line are the key variables for narrowing this down.

Major industrial automation providers and specialized system integrators deploy collaborative robots (cobots) onto legacy assembly lines by retrofitting existing mechanical footprints, adding force-torque sensors, and integrating modern PLCs with older control architectures.

Because legacy lines lack native digital interfaces or safety enclosures suited for human-robot collaboration, integration requires specialized hardware adaptation and software bridging.

Key Automation OEMs & Equipment Providers

The primary manufacturers of collaborative robot hardware supply application-specific kits and software to ease deployment onto older, manual, or semi-automated lines:

• Universal Robots: Provides lightweight e-Series and heavy-duty cobots (like the UR10 and UR20) widely used by third-party integrators to retrofit tight manual assembly spaces for screwdriving, testing, and pick-and-place.
• ABB Robotics: Offers collaborative arms (such as YuMi and GoFa) coupled with SafeMove software, allowing older industrial environments to safely share workspace without redesigning the entire shop floor perimeter.
• KUKA Robotics: Supplies sensitive LBR iiwa cobots that feature integrated joint torque sensors, ideal for delicate legacy assembly tasks requiring human-like touch feedback.
• FANUC America: Delivers the CRX series of collaborative robots designed for plug-and-play operation with reliable payloads, frequently retrofitted into mature automotive and electronics lines.

Specialized System Integrators

Global and regional engineering firms handle the custom mechanical tooling, PLC translation (such as bridging Rockwell, Siemens, or Modbus protocols to older proprietary systems), and risk assessments required for legacy retrofits:

If you'd like to narrow this down, please share:

• The industry or specific assembly task (e.g., screwdriving, machine tending, inspection)
• The age or control brand of your legacy line (e.g., Allen-Bradley, Siemens, older relay logic)

I can provide a more tailored list of integrators or technical strategies for your project.

Yes. The strongest candidates fall into two groups: robot/automation OEMs that provide the cobot platform and controls, and systems integrators that actually retrofit the cobot into an existing line.

Strong candidates

If you're specifically looking for brownfield/legacy-line specialists

I'd prioritize CONVERGIX, ECON Tech, Flex-Line, ONExia, and FANUC-authorized integrators over simply approaching a cobot manufacturer.

The reason is that the difficult part usually isn't mounting the cobot. It's interfacing it with the old PLC, I/O, conveyors, sensors, safety circuits, fixtures, machine interfaces and vision systems without rebuilding the entire line. CONVERGIX, for example, combines cobot integration with Siemens PLC/controls capabilities, which is particularly relevant to brownfield work.

A particularly compelling example is Universal Robots' All Axis Machining deployment: the customer had legacy machines with no direct interface for traditional industrial robots, but used UR's open integration architecture to automate six operations.

If your target is U.S. companies that can physically retrofit an existing assembly line, rather than robot OEMs, I can narrow this to 10–15 systems integrators and rank them by industry, size, geography, robot brands supported, and brownfield experience.

Integrating collaborative robots (cobots) into legacy assembly lines requires retrofitting older machinery, bridging communication gaps with outdated PLCs (Programmable Logic Controllers), and configuring safety architectures without ripping out existing infrastructure.

Major industrial automation OEMs, specialized integrators, and certified partner networks handle these brownfield retrofits.

1. Major Robotic OEMs with Dedicated Retrofit & Integration Support

These companies manufacture the cobots and provide engineering services or certified integrator networks to merge them into older legacy footprints:

• •   - **ABB Robotics** — Offers cobots like the GoFa and SWIFTI alongside legacy-compatible software and field engineering to tie modern robotic safety systems into older brownfield factory setups.[](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach) [[1]](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach)
    

• •   - **FANUC America** — Provides a robust lineup of collaborative robots (like the CRX series) coupled with deep controls integration support to interface with legacy hardware and older generations of FANUC controllers.[](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach) [[1]](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach)
    

• •   - **KUKA AG** — Known for sensitive, precise cobots (such as the LBR iiwa), KUKA works through global system integration partners to retrofit older manual or hard-automated assembly stations.[](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach) [[1]](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach)
    

• •   - **Universal Robots (UR)** — As a pioneer in the cobot space, UR relies on an extensive global network of **Certified System Integrators (CSIs)** (such as AtomTech, Cobots Online , and Robotec ) specifically trained to mount, program, and tie cobots into existing, non-automated legacy lines.[](https://www.universal-robots.com/blog/keeping-it-in-the-family-our-latest-certified-systems-integrator-cobots-online/) [[1]](https://www.universal-robots.com/blog/keeping-it-in-the-family-our-latest-certified-systems-integrator-cobots-online/)[[2]](https://www.atomtechinc.com/media-center/atomtech-receives-universal-robots-system-integrator-certification)[[3]](https://www.robotec.bg/frequently-asked-questions-faqs/)
    

• •   - **Yaskawa Electric** — Manufactures the HC (Human Collaborative) series and provides application engineering to bridge modern end-effectors with older line controllers.[](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach) [[1]](https://www.eliterobots.com/blog/top-15-cobot-manufacturers-in-2026-ranked-by-integration-roi-and-global-reach)
    

2. Specialized System Integrators & Engineering Firms

Independent automation and controls integration firms specialize explicitly in brownfield updates—taking a legacy assembly line and weaving in collaborative technology:

• •   - **GAV Sistemi** — Analyzes existing workflows on mature production floors, helps choose hardware from tier-one brands (ABB, KUKA, Yaskawa), and executes the physical and electrical retrofitting required for Industry 4.0 upgrades.[](https://www.gavsistemi.com/examples-of-robots-automotive-collaborative-lines/) [[1]](https://www.gavsistemi.com/examples-of-robots-automotive-collaborative-lines/)
    

• •   - **JHFOSTER** — Focuses heavily on industrial automation and guiding manufacturers through risk assessment, safety-monitored stops, and physical integration of cobots into established, non-networked legacy spaces.[](https://jhfoster.com/automation-blogs/integrating-cobots-into-manufacturing/) [[1]](https://jhfoster.com/automation-blogs/integrating-cobots-into-manufacturing/)
    

• •   - **Legacy Industries** — Specializes in customized robotic system integration spanning major legacy-friendly platforms (Fanuc, ABB, Yaskawa, Kuka) to automate fastening, vision guidance, and assembly handling in older facilities.[](https://legacy-ind.com/automation-integration-3/) [[1]](https://legacy-ind.com/automation-integration-3/)
    

• •   - **OmnaTec** — Specializes in "retrofit automation", helping small-to-medium enterprises mount cobots directly adjacent to legacy CNCs, presses, and manual assembly cells without redesigning the core factory footprint.[](https://omnatec.com/knowledge-base/retrofitting-cobots-into-existing-production-lines-a-practical-guide-for-smes) [[1]](https://omnatec.com/knowledge-base/retrofitting-cobots-into-existing-production-lines-a-practical-guide-for-smes)
    

If you have a specific project in mind, let me know:

• What legacy machinery or task you are trying to automate (e.g., machine tending, screw-driving, inspection)
• The approximate age or brand of the PLC/controls on the line

I can help you outline a step-by-step retrofit strategy or identify the ideal integration approach.

Integrating collaborative robots (cobots) into legacy assembly lines requires bridging older proprietary hardware, mechanical constraints, and non-standard safety zones with modern plug-and-play robotics.

Several major industrial automation providers and specialized system integrators focus on retrofitting and deploying cobots into existing, older manufacturing footprints:

• Universal Robots (UR) / Ecosystem Integrators: Known as a pioneer in lightweight cobots, UR features the Universal Robots platform and partner network (such as regional integrators like Olympus Controls). Their hardware and SDK ecosystems are heavily utilized to tie cobots into older machinery and brownfield assembly floors without requiring a total line rip-out.
• KUKA: Offers scalable automation and mobile robotic systems designed explicitly to interface with legacy infrastructures. Their engineering approach focuses on brownfield integration where space constraints and older line layouts dictate flexible deployment.
• FANUC Certified Integrators: While FANUC builds traditional industrial units, their network of authorized system integrators (such as South Shore Controls) specialize in retrofitting older lines with modern collaborative or caged-to-collaborative transitional robots, ensuring backwards compatibility with legacy PLC logic.
• ONExia / Doosan Robotics Partners: Regional turnkey specialists like ONExia package Doosan cobots into custom, legacy-adapted machinery configurations, engineering specialized mounting and custom interfaces for older factory setups.
• GAV Sistemi: Specializes in complex automotive and industrial assembly line implementations. They evaluate existing workflow dynamics on older lines and handle multi-brand cobot integrations (featuring partners like ABB, KUKA, and Yaskawa) to ensure Industry 4.0 compatibility.

If you'd like to narrow this down, please tell me:

• What industry or specific application are you working with (e.g., automotive, electronics, metal machining)?
• Are your legacy machines controlled by older PLC models (like Allen-Bradley SLC 500 or Siemens S7-300)?

I can provide a more tailored integration approach or recommend a specific architectural strategy.

Companies that integrate collaborative robots (cobots) with legacy assembly lines are usually either (1) cobot/robot manufacturers with retrofit ecosystems or (2) industrial automation integrators that redesign the surrounding line, controls, safety, and tooling.

Major cobot and industrial robot manufacturers

Automation integrators that retrofit existing lines

These companies are often the ones that actually make a cobot work with an older conveyor, PLC, fixture, or machine:

• JR Automation — Large-scale automation integrator with experience integrating robots from FANUC, ABB, KUKA, Yaskawa, and others into production systems.
• ONExia — Provides turnkey robotic cells, cobot integration, safety systems, custom tooling, vision, conveyor integration, and upgrades to existing production equipment.
• CONVERGIX Automation Solutions — Works with multi-vendor manufacturing environments and integrates UR cobots, Yaskawa robots, Siemens controls, and other factory automation systems.
• ATS Corporation — Specializes in complex assembly automation, testing, and manufacturing systems.
• Flex-Line Automation — Focuses on assembly, material handling, conveyors, and robotic integration.
• Hirebotics — Universal Robots certified integrator focused on deployable cobot systems for manufacturing.

What these companies typically retrofit

A legacy-line cobot project often includes:

• PLC communication: EtherNet/IP, PROFINET, Modbus TCP, or older I/O bridging
• Safety upgrades: scanners, safety relays, interlocks, reduced-speed zones
• Machine vision: cameras to compensate for older fixtures or variable part placement
• End-of-arm tooling: custom grippers, screwdrivers, weld tools, inspection probes
• MES/traceability links: connecting older equipment to modern production tracking

Common shortlist by scenario

• Older CNC/machine shop equipment: Universal Robots + a UR integrator; FANUC CRX if the plant already uses FANUC.
• Automotive or heavy manufacturing: FANUC, ABB, KUKA, Yaskawa with a large integrator such as JR Automation.
• Small-to-medium manufacturer wanting a quick retrofit: Universal Robots ecosystem, ONExia, or Hirebotics.
• Complex brownfield plant with mixed vendors: CONVERGIX or a large systems integrator.

For a real retrofit evaluation, the key information is usually the existing PLC brand/age, conveyor controls, assembly task (screwing, inspection, pick-and-place, testing, etc.), and required cycle time—those factors often determine the integrator more than the cobot brand.

Integrating collaborative robots (cobots) into legacy assembly lines often requires bridging older, proprietary PLC (Programmable Logic Controller) architectures, mechanical setups, and non-networked machinery with modern, sensor-rich robotic arms.

Major industrial automation providers, specialized engineering firms, and certified system integrators handle this type of brownfield integration:

• Onexia: Specializes in custom robotic system integration, specifically focusing on retrofitting multi-axis robotic systems and flexible cobot cells into legacy machinery and diverse older manufacturing environments.
• Legacy Industries: Focuses on comprehensive automation and plant process optimization, specializing in tailoring robotic systems to upgrade manual or older, complex assembly lines.
• GAV Sistemi: Provides holistic workflow analysis and implementation, deploying cobots (partnering with brands like KUKA, ABB, and Yaskawa) into existing assembly environments to transition older floors into Industry 4.0-ready setups.
• Universal Robots (UR) Certified System Integrators (e.g., AtomTech, Cobots Online): While Universal Robots manufactures the hardware, their global network of Certified System Integrators (CSIs) specifically focuses on engineering the mechanical interfaces and communication protocols required to drop cobots safely into pre-existing legacy production lines.
• Global Industrial OEMs (FANUC, ABB, Yaskawa, KUKA): Major robot manufacturers offer dedicated industrial cobot lines (such as FANUC’s CRX series or ABB's SWIFTI/GoFa) equipped with legacy-compatible I/O modules, Ethernet/IP, and Profinet gateways, allowing their local integration partners to tie them into older factory networks. [1][2]

If you can share what kind of legacy equipment or PLCs you are working with (e.g., Allen-Bradley, Siemens S7-300) and the specific task (e.g., pick-and-place, machine tending), I can provide more details on the communication protocols or hardware needed.

Yes. If by “integrate” you mean retrofit cobots into an existing/brownfield assembly line without replacing the whole line, the strongest candidates fall into two groups: robot OEMs and system integrators.

Strong candidates

One particularly good example

Universal Robots + an integrator is probably the easiest starting point for a small or mid-sized legacy line. In one documented case, Hirebotics integrated a UR3 directly into an existing assembly line and handled programming, deployment and maintenance.

Another UR deployment at All Axis Machining is especially relevant to the “legacy” question: the shop had old machinery with no direct interface for traditional industrial robots, yet UR cobots were integrated through the machines' existing controllers and ultimately automated six operations.

How I'd shortlist them

• Small/medium retrofit: Universal Robots + certified integrator
• Existing FANUC equipment: FANUC + FANUC-authorized integrator
• Complex multi-vendor line: CONVERGIX or JR Automation
• Turnkey cobot cell: ONExia
• Conveyor-heavy assembly line: EWAB
• Precision/electronics assembly: ABB or Universal Robots
• Controls/PLC-heavy modernization: Omron, ABB, or a specialized systems integrator

The important distinction is that the cobot manufacturer isn't necessarily the company that performs the brownfield integration. The integrator has to connect the robot to the existing PLC, machine I/O, conveyors, safety circuits, sensors, vision and tooling. That's often more important than the choice of cobot itself.

If you're evaluating vendors commercially, I can also give you a ranked list of 10–15 U.S. integrators, including industries served, geographic coverage, robot brands supported, and evidence of actual legacy-line deployments.

Companies that integrate collaborative robots (cobots) into legacy assembly lines typically include both cobot manufacturers with integration ecosystems and industrial automation system integrators that retrofit older PLCs, conveyors, fixtures, safety systems, and machinery. The integrator is often the key partner because legacy modernization is usually a controls and mechanical-integration problem, not just a robot purchase.

Major cobot manufacturers with legacy-line integration capabilities

• universal-robots.com — Strong fit for brownfield upgrades involving assembly, screwdriving, inspection, machine tending, and pick-and-place. Its UR+ ecosystem provides certified grippers, vision systems, and integration components that help connect cobots to existing equipment. A documented deployment used UR cobots to automate older machinery that lacked direct robot interfaces.
• fanucamerica.com — The CR and CRX collaborative robot lines are commonly used where factories already have FANUC robots, CNC machines, or FANUC controls. FANUC’s integrator network is often used to connect cobots into existing production cells.
• new.abb.com — Offers collaborative robots such as YuMi, GoFa, and SWIFTI for precision assembly, electronics, inspection, and material handling. ABB’s automation software ecosystem is useful for plants that already use ABB controls and robotics.
• kuka.com — Often selected for automotive, aerospace, and precision assembly environments where collaborative robots must coexist with conventional industrial automation.
• motoman.com — Provides collaborative robots alongside traditional industrial robots, motion control, and factory automation systems, making it suitable for hybrid modernization projects.
• automation.omron.com — A strong option when the retrofit requires not only a cobot but also PLCs, sensors, machine vision, and safety integration.

System integrators that retrofit legacy assembly lines

These companies typically handle the difficult parts: PLC communication, mechanical adaptation, safety circuits, tooling, vision, and commissioning.

• onexia.com — Provides turnkey collaborative robot cells, including safety integration, grippers, vision systems, software, and upgrades to existing production equipment.
• convergixautomation.com — Works on multi-vendor automation environments and integrates technologies such as Universal Robots cobots, Yaskawa robots, and Siemens automation platforms.
• jrautomation.com — A large automation integrator focused on complex assembly systems, robotics, and manufacturing automation.
• atsautomation.com — Specializes in automated assembly, testing, and production-line upgrades for industries such as automotive, medical devices, and consumer products.
• flex-lineautomation.com — Focuses on assembly automation, conveyors, and robotic integration projects.

Typical legacy-line retrofit architecture

A successful cobot retrofit often includes:

1. PLC/controls interface

• Ethernet/IP, Profinet, Modbus TCP, or digital I/O connections between the cobot and older controllers.

2. Safety modernization

• Safety scanners, light curtains, safety PLCs, or upgraded interlocks so humans can work near the cobot.

3. Tooling upgrades

• Custom grippers, screwdrivers, dispensers, inspection tools, or end-of-arm tooling.

4. Vision integration

• Cameras and AI/vision systems compensate for older fixtures or inconsistent part positioning.

5. Minimal disruption installation

• Many cobot retrofits are designed as add-on cells rather than full line replacements.

Practical shortlist by situation

For a true legacy assembly-line modernization, the most important selection criteria are usually the integrator’s experience with your existing PLC brand, safety architecture, and process—not just the cobot brand.

Integrating collaborative robots (cobots) into legacy assembly lines requires bridging older mechanical infrastructure, non-standard PLCs, and fixed physical layouts with modern, force-sensitive, and vision-guided robotic systems.

The market is split between major automation OEMs (who manufacture the hardware and provide integration software) and specialized robotic system integrators (who handle the physical retrofitting on the factory floor).

1. Major Industrial Robotics OEMs (Hardware & Ecosystems)

These companies build the collaborative hardware and software frameworks used to retrofit legacy lines, often partnering with specialized local integrators:

• Universal Robots (UR): The market leader in cobots. UR pioneered the flexible, lightweight arm concept. Through ecosystems like UR+ and partnerships with AI vision companies (like Inbolt ), their cobots are frequently retrofitted onto older moving legacy assembly lines for tasks like screwdriving, gluing, and inspection.
• FANUC America: Offers a massive lineup of collaborative robots (from 3kg to 50kg payloads). FANUC specializes in retrofitting older production environments using their iRVision and force-sensing tech, allowing legacy lines to accept high-precision robotic assistance without tearing out old safety fencing.
• ABB Robotics: Offers the GoFa and SWIFTI collaborative series. ABB is well-known for helping transition traditional brownfield (legacy) factories into flexible automation cells by pairing cobots with older PLC architectures.
• KUKA Robotics: Their LBR iiwa sensitive, 7-axis cobots are engineered for delicate, human-like assembly tasks. KUKA integrators often deploy them directly into tight spaces on older, high-density legacy lines where traditional caged robots wouldn't fit.
• Doosan Robotics: Noted for high-sensitivity torque sensors and advanced hand-guiding programming, making it easier for line operators to retrain legacy-adjacent cobots on the fly without complex line reprogramming.

2. Specialized System Integrators (The Retrofit Specialists)

OEMs rarely sell directly to a legacy plant for a custom retrofit; instead, specialized regional and global engineering firms handle the mechanical adaptation, custom end-effectors (grippers), and PLC handshakes required for older hardware:

• Global/National Integrators (e.g., ATS Corporation, Apex Automation, Dynamic Group ): These firms specialize in "brownfield integration"—evaluating legacy assembly conveyors, older Allen-Bradley or Siemens S7-300/400 PLCs, and writing custom middleware so a new cobot can communicate safely with machinery built decades ago.
• Niche Automation Providers (e.g., GAV Sistemi, Legacy Industries ): They focus explicitly on merging modern Industry 4.0 sensor suites, safety scanners, and cobots into existing legacy footprints to maximize ROI without triggering a full assembly line redesign.

Key Challenges Addressed During Integration

When these companies retrofit a legacy line, they typically solve three main bottlenecks:

1. Safety & Space Constraints: Adding safety-rated laser scanners or using the cobot's native force-limiting features so fencing isn't required in cramped legacy plants.
2. Communication Protocols: Translating signals from modern ROS (Robot Operating System) or OPC-UA frameworks to older, legacy industrial fieldbuses (e.g., DeviceNet, Profibus).
3. Part Variation/Fiducial Tracking: Adding 3D vision systems (such as NVIDIA Jetson-powered edge AI packages) so the cobot can dynamically adjust to variations or shifting speeds on an older, non-synchronized conveyor belt.

If you are planning a specific retrofit project, tell me:

• What industry or specific task (e.g., machine tending, fastening, inspection) are you looking to automate?
• What generation of PLC or machinery is currently on the legacy line?

I can help outline a step-by-step integration strategy or suggest the right category of partner.