Industrial cobot integration for legacy assembly lines

Integrating collaborative robots (cobots) into legacy assembly lines allows manufacturers to upgrade productivity and ease labor shortages without doing a costly, full-scale line redesign.universal-robots.com+1

The primary industrial automation companies and equipment manufacturers providing hardware, software platforms, or certified integration networks specialized in legacy line retrofits include:

• Universal Robots (UR) : The market share leader in collaborative robotics, UR relies on a massive global network of Certified System Integrators (such as Cross Company and AtomTech ) that specialize in retrofitting UR cobots (like the e-Series and UR20/UR30) into existing, tight footprint legacy environments and older PLC control architectures.atomtechinc.com+2
• FANUC : Offers the CRX series of collaborative robots (including food-grade and heavy-payload variants) backed by pre-engineered deployment programs like Cobot and Go , which are specifically structured for fast, non-disruptive assembly integration such as screwdriving and component insertion. They also provide mobile cobot integration modules that bridge older workstations without changing physical line layouts.crx.fanucamerica.com+1
• ABB : Known for their GoFa and SWIFTI cobot lines, ABB provides safety-certified collaborative arms equipped with comprehensive software tools that easily interface with legacy automation equipment, allowing manufacturers to drop cells safely next to human workers on older lines.workplacenh.com
• KUKA : Provides lightweight collaborative robots (such as the LBR iiwa or LBR iisy) designed with sensitive collision detection, making them ideal for restricted legacy spaces where fences or major spatial reconfiguration are structurally impossible.
• Vention : Offers a platform-agnostic, digital engineering and hardware automation platform where manufacturers can design, order, and assemble custom cobot workstations (compatible with Universal Robots, FANUC, etc.) tailored to map directly onto distinct, irregular legacy factory floors.workplacenh.com
• Legacy Industries : A specialized systems integration provider that works directly with multi-brand industrial robot infrastructure (Fanuc, ABB, Yaskawa, Kuka) to custom-build fastening, welding, and vision-guided cells meant to merge smoothly with pre-existing plant processes.legacy-ind.com

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

• What specific assembly task you are looking to automate (e.g., screwdriving, testing, pick-and-place)
• What kind of legacy control system or PLC is currently on the line

I can help identify which approach or ecosystem fits best.

The strongest candidates are usually industrial automation system integrators rather than cobot manufacturers alone. They can add collaborative robots (cobots) to existing assembly lines while retaining legacy PLCs, conveyors, fixtures, sensors, and production equipment.

Based on the companies' published capabilities, I'd start with the following shortlist, particularly for North American manufacturing operations. Universal Robots documents successful automation of older machinery, while ONExia explicitly offers turnkey cobot integration into existing production lines.www.universal-robots.com+2

1. Companies to shortlist

Organized by integration role and fit for existing assembly lines.

• 

1. ONExia / Doosan Robotics Americas

(Strong turnkey option)

Designs, builds, and tests robotic cells, including vision systems, end-of-arm tooling, software, and safety integration. Its published offering specifically includes adding cobots to existing production lines.

Best for: assembly, machine tending, packaging, and incremental automation.

Cobot integration services ·www.universal-robots.com+2

---

• 

2. CONVERGIX Automation Solutions

A candidate for complex, multi-vendor automation projects where new robotics must work alongside existing controls and equipment.

Best for: brownfield modernization, multi-station assembly, and mixed automation platforms.

Company website ·

---

• 

3. Universal Robots (UR) and its integration partners

UR's open integration ecosystem is useful for automating older machines that lack conventional robot interfaces. One documented deployment automated six operations on legacy machinery at All Axis Machining.

Best for: incremental upgrades, screwdriving, inspection, machine tending, and smaller assembly workstations.

Read the legacy-machine case study ·www.universal-robots.com+1

---

• 

4. FANUC America and authorized integrators

A logical choice for plants already using FANUC robots or CNC equipment. Its authorized integrator network includes firms providing assembly, machine-tending, and other automation applications.

Best for: established automotive, metalworking, and general manufacturing operations.

Find a FANUC authorized integrator ·www.fanucamerica.com+1

---

• 

5. DMC, Inc.

Offers robotic engineering and PLC integration, with cross-vendor experience supporting new deployments and upgrades in existing manufacturing environments.

Best for: projects where controls engineering and compatibility with existing equipment are major requirements.

Robotics engineering capabilities ·www.dmcinfo.com

---

• 

6. Remtec Automation

Develops robotic assembly systems and describes integrating new robotics with existing processes and legacy equipment under a coordinated control system.

Best for: fastening, joining, part feeding, inspection, and multi-operation assembly cells.

Robotic assembly services ·www.remtecautomation.com

2. Additional companies worth evaluating

These are additional candidates, not a ranking of verified project outcomes. Confirm each company's experience with your specific type of legacy line before requesting a proposal.

3. Which cobot manufacturers should you consider?

The robot OEM and the company responsible for integrating it are often different.

• 

ABB Robotics

Consider for precision assembly, electronics, inspection, and broader factory automation.

ABB Robotics

• 

KUKA

Consider for automotive and precision manufacturing environments where collaborative and conventional robots must coexist.

KUKA

• 

Yaskawa Motoman

Consider for assembly, handling, and machine loading, especially when Yaskawa equipment is already installed.

Yaskawa Motoman

4. How to select the right integration partner

Before choosing a vendor, verify that it can:

• Interface with your existing PLCs — including Allen-Bradley, Siemens, Mitsubishi, or other installed controls.
• Preserve the existing line — minimize mechanical changes, downtime, and production disruption.
• Engineer safety properly — assess collaborative operation, safeguarding, stopping distances, and the complete cell's risk.
• Handle tooling and sensing — including grippers, vision, part fixtures, and quality inspection.
• Support commissioning and maintenance — provide documentation, training, spare parts, and ongoing troubleshooting.

A cobot is not automatically safe to operate beside a person simply because it is collaborative; the complete application needs an appropriate safety assessment.

My recommendation

For a retrofit project, I'd initially contact ONExia, CONVERGIX, and one integrator familiar with your existing controls platform. Add Universal Robots or FANUC as the robot-platform candidates, depending on the machinery already installed and the task to automate.

One question would help me narrow this down substantially: What industry and type of assembly line are you working with? For example, automotive components, electronics, medical devices, packaging, or general manufacturing.

Yes. The companies you're looking for are generally called robotic system integrators or industrial automation retrofit specialists. They engineer and install collaborative robots (cobots) into older assembly lines while preserving as much of the existing equipment as possible.

The work often includes connecting cobots to legacy PLCs and conveyors, adding grippers and vision systems, integrating safety controls, and commissioning the updated line without a complete rebuild.www.pattiengineering.com+2

Here is a shortlist of companies worth evaluating, focusing on providers that serve U.S. manufacturers.

1. Companies to contact first

• 

1. ONExia — turnkey cobot integration

(Strong starting point)

Designs, builds, and tests custom robotic cells, including collaborative robots, machine safety, end-of-arm tooling, vision systems, and software integration. A good candidate when an existing workstation needs a purpose-built robotic addition.

Location: Pennsylvania; serves the U.S. and Canada.

Website and integration services

onexia.comonexia.com

---

• 

2. Patti Engineering — controls and factory integration

Integrates FANUC collaborative robots into manufacturing processes, with experience across assembly, machine tending, inspection, and packaging. Particularly relevant if your older line uses PLCs and established factory control systems.

U.S. industrial automation engineering firm.

Collaborative robot integration

www.pattiengineering.comomnatec.comwww.remtecautomation.com

---

• 

3. CONVERGIX Automation Solutions — broader line modernization

Worth evaluating for projects that involve more than adding a single robot, such as coordinating robotic stations, existing equipment, controls, and production processes.

Best candidate to assess for larger, multi-system integration projects; confirm the specific cobot platform and retrofit scope.

Company website

parse.gl

---

• 

4. ECON Tech — cobots plus existing plant systems

Offers integration of Universal Robots cobots, machine vision, material handling, and MiR autonomous mobile robots. A useful option for manufacturers looking to automate selected tasks without replacing the whole line.

Advanced robotics services

econ-tech.com

---

• 

5. Cobot Team — incremental automation

Provides robot selection, integration, training, and ongoing support. Works with FANUC and Dobot cobots and offers turnkey deployments or integration alongside the customer's engineering team.

Company website

www.pattiengineering.comomnatec.comwww.remtecautomation.comonexia.comonexia.comwww.cobotteam.com

2. Additional integrators for legacy production lines

These are particularly worth considering if the project involves older controls, existing machinery, or a larger assembly-line retrofit.

• 

6. Remtec Automation

One of the clearest matches for your requirement. Remtec explicitly discusses integrating new robotic systems with legacy equipment and combining both under integrated controls. Applications include assembly, inspection, dispensing, and machine tending.

Website — robotic integration ·www.remtecautomation.com+3

---

• 

7. Acieta

Provides custom robotic integration, feasibility testing, simulation, installation, and service. Its stated capabilities include integrating automation with existing production lines and machinery. A strong option for phased modernization.

Website ·acieta.com+1

---

• 

8. JR Automation

Handles complex robotic assembly and production automation, integrating different robot manufacturers alongside PLC, HMI, MES, and SCADA systems. Best suited to larger projects or multiple connected stations.

Website — robotics integration ·www.jrautomation.com

---

• 

9. Lion Inc.

Especially relevant when the existing line has obsolete PLCs, aging robot controllers, or outdated safety systems. Lion specializes in controls modernization and equipment retrofits, which can be essential before or during a cobot installation.

Website — retrofits and upgrades ·lioninc.us+1

3. Which companies should you prioritize?

These are preliminary matches based on their published capabilities, not verified quotations or guarantees that each company will accept your specific project. Also, some projects are better served by a conventional industrial robot than a cobot, depending on speed, payload, guarding, and risk assessment.

4. What to ask when requesting a quote

To distinguish a genuine retrofit integrator from a company that primarily sells robot arms, ask whether they will:

• Survey the existing line and document its interfaces before proposing equipment.
• Integrate with your current PLC, conveyor, sensors, tooling, and HMI.
• Design the required safety system and validate the completed installation.
• Install and commission the equipment during planned downtime.
• Provide operator training, maintenance, and ongoing support.
• Demonstrate a similar retrofit they have completed on an existing production line.

Let me narrow this down to the best vendors for you

One detail would help most: Where is the factory located? I can narrow the list to integrators that serve your area and are best suited to retrofitting older assembly equipment, rather than just selling cobots.