Adding a robot to a line that is already producing parts is very different from commissioning a brand-new cell from scratch. Deadlines are tighter, planned downtime windows are scarce, and any planning mistake is paid for in lost output. This guide walks through the key phases to get the project right first time.
Why integrating into an existing line is more demanding
On a greenfield line, the integrator arrives at an empty space with full freedom over layout, cabling and safety architecture. On a brownfield line, all of that is already in place: machines are running, operators are moving around, a master PLC has its own logic, and production cycles cannot be broken. Integration means fitting the robot into that ecosystem without disrupting what already works.
Responsibility is another critical factor. Modifying an existing line may invalidate the original risk assessment. In most cases, a revised assessment and — where the modification is substantial — a new declaration of conformity for the modified assembly are legally required. This is not paperwork for its own sake; it is what prevents accidents and legal exposure.
Phase 1: Feasibility study and technical survey
Before buying a robot or booking a shutdown, you need to understand the line as it stands today. The survey must cover:
- Layout and available space: Is there room for the robot, its guarding and end-of-arm tooling? How does it affect operator and forklift movement?
- Line cycle time: How many seconds does the bottleneck station take? The robot must fit inside that cycle, not the other way around.
- Electrical and pneumatic supply: Is there spare capacity in the nearest panel? What air pressure and flow rate are needed?
- Interface with the master PLC: Which fieldbus or industrial Ethernet protocol does the line use? The robot controller must speak the same language.
- Existing safety signals: Emergency stops, interlocked guarding, light curtains. The robot joins the existing safety circuit rather than creating a parallel one.
A poor survey is the number-one cause of cost overruns in integration projects. Spending one or two days on this phase saves weeks of rework later. Our consultancy and audit service can support you through this initial stage.
Phase 2: Cell design and safety architecture
With the survey data in hand, the cell is designed: robot position, type of guarding or collaborative layout, tooling, part entry and exit. On brownfield lines it is often more practical to design a compact, access-controlled cell rather than reconfigure the entire line flow to accommodate a collaborative robot — the latter can cost more than it saves.
The risk assessment must address all operating modes: automatic production, manual mode for programming and maintenance, and emergency situations. It must also cover risks arising from the coexistence of the new robot with the adjacent machines that were already there.
Phase 3: Preparation in parallel with production
This phase is what separates a well-executed project from a rushed one. The goal is to complete as much work as possible without stopping the line:
- Build the robot's electrical panel and route cables to the connection point — but do not connect yet.
- Install guarding and the robot base during night shifts or planned weekend stoppages.
- Program and simulate the robot cycle offline, using simulation software or a test fixture with real parts.
- Develop the modified PLC program in a test environment so that the cutover is just a load-and-validate operation.
The more work is done in advance, the shorter the cutover window needs to be.
Phase 4: Cutover and commissioning
The cutover is the moment when the robot is connected to the line and the modified PLC program goes live. It must happen during the planned downtime window, with all involved technicians on site and a clear rollback plan in case something does not work and you need to revert to the previous state.
Commissioning always starts in manual mode at reduced speed. Every PLC signal is validated one by one, all safety interlocks are tested, and the full cycle is run dozens of times before switching to automatic mode. There are no shortcuts here.
ABB, KUKA and FANUC each have their own commissioning procedures and controller-specific requirements. Our robotic integration service covers all three brands across Spain, Portugal, France and Morocco.
Phase 5: Validation, documentation and training
- Validate actual cycle time against the theoretical target and fine-tune as needed.
- Update electrical drawings, layout diagrams and safety documentation.
- Train operators and the maintenance team: how to stop the robot safely, how to recover from a basic alarm, and what must never be touched.
- Add the new cell to the plant's preventive maintenance schedule from day one.
Training is especially important when the plant team has no prior experience with robots. An operator who understands what the robot is doing is far more valuable than one who only knows which button to press. For recommended maintenance intervals, see our article on how often industrial robot maintenance should be carried out.
Common mistakes that push costs up
- Not involving the safety and quality teams from the outset.
- Underestimating PLC integration time, particularly when existing documentation is out of date.
- Choosing the robot on price without verifying that its reach and payload fit the actual cycle.
- Failing to include the new cell in the overall plant maintenance plan.
With the right approach, integrating a new robot without disrupting quarterly production targets is entirely achievable. The key is thorough planning before a single bolt is tightened.