In any robotic integration project there’s a decisive stage: commissioning. It’s the phase where the program is tested, adjusted and validated before the line goes into real production. For decades, that phase meant one thing: sending the engineering team to the plant and waiting there until everything worked. Today there’s an alternative that completely changes the time and cost equation, virtual commissioning. In this article we compare both approaches and explain why more and more integrators and manufacturers are bringing the virtual model into their projects.
What is on-site commissioning and what is virtual commissioning
On-site commissioning is the traditional method. The robot programming and PLC programming team travels to the customer’s facility, connects the software to the real hardware (robots, PLCs, sensors) and adjusts the program directly on the physical line. Any error is detected and fixed on site, with the line stopped or running at reduced speed while the process lasts.
Virtual commissioning reverses that order. Before the hardware reaches the plant, or even while it’s still being manufactured, the program is tested on a digital twin that simulates the real behavior of the robotic cell. Tools like Siemens Process Simulate let you validate trajectories, cycle times and possible collisions in a virtual environment identical to the physical one. By the time the hardware finally arrives at the plant, the program has already been debugged and only needs fine tuning.
The hidden cost of on-site commissioning
Travel and logistics
Every plant visit means flights, hotels, per diems and, on international projects, visas and time zone adjustment. That cost doesn’t show up in the engineering budget, but it comes out of the same pocket. And it isn’t a one-time cost: complex projects usually require several visits, not just one.
Production stopped while the program is adjusted
While the team tests and fixes the program on the real line, that line isn’t producing. In facilities where every hour of downtime has a direct cost on revenue, this turns commissioning into one of the most expensive stretches of the whole project, not because of engineering hours, but because of the plant’s lost output.
Unexpected delays outside the team’s control
A permit that takes too long, a restricted access, a line occupied by another project. In on-site commissioning, the pace of the work depends on factors the engineering team doesn’t control. A delay at the plant automatically becomes a delay for the whole project.
How virtual commissioning changes the picture
Time: the team works in parallel, not in sequence
An engineer can only be physically in one plant at a time. Working remotely, that same team can move forward on several lines, even several plants, at the same time. This doesn’t just shorten the individual project, it also lets you scale commissioning capacity without scaling the traveling headcount.
Cost: the budget stays in engineering
By removing travel, the budget that used to go to trips is redirected straight into programming and validation hours. It’s simply more engineering for the same money.
Quality: errors are caught before the hardware is installed
Perhaps the least visible benefit, but the most important one: programming errors are found and fixed in the virtual environment, before the robot is installed. This drastically reduces the risk that a design error forces a change to hardware that’s already mounted, something far more expensive to fix on the plant floor than in a simulation.
Does this mean on-site commissioning disappears?
No. Virtual commissioning doesn’t replace physical work entirely, it reduces it to what’s strictly necessary. There will always be a final validation phase on site: checking that the digital twin matches reality, adjusting mechanical tolerances and confirming system safety under real conditions. The difference is that this phase goes from weeks of trial and error to days of verification on a program that already works.
How we apply this at RBX Programming
At RBX Programming we put virtual commissioning at the center of our robotic integration projects, both in the United States and in Europe. We’ve applied it on projects with clients like Meltec Industrieofenbau and on programs for a pioneering electric vehicle manufacturer, where the number of lines and the tight deadlines made it unworkable to rely on on-site commissioning alone. In both cases, the goal was the same: let the engineering team move forward without waiting for the plant to be ready to receive them.
Key takeaways
- On-site commissioning involves flights, hotels and per diems that don’t show up in the engineering budget.
- Every hour of production downtime during program adjustment has a direct cost on revenue.
- Virtual commissioning lets you validate the program on a digital twin before the hardware reaches the plant.
- The same engineering team can commission several lines or plants in parallel while working remotely.
- On-site commissioning doesn’t disappear, but it shrinks to a final verification phase measured in days, not weeks.
Frequently asked questions
What is virtual commissioning?
It’s the process of programming, testing and validating the program for a robot or a robotic cell on a digital twin, before the physical hardware is installed on the plant floor.
How much time can you save with virtual commissioning?
The savings depend on each project, but most of it comes from moving the trial-and-error phase from the physical environment to the virtual one, leaving only a final verification on site instead of a full development from scratch.
Does virtual commissioning fully replace on-site commissioning?
No. A final on-site validation is always needed to confirm that the digital twin matches the real installation and to complete safety testing.
What tools are used for virtual commissioning?
Simulation software like Siemens Process Simulate, which reproduces the physical behavior of robots, PLCs and sensors in a virtual environment equivalent to the real one.
Is virtual commissioning viable for any type of project?
It’s especially useful for projects with multiple lines, tight deadlines or plants located far from the engineering team, where travel costs and production downtime have the biggest impact.
Conclusion
On-site commissioning and virtual commissioning aren’t competing to be the one correct method. They’re competing for how much time and budget your project has left. The sooner errors get resolved, the further from the critical schedule, the cheaper they are to fix. If your next robotic integration project still depends entirely on on-site commissioning, it’s a good time to ask how much of that work could be moved forward into a virtual environment, before the plant’s clock starts running.