VR and Machine Safety: Practising LOTO Without Stopping the Line

The most dangerous moment is when the machine looks off

Maintenance, cleaning and clearing a jam are among the most critical phases of working with equipment. This is when a machine that appears to be stopped can start up again through an accidental restart or the release of stored energy (electrical, pneumatic, hydraulic, mechanical, thermal). The answer to this hazard has a precise name: LOTO, lockout/tagout, the control of hazardous energy through physically locking and tagging the controls.

In Italy the duty to work safely on equipment stems from Title III of Legislative Decree 81/08 on work equipment: Article 71 requires machines to be used and maintained safely, with interventions carried out on stopped parts and with the energy isolated. Internationally, the best-known reference is the OSHA 1910.147 standard (The Control of Hazardous Energy), which codified the lockout/tagout logic.

Why the procedure on paper is not enough

The LOTO sequence is easy to list but hard to execute under pressure: identify every energy source, shut down, isolate, apply the locking devices, dissipate stored energy, and verify the absence of voltage or pressure before working. The problem is that in the classroom these steps remain words. The operator memorises an order but never lives the consequence of skipping one.

This is where virtual reality changes the rules. A VR simulator rebuilds the real machine and its energy sources and asks the person to perform the procedure step by step. If they forget to release the stored energy of a hydraulic accumulator, the simulation shows it: the machine reacts, not a trainer correcting by voice.

What research says about immersive training

According to EU-OSHA and the literature on immersive learning, experiential VR-based methods increase knowledge retention and the ability to apply it in practice, because they actively engage the learner rather than just transmitting information. Field analyses of VR LOTO training highlight three concrete advantages:

• Repeated practice with no downtime: the operator repeats the sequence on a virtual machine identical to their own, without halting production or facing real energy.
• Consequence-free mistakes: getting it wrong in VR is a learning opportunity, not an injury.
• Objective metrics: many platforms record times, errors and skipped steps, data that also help document training during an inspection.

How to structure a VR LOTO path

A good path does not end in the headset. It works when it alternates three moments. First a knowledge phase: the machine's energy sources, the locking devices, the meaning of the tags. Then the immersive phase, in which the person performs the full procedure in VR, repeating it until the sequence becomes automatic. Finally the debrief, where the errors logged by the system are reviewed together and the experience is connected to the company's real procedures.

It is the same principle that makes VR effective in other high-risk areas, such as confined space training or forklift driving: you rehearse the action in a safe environment until it becomes body memory.

From simulation to everyday culture

Technology alone does not create safety. LOTO truly becomes a habit when the simulation is integrated with the risk assessment of the specific machine and with daily shop-floor conversations such as the toolbox talk. VR provides the gym; company culture decides whether that gym translates into consistent behaviour.

The advantage of virtual reality is that it lets you fail a thousand times without paying a price, so that on the real day the sequence is already written in your hands. Because with hazardous energy there is no second attempt: you know the procedure beforehand, or you learn it too late.

Sources: Legislative Decree 81/08 Title III, Art. 71; OSHA 1910.147 – The Control of Hazardous Energy; EU-OSHA, materials on immersive learning and virtual reality.