A method to build, manage and analyze a gap analysis model in software of safety instrumented system architecture for a safety instrumented systems in a facility. These are suitable for stimulating chondrogenesis andor producing cartilage regeneration. The generator includes a power supply terminal, a grounding terminal, and an internal output terminal. Advantageously, the auxiliary tray can have substantially the same structure as the first carrier unit, except it has no beverage-receiving holes.