Part 83, Figure 15 presents an example modular system with a head end and two IO modules. This simplistic example only represents how to model this particular collection of devices (i.e., a head end and two IO modules). For the C2D release of Part 83 we should extrapolate and provide an example that better represents how vendors will model their modular IO system. At a minimum the example should include many possible IO modules. Other considerations are variable sizes, multiple possible chasses, multiple possible head ends, other types of modules (e.g., power supplies), etc.