Determines how the plot changes if one or more X values are not within the limits shown on the X axis. For details, see Vary Axis Limits Automatically (директория R2013a>SimEvents>Simulation>Visualize Results>Choose and Configure Plotting Blocks).
Варианты If X value is beyond limit:

Initial Y axis lower limit, Initial Y axis upper limit
The interval shown on the Y axis at the beginning of the simulation. The interval might change from this initial setting due to zooming, autoscaling, or the If Y value is beyond limit setting.