  We perform simulations of planar arrays of superheated superconducting
granules (PASS) under an external magnetic field, analyzing transitions
undergone by the system when the external field is slowly increased from zero.
We observe, for high concentrations, the existence of an interval of external
fields for which no transitions are induced. This effect is analogous to a "hot
border zone" identified in the response of Superheated Superconducting Granule
detectors. We explain such behaviour as produced by a geometrical ordering
dynamically induced in the system by transitions in preferential sites due to
diamagnetic interactions.
