A soliton cellular automaton associated with crystals of symmetric tensor r
epresentations of the quantum affine algebra U-q'(A(M)((1))) is introduced.
It is a crystal theoretic formulation of the generalized box-ball system i
n which capacities of boxes and carriers are arbitrary and inhomogeneous. S
cattering matrices of two solitons coincide with the combinatorial R matric
es of U-q'(A(M-1)((1))). A piecewise linear evolution equation of the autom
aton is identified with an ultradiscrete limit of the nonautonomous discret
e Kadomtsev-Petviashivili equation. A class of N soliton solutions is obtai
ned through the ultradiscretization of soliton solutions of the latter. (C)
2001 American Institute of Physics.