接続元のポートハンドルから調べるしかないかと思います。
Ph = get_param(Output_block_name, 'PortHandles');
line_handle = get_param(Ph.Inport(1), 'Line');
outport_handle = get_param(line_handle, 'SrcPortHandle');
name = get_param(outport_handle, 'PropagatedSignals');
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!