Specify the name of the placement group of a block
void ssSetPlacementGroup(SimStruct *S, const char_T *groupName)
Use this macro to specify the name of the placement group to which the block represented by S belongs. S-functions that share the same placement group name are placed adjacent to each other in the block sorted order list for the model. There is no correlation between different placement groups. This macro should be invoked in mdlInitializeSizes.