XPM models have removable input and output terminal blocks. On XPM09090 and XPM04060 models, all of the input terminal blocks are located on the bottom of the controller, and the output terminal blocks are located on the top of the expansion module. The XPM18000 has inputs only which are located on both the top and bottom of the expansion module. For information about removing a terminal block, see Removing a terminal block. For more information about I/O terminal functions, requirements, and ratings, see Terminal wiring guidelines, functions, ratings, and requirements.