A terminal assembly module is provided that simplifies the transfer of I/O wiring from a pre-existing industrial controller to a replacement industrial controller. The terminal assembly module replaces an I/O module in the pre-existing industrial controller chassis. The I/O module terminal block, with I/O wiring maintained intact, is removed from the discarded I/O module and installed on the terminal assembly module. A multi-conductor cable is then plugged into a cable connector on the front of the terminal assembly module, which electrically connects the I/O module terminals to the conductors of the cable. The cable conductors can then be connected to the I/O modules of the new industrial controller. Thus, the terminal assembly module eliminates the need to disconnect the existing I/O wiring from the I/O module terminal blocks of the pre-existing industrial controller.