Abstract: A programmable logic controller or programmable automation controller assembly that can be used in harsh environments. A plurality of user-configurable housings are used to accommodate a customer's desired functionality design. A two-board design is featured to enable electronics in the controller assembly. The two-board design includes an active board that houses a majority of electrical components in the controller assembly, and a wiring hub that is used for wiring terminations. A mechanism is provided for a field-removable labeling system that withstands harsh environmental conditions.