A module is described which is slidably attachable to a controller. Resource wires are connected to the module through resource connectors, The module has a circuit board that can perform actions. The module can modify the function of its resource connectors. These modifications may be to meet the requirements of resources that are to be connected to the module. The module may be able to monitor voltage, current, or power, or check for faults on the wire. The results of such monitoring may be displayed on a screen associated with the controller.