Michelin Internal ControlLogix Practice Test

Data is accessed in the Logix5550 using tags—named data items stored in the controller’s memory. Programs read and write values by referring to these tag names, not by direct memory addresses. Tags can represent inputs, outputs, internal memory, or data shared across programs and can have different scopes and data types. This tag-based approach makes wiring, debugging, and integration with HMI/SCADA straightforward, and it’s why tags are the standard way to access data in Logix controllers.