How are module-defined tags identified in PLC programming?

Module-defined tags in PLC programming are identified by their location, slot, and data type. This means that each module within the PLC has a specific location or slot in which it is installed, and when defining tags, the programmer needs to ensure they accurately reference this position. Additionally, the data type is crucial because it dictates how the data will be interpreted and used within the PLC system. Combining these three elements allows for the precise identification and utilization of the tags associated with each module, facilitating effective control and monitoring within the program.

The other identification methods, such as numerical address alone, programming sequence, or operational function, do not provide the same level of specificity and clarity needed for module-defined tagging. Numerical addresses may be part of the identification process, but they are not sufficiently descriptive without considering the physical position and data categorization of the module. Similarly, programming sequence and operational function are more about the logic and behavior of the system rather than the specific identification of tags within the framework of the PLC’s architecture.