What are tags in a PLC context?

In the context of a Programmable Logic Controller (PLC), tags serve as text-based names assigned to specific memory locations within the PLC. This naming convention allows operators and programmers to easily identify and refer to various data points throughout the PLC program. Instead of using numerical addresses, which can be confusing and cumbersome, tags provide a more manageable way to represent inputs, outputs, and internal data that the PLC processes.

Using descriptive names enhances readability and understanding of the program, making it easier for individuals who may be troubleshooting or modifying the system to grasp the functionality and purpose of each memory location quickly. Tags also simplify the programming process, enabling the programmer to create more intuitive and organized code.

This concept contrasts with other options that do not accurately reflect the function of tags within a PLC environment. Numerical identifiers might refer to specific data but lack the clarity provided by text-based names. Graphical representations typically describe visual tools or interface elements, which are unrelated to the naming of memory locations. Physical connectors are components of the hardware that facilitate communication with various devices but do not pertain to the naming of data storage points.