Which statement is true regarding global I/O tags?

Global I/O tags are designed to be accessible from multiple locations within a PLC program or across different programs. This allows for greater flexibility and modularity when building complex control systems. The ability to utilize these tags across different programs means that the same tag can represent a sensor or actuator used in various parts of a control system, promoting code reusability and configuration ease.

In contrast, some other types of tags may be limited to specific routines or programs, reinforcing the significance of global I/O tags. The capacity to change or modify these tags when needed is also a fundamental aspect, allowing for adaptation to evolving system requirements. Lastly, while global I/O tags can be associated with various data types, including analog signals, limiting them to digital inputs and outputs would restrict their functionality in more advanced applications.