What type of tag may contain integer values ranging from -2,147,483,648 to +2,147,483,647?

The type of tag that may contain integer values ranging from -2,147,483,648 to +2,147,483,647 is the DINT (Double Integer) tag. This range is characteristic of a 32-bit signed integer, which is what a DINT represents in programmable controller systems.

DINTs are used for storing whole numbers that require more range than can be provided by smaller integer types. The vast range of values allows for flexibility in applications such as controlling large systems, count variables, or any situation where numerical operations are performed on substantial data sets.

In contrast, BOOL tags are for boolean values, which only hold true or false states. REAL tags are used for floating-point numbers, which represent decimal values and cover a significantly different numeric range. STRING tags store sequences of characters, which are not applicable for integer values. Thus, the DINT tag is specifically designed to accommodate the full integer range mentioned in the question.