During data handling, which instruction is designed to clear contents from an array?

The CLR instruction is specifically designed to clear the contents of an array in Rockwell ControlLogix programming. This instruction effectively sets all elements of the targeted array to zero or their default data type values, facilitating proper initialization or resetting of array data.

Using the CLR instruction is essential in scenarios where you want to ensure that an array starts with no lingering data from previous operations, which can help prevent unexpected behavior in your control logic. By resetting the array, you create a clean state for subsequent operations, which is particularly important in complex applications where data integrity is crucial.

In contrast, while other instructions like COP, FLL, and MOV are used for different data handling purposes—such as copying data from one location to another, filling an array with a specified value, or moving data between different memory locations—they do not specifically serve the purpose of clearing or resetting an entire array. Thus, CLR is the most appropriate choice for this task.