What does the OK LED indicate on the CompactLogix processor?

The OK LED on the CompactLogix processor is designed to indicate the overall health of the processor. When the OK LED is illuminated, it signifies that the processor is operating correctly and that there are no critical faults affecting its functionality. This provides users with immediate visual feedback regarding the status of the processor, allowing for quick identification of any potential issues.

In scenarios where the LED is off or blinking, it typically indicates a problem that needs to be addressed, such as a failure in the processor or a configuration error. Thus, this LED serves as a fundamental monitoring tool for ensuring reliable operation in industrial automation environments.

The other options do not accurately reflect the primary function of the OK LED. While it might be indicative of performance or system load indirectly, these aspects are not the LED's main purpose.