What occurs if the count up counter exceeds the preset value?

When a count up counter exceeds its preset value, it can continue counting beyond that limit. This functionality is typical in many PLC systems, where the counter is designed to keep increasing indefinitely even after surpassing the preset limit. This characteristic allows for more flexible applications where counting needs might exceed fixed values, thus providing additional functionality for tracking occurrences or events without being restricted by a predetermined maximum.

The ability to continue counting means that the counter can provide valuable information even after crossing the set threshold, which can be crucial in processes that require continuous monitoring. This is important in industrial settings where operations can exceed expected limits due to varying production rates or changes in conditions.

This feature contrasts with other options, as automatic resets, stopping the count, or generating errors are not standard behaviors for all counting devices in PLCs, limiting their functionality in many operational contexts.