What does the CTU counter do in response to a specific event in a control process?

The CTU (Count Up) counter is designed to increment its count each time a specified event occurs within a control process. When the event or condition occurs, the counter increases its value by one. This behavior allows it to tally the number of occurrences over time, effectively keeping a running total until it is reset.

In addition, once the counting occurs, the CTU retains its total until a reset command is issued, which means the count does not automatically revert to zero after reaching a particular threshold or limit. This characteristic is essential in applications where tracking the number of events over time is necessary, such as in counting products on a production line or the number of cycles in a machinery process.

This functionality makes the CTU counter particularly useful in various industrial automation applications, where understanding the cumulative effect of events is critical for process control and monitoring.