In a count up counter, what changes the accumulated value?

In a count up counter, the accumulated value is adjusted when a specific input logic changes. This typically means that the counter increments its value in response to a particular condition being met, such as receiving a high signal on an input that is designated for counting events.

For instance, in many PLC applications, a counter may be set up to increment every time a specific sensor is triggered or when a certain condition occurs in a logic operation. This allows for the counter to track events accurately over time, following a predetermined logic designed by the programmer.

Additionally, while other options mention various states that could affect the counter, they do not directly result in the incrementing of the counter’s value according to its fundamental operation. Thus, the primary mechanism for modifying its accumulated total hinges on the conditions defined in the input logic.