When using Studio 5000 retentive timer and counter instructions, what is the name of the output that must be used to reset the instructions?

The correct answer is "RES." In the context of Studio 5000 programming, particularly with retentive timers and counters, "RES" stands for "Reset." This instruction is specifically designed to reset the accumulated value of the timer or counter back to zero, effectively restarting the timing or counting process without affecting the configuration parameters.

Using the “RES” instruction is crucial for managing the state of timers and counters in a way that maintains their retentive characteristic. This means that, unlike a non-retentive timer or counter, the retentive versions can hold their last state even when power is lost, but they need a specific command to reset their count when desired.

While the other terms may seem plausible, they do not align with the standard instruction terminology used within Studio 5000. Understanding this distinction is important for effectively programming and manipulating timers and counters in an industrial automation environment.