Which instruction enables the remainder of a ladder logic rung for only one program scan?

The One Shot Instruction (ONS) is designed specifically to enable the remainder of a ladder logic rung for only one program scan. When the rung containing the ONS instruction is true, it triggers a single "one shot" output that activates the subsequent logic for only that scan of the program. After the rung is evaluated and the program moves to the next cycle, the ONS instruction resets, ensuring that the output will not be triggered in subsequent scans unless the condition is re-established.

This functionality is particularly useful in scenarios where you want to detect transitions or events without creating a persistent condition, allowing for clean and efficient control of processes such as starting a sequence when a button is pressed without it continually activating on successive scans.

Other instruction types have different behaviors: for instance, a latch instruction maintains its state across scans until explicitly reset, while an input instruction simply reflects the physical state of an input device. The reset instruction, on the other hand, is used to reset a latch or other bits but does not serve the purpose of enabling logic for a single scan.