While the ONS remains energized, no other action will occur and the instructions following the ONS will not execute. Once that's the case, the following instructions will execute once. the first step is accomplished once a path is established to the ONS instruction and the bit is energized. The One Shot Instruction's main purpose is to let the current through on the rising edge and execute the set of instructions placed after it for a single scan cycle. What does the One Shot do in PLC Programming? The ONS is found on the input side of a ladder logic rung structure. A common example would be saving initial parameters of a process when it’s initialized. The One Shot instruction is extremely useful when you need to execute a certain instruction once. The instruction will not let the rung to evaluate again until the input is set back to LOW and then HIGH. The ONS, also known as the One Shot, instruction will allow the rung to execute once if the data leading to it is true.
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