One Shot

The OneShot instruction executes the blocks within its boundaries once when its trigger conditions become Boolean TRUE. On any subsequent execution scan of the Main Loop (or Function), the blocks within the boundaries will not be executed as long as the initial trigger condition remains unchanged. The trigger condition has to change to Boolean FALSE and then back to TRUE before the blocks within the instruction boundary are executed again.

Item	Name	Description
A	Trigger Type	User selectable option for how to trigger the instuction
B	Operand	Any value, variable, or function that returns a Boolean TRUE or FALSE state

Trigger Options

Operation	Description
high	Causes instruction to execute when the result of Ⓑ transitions from FALSE to TRUE
low	Causes instruction to execute when the result of Ⓑ transitions from TRUE to FALSE
changed	Causes instruction to execute when the result of Ⓑ transitions from FALSE to TRUE or TRUE to FALSE

Boolean Test

Timers