The Stored Limited qualifier latches an action output to TRUE immediately when the step activates, then automatically resets it to FALSE after a specified duration.
Think of SL as a self-resetting version of S. You get the latching behavior, but you do not have to provide an explicit R - the timer handles the reset for you.
{GIF:HERE} - Step properties panel showing the action 'Temporary lock' with qualifier dropdown set to 'SL' (Stored Limited) and duration field set to 60000 ms
from automation_machine import ActionQualifier
step.add_action("temporary_lock", "Temporary lock", qualifier=ActionQualifier.SL, duration=60000)
The duration parameter is required and specifies how long (in milliseconds) the output stays TRUE before it automatically resets.