Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 248)

11Ć4
11.1.3 Example of the SET Instruction
When switch1 transitions from false to true, the
event MIX will be set and the program waiting
for MIX to become true will become ready to
run. If the waiting program is of a higher priority
than the one that executed this instruction, the
higherĆpriority program executes immediately
following the instruction.