slc 500

[richerdick]

If an output is used and switched on in a subroutine that is not called in subsequent program scans will it switch off again in the next scan or does it remain on unitil the rung that sets it is called again and changes state

cheers

 

[SteveBailey]

Once an output has been turned on or off, it will remain in that state until something tells it to change state again. Assuming that there is no other place in the ladder logic that changes the state of the output, its state will remain frozen while the subroutine is not called.