OK you are quite right I missed typing in the other PL.
Actually I have missed quite a bit.
Need PL to stop ATO while water change.
Need PL to fill only salt water to full sensor is actived
Need PL to add time to drain because drain level is below your low sensor.
Turn off skimmer (Maybe same time as switching off for low return level and switches back on when return pump starts, but only during water change?



PL 12
input1: timer 5
input2: programmable logic 13
function SR Flipflop

Socket 8: PL 12 (This is drain pump?)

PL 13
input1: Water fill 1
Function delay ( How ever long it takes below low level sensor until ready to fill?

So how far below the low level sensor for the drain does it need to go. ie how long does it take to drain from the low level sensor until you wish to fill . And what is the total time it takes to drain the whole system.

What is sensor 5 used for???

This is all very complicated and is only a partial of the PL required.
Need more info on what feed pauses maintenance you are using and what is configured to shut off on them.
Are then any free feed pause numbers?

Timing for how long it takes to drain the tank to low level sensor
Time taken to drain tank from low level sensor to completed drain level
Time taken for the sea water pump to refill the sump.
How long does the skimmers need to be turned off for? Because if they don't come on till after fill, the tank will be low and ATO will fill with fresh water.


Will continue to look at this, but need to rethink some of it!

Just looking at your first post. You do have this shutting off the pump when it reaches the sensor, operating at the moment don't you?