Alternate between 2 pumps

I need to be able to alternate between 2 pumps, wondering what is the best way to do this, using controllogix. If in auto and a start signal is sent then I need to be able to use pump1 and the next time I need to use pump2, so forth and so on.

Thanks

Each time the start signal is received, alternate a bit which controls which pump to run.

There is never a "best" way to alternate a bit. There are loads of examples on here, search for "flip-flop" and "toggle" and such like.

I like to use a counter, because it is retentive, use bit 0 as the alternating bit.