Thare are 7 sand filters,one backwash pump.now after evry 24 hours backwash sequence shoul start.Now say now for sand filter1 bw sequence has started and during that time another sf 24 hour gets over and it needs to go to backawsh at that time it should only go to sequence when the sf which is already in bw sequebce has completed it,so basically it will be like in stack in which each sf goes to bw sequence as per the request generated after thier respective 24 hour timer.

You can see the attached program and check if it suits your application. In it you can assign upto 8 (bool) inputs to FB which will then generate the sequence as per the incoming sequence of bool.

Sequnce if generated in instance DB of the FB.

Regards,

Manmeet

I did it with the tips given by you all,thanks a lot