yes I solved. I understand, a very good comparison. But I thought of something simpler . because pumps in boilers can run for a very long time. Sometimes this may not be desirable. In the secondary circuit pump for heating, winter constantly trying for 6 months. so!

input 1 = 1   "6 months during winter open "  After
input 1 = 0   "6 months during summer closed"

But, In your project 1 pump runs for 1 year. Other year other pump.

I sent an e-file. But when the electricity is cut or "I1" is turned on, pulse generator reset? I do not know. very good.

What is your suggestion in attachment