I am new to Function Block programming,Modicon Quantum PLC and Concept software. I have managed to write a program that runs the pumps on VFD's, but have an issue with pump alternating after a fixed time of 8 hours. Does anyone have an example of a multiple Concept function block program with 2 or more pumps that alternate to the other available pump because one pump fails or because the running pump has run for 8 hours and the remaining pump is avialble to switch to.