Hi, What should be the preferred location of the ladder logic using HMI panel (as Master) and PLC controller (as slave)? Should it be in HMI or in the PLC? I was advise that the main logic should be in the PLC by one of the support. By the way, in case i made my logic in the PLC, do i need to make a ladder similar with the PLC? Or just utilize the tasks and tags? Kindly spare your ideas. Chritian