Hi i am trying to track parts through a 10 station die. as they are being moved by a walking beam after each stamp. there are sensors in each station. but there will not always be parts in all stations. so I need to know when to make that station sensors active or not. I primarily program in modicon. and not quite this complicated. how ever I know I can do it with a sense register a set register and a bit rotate. just not sure how to set it up. any suggestions will be great