PeanutBlake,
Allow me to thank you for joining this forum and try bringing together the Chinese community here.
Since you are planning the Libero Mfg classes, i like to inform you that Jairah (our webmistress is joining in to assist my present work writing up the above logic and testing over at the Manufacturing Test Plan. Hope you can join in to comment and maybe take up some exercise tasks. You can see the bigger scope here.