A controller for one or more pieces of industrial equipment is configured to perform a series of control functions each organized into one or more procedures for performing particular machine actions. The progress of an action, or some parameter of the action-taking machine (which may or may not be associated...http://www.google.com.tw/patents/US5950006?utm_source=gb-gplus-share專利 US5950006 - Object-oriented programmable controller
