Controller capable of executing non-safety-related control logic. A safety module is added to the controller in order to increase the safety-integrity level of a control system. The controller is able to execute safety-related control of real-world objects. Such a control system may exist at an offshore...http://www.google.com/patents/US7813820?utm_source=gb-gplus-sharePatent US7813820 - Method to increase the safety integrity level of a control system
