A METHOD TO INCREASE A SAFETY-INTEGRITY LEVEL OF A CONTROLLER AND SYSTEM THEREOF

摘要

A method to increase a safely-integrity level of a Controller (10) for control of real-world objects, characterized by the steps of: attaching to the said Controller (10) a safety-hardware unit (11) via a single channel wherein the safety-hardware unit (11) communicates with the said Controller's CPU, downloading software with safety-related configuration data to the attached safety-hardware unit (11) and to the Controller (10), configuring the attached safety-hardware unit (11) to execute safety-function logic, which depends on the safety-related configuration data, and in an active or passive way set the Controller's (10) output values to a safe state for online safety control, wherein the Controller (10) has the capability of executing a set of non-safety-critical control functions, which set of non-safety-critical control functions is the same before of as well as after the safety-hardware unit (11) is attached.