Norman Sievert Shelvik

Title: Innovations by Norman Sievert Shelvik

Introduction

Norman Sievert Shelvik is a notable inventor based in Grafton, WI (US). He has made significant contributions to the field of safety systems, holding a total of 2 patents. His work focuses on enhancing the reliability and efficiency of dual-CPU safety systems.

Latest Patents

One of his latest patents is titled "Safety timer crosscheck diagnostic in a dual-CPU safety system." This invention involves a dual-processing unit with single clock source CPUs, where a safety I/O module enables each CPU to verify the accuracy of the clock source of the other CPU. The diagnostic process involves one CPU acting as the controlling unit while the other serves as the monitoring unit. Both CPUs are synchronized to initiate their safety functions simultaneously. The controlling CPU is programmed to be interrupted after a predetermined time, while the monitoring CPU is set to be interrupted shortly thereafter. This mechanism allows the monitoring CPU to verify that the perceived time is within an expected range, ensuring the accuracy of the clock source. The roles of the CPUs can be swapped to further validate the clock source accuracy.

Another significant patent by Shelvik is "Safety controller providing rapid recovery of safety program data." This innovation avoids the need for time-consuming re-certification of a control program loaded in a safety controller. It utilizes a digital snapshot and digital signature, where the snapshot provides a rapidly loadable memory image file, and the signature confirms that the loaded file matches a previously certified copy.

Career Highlights

Norman Shelvik is currently employed at Rockwell Automation Technologies Incorporated, where he continues to develop innovative safety solutions. His work has been instrumental in advancing safety technology in various applications.

Collaborations

Throughout his career, Shelvik has collaborated with notable colleagues, including Charles Martin Rischar and Raymond Louis Buvel. These collaborations have contributed to the development of cutting-edge safety technologies.

Conclusion

Norman Sievert Shelvik's contributions to safety systems through his patents demonstrate his commitment to innovation and reliability in technology. His work continues to influence the field, ensuring safer operational environments.