Rockwell Automation Technologies Incorporated

Steven Terry Seidlitz

Taryl Jon Jasper

Rangarajan M Tallam

Alan J Campbell

Michael A Bush

Joseph P Izzo

Mark A Chaffee

Kevin E Colloton

David P Sullivan

Alex Yegorov

To improve integrity of time synchronization, a node in the safety rated system takes steps to ensure the time to which it is synchronized has not become corrupted. The node receives a synchronize request message from an adjacent network device, which includes the master time, and the node generates an offset value corresponding to a difference between a local time and the master time. The node stores the offset time into a safety memory to ensure that the offset value has data integrity and does not become corrupted. The node performs periodic skew detection between two devices to verify that the clocks remain synchronized. In addition, the node performs a local drift detection to detect if the frequency of the local oscillator on which the local clock value is based begins to change.

System and method of network synchronized time in safety applications

An industrial safety architecture integrates employee identity and enterprise-level security policy into plant-floor functional safety systems, allowing control and safety systems on the plant floor to regulate safe interactions with hazardous controlled machinery based on user identity or role. The architecture leverages existing employee identity and security policy data maintained on the corporate level of an industrial enterprise to manage identity- and/or role-based control and safety on the plant level. Safety authority systems at both the corporate level and the plant level of the industrial enterprise obtain employee and security policy data from corporate-level systems and provides this data in as SIL-rated manner to industrial control and safety systems on the plant floor, where the identity and security policy information is used by functional safety systems to control access to industrial systems as a function of user identity, role, certifications, or other qualifications.

User security credentials as an element of functional safety

A power electronics device with an improved IGBT protection mechanism is provided. More specifically, systems and methods are provided for shortening the duration of a shutdown test pulse, such that the power output to the load is substantially unaffected.

Power converter disable verification system and method

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Brookfield, WI, United States of America

Steven Terry Seidlitz