US2009112336A1PendingUtilityA1
System and method for implementing time synchronization monitoring and detection in a safety instrumented system
Individually held — no corporate assignee on recordPriority: Dec 20, 2005Filed: Dec 23, 2008Published: Apr 30, 2009
Est. expiryDec 20, 2025(expired)· nominal 20-yr term from priority
G06F 1/12
51
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Claims
Abstract
An apparatus, system and process is provided from communicating safety-related data, over an open system, from a sender to a receiver. Safety-related components, including function blocks, flexible function blocks, resource blocks and transducer blocks, as well as, safety-related objects are provided. Also, a time synchronization monitor is provided for monitoring timing distributions and determining when such distributions have drifted beyond an acceptable limit.
Claims
exact text as granted — not AI-modified1 . An apparatus comprising:
a processor configured to determine whether at least one message communicated over a transmission medium has not been queued by monitoring time synchronization by comparing an actual drift to an allowable drift, wherein the allowable drift is calculated by comparing a first black channel clock determined after processing of a previous time distribution to a second safety layer clock determined after processing of a current time distribution and multiplying the result by a constant; and a medium attachment unit, which communicates the time distributions and output messages between the processor and a transmission medium.
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