초록 ▼

A device in a process control system includes a memory for storing a series of sensed process variables and command outputs representative of a learned process cycle. Comparison circuitry compares recent process information to learned process information stored in the memory and responsively provide

A device in a process control system includes a memory for storing a series of sensed process variables and command outputs representative of a learned process cycle. Comparison circuitry compares recent process information to learned process information stored in the memory and responsively provides a validity output signal. A method includes learning a cycle of a process to provide learned process information which comprises stored process variables and stored control signals over a time period, measuring a process variable in the process and responsively calculating the control output, storing the process variable in the control output to provide recent process information, and comparing the recent process information to the learned process information and responsively providing a validity output signal.

대표청구항 ▼

[ What is claimed is:] [1.] A method for validating a control output from a field device in a process, the method comprising:learning a cycle of the process to provide a learned process information, the learned process information comprising stored process variables and stored control outputs over a

[ What is claimed is:] [1.] A method for validating a control output from a field device in a process, the method comprising:learning a cycle of the process to provide a learned process information, the learned process information comprising stored process variables and stored control outputs over a specified time period;measuring a current process variable in the process and calculating the current control output for the process as a function of the current process variable to provide current process information; andcomparing the current process information to the learned process information in a validation circuit and providing a validity signal, the validity signal indicating that the current control output has exceeded a predetermined boundary derived from the learned process information.