Device in a process system for determining statistical parameter
AssigneeRosemount Inc.
InventorsEvren Eryurek, Jogesh Warrior
Life of this patent
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Abstract
A process device couples to a process control loop. The process device receives process signals. A memory in the process device contains a nominal parameter value and a rule. Computing circuitry calculates a statistical parameter of the process signal and operates on the statistical parameter and the stored nominal value based upon the stored rule and responsively provides an event output based upon the operation. Output circuitry provides an output in response to the event output. The statistical parameter can be used in statistical process control systems.
Claims16
A process field device coupled to a process control loop, comprising:
- a process variable input to provide a process variable related to a process;
- computing circuitry configured to calculate a statistical parameter of the process variable;
- and
- output circuitry configured to output the statistical parameter on the process control loop for use in a statistical process control system.
A method performed in a process field device for a statistical process control system, comprising:
- obtaining a process variable related to a process;
- calculating a statistical parameter of the process variable;
- outputting the statistical parameter on a process control loop for use in statistical process control.
Dependencies are inferred from the claim text.