초록 ▼

A process control system is disclosed in which process variables are treated as mapped in n-dimensional space, where n is the number of orthogonal directions. Three functions, set, check, and term, provide the link between expected and actual conditions. The check and term functions operate on ortho

A process control system is disclosed in which process variables are treated as mapped in n-dimensional space, where n is the number of orthogonal directions. Three functions, set, check, and term, provide the link between expected and actual conditions. The check and term functions operate on orthogonal coordinates. Each parameter has a guard band to provide a soft boundary for the parameter.

대표청구항 ▼

A method for controlling a parameter in a multi-parameter process comprising the steps of: setting the parameter to a desired value; producing an electrical signal related to said parameter; checking the magnitude of said signal against first and second sets of predetermined limits, wherein said fir

A method for controlling a parameter in a multi-parameter process comprising the steps of: setting the parameter to a desired value; producing an electrical signal related to said parameter; checking the magnitude of said signal against first and second sets of predetermined limits, wherein said first set of limits is wider than and includes said second set of limits; and continuing said process if said signal is within said first set of limits; recording said signal when said signal is within a guard band, viz. within said first set of limits and outside of said second set of limits; terminating said process if said signal is not within said first set of limits, indicating a fault condition.