Controller deviation indicator
US4254412A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 1979 |
| Grant date | Mar 3, 1981 |
| Priority date | — |
| Expiry date | Jun 12, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C3/00
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A deviation indicator interface for simultaneously providing an indication of the deviation of the process value from the set point for each loop of a multi-loop controller is disclosed. The deviation indicator interface includes a plurality of deviation indicators, each deviation indicator providing an indication of the loop deviation of a single loop. Each deviation indicator includes a first, second and third indicator portion. The first indicator portion produces a visible signal whenever the loop process value exceeds the loop set point by at least a first amount, the first amount being adjustable. The second indicator portion produces a visible signal whenever the loop process value is less than the loop set point by at least a second amount, the second amount being adjustable. The third indicator portion produces a visible signal whenever the loop process value (1) is equal to the loop set point, (2) exceeds the loop set point by an amount less than the first amount, or (3) is less than the loop set point by an amount less than the second amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.