| 700 / | HD | DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS |
| 1 | DD | GENERIC CONTROL SYSTEM, APPARATUS OR PROCESS {15} |
| 28 | DD | .~ Optimization or adaptive control {13} |
| 40 | | .~.~ Plural modes {2} |
| 41 | DD | .~.~.~> Proportional-Integral (P-I) {1} |
| 43 | DD | .~.~.~> Proportional-Derivative (P-D) |