| 700 / | HD | DATA PROCESSING: GENERIC CONTROL SYSTEMS OR SPECIFIC APPLICATIONS |
| 1 | DD | GENERIC CONTROL SYSTEM, APPARATUS OR PROCESS {15} |
| 56 | DD | .~ Digital positioning (other than machine tool) {5} |
| 61 | DD | .~.~ Multiple axis motion or path control {3} |
| 63 | | .~.~.~ Including velocity or acceleration control |