Process and apparatus for controlling a programmable controller with efficient identification of operation completion
US5530888A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1991 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Feb 15, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/54
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A master programmable controller is linked to one or more processing units by a network that enables communication to or from the units under system program control. The communication is based on data link instructions that are organized in blocks, as a series of a one or more data link instructions for corresponding units, and are accessed for execution in a sequence established by a sequence program, stored at the programmable controller. One or more of the data link instructions have a corresponding operation completion flag addressing instruction for specifying the address of a flag that is set where the respective operations of the data link instructions are complete. The efficient programming and execution of the sequence program is provided by assembling the data link instructions that define communications with one or more units into a group that is served by a single operation completion flag addressing instruction. The master programmable controller memory has stored therein information concerning the operating condition, including completion status, of each of the one or more grouped data link instructions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.