Method for checking the syntax of an instruction list program to determine if the program is expressible as a relay ladder diagram by a programmable logic controller
US5058052A · kind A · utility
10Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1989 |
| Grant date | Oct 15, 1991 |
| Priority date | — |
| Expiry date | Oct 16, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F9/44589
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method is provided by which a programmable logic controller checks each statement of an instruction list (IL) program to determine if any such statement or the order of statements violates one of a set of syntax rules which are stored in a memory in the controller. If a rule violation is found, an error indication is generated to signify that the particular IL program under test by the controller can not be accurately converted or translated into a relay ladder diagram. However, if no rule violation is found by the controller, then the controller accepts the IL program.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.