Programmable controller having directly executable CPU instructions
US5905891A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 23, 1995 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Jan 23, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/15127
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A programmable controller (PC) which converts PC instructions directly into targeted CPU instructions, not into a macroprogram format, and stores them as an execution file. The PC stores restoration information for ladder display together with the CPU instructions, whereby the number of program steps to be executed is reduced and a ladder display can be provided. The PC also converts PC instructions written in the ladder language into restoration information restorable to the ladder language and generates them as a main processing restoration information file, then converts the PC instructions directly into targeted CPU instructions, not into a macroprogram format, on the basis of the restoration information file, and stores them as an execution file independently of the main processing restoration information file. Also, the execution file for sequence processing is separated from the main processing restoration information file for ladder display, ensuring that processing can be performed much faster without needing to judge whether a step is an execution instruction or display information. The PC incorporates conversion programs and conversion tables for generating finally requi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.