LAN interface which permits a host computer to obtain data without interrupting a ladder program executing in the interface
US5151978A · kind A · utility
242Cited by
3References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1990 |
| Grant date | Sep 29, 1992 |
| Priority date | — |
| Expiry date | Mar 22, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/128
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A control system allows for transferring messages between a programmable logic controller and a host computer over a serial data communications network. The programmable logic controller executes a ladder program and has an integral network interface module for permitting direct communicative coupling to the communications network. Messages can be received and sent by the programmable logic controller without interruption of the execution of the ladder program. The programmable logic controller can receive unsolicited messages from the host computer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.