Programmable controller with time periodic communication
US5428526A · kind A · utility
Inventors
Key dates
| Filing date | Feb 3, 1993 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Feb 3, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/25178
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A communication module has a backplane interface circuit that enables the module to communicate with other components of the programmable controller, and has a network interface circuit which sends and receives messages via a serial communication link. A memory within the module stores a designation of a starting time, a designation of a length of a message repeat interval, and a file of message information. A clock circuit determines when the starting time occurs and thereafter determines the expiration of each successive occurrence of the message repeat period. A control mechanism responds to the clock circuit determining an occurrence of the starting time or determining an expiration of a message repeat interval, by operating network interface circuit to transmit a message, that contains the message information, over the serial communication link.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.