Programmable controller for executing block transfer with remote I/O interface racks
US4413319A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1981 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Mar 9, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B2219/15018
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A programmable controller has a main processor and a scanner circuit in a unit that is connected through a multi-channel, multi-drop serial data link to a plurality of remotely located I/O racks. The I/O racks are adapted for connection to I/O devices connected to control a machine or process. The I/O racks each have an adapter module that communicates with a plurality of I/O modules in its rack. The adapter modules in the various racks are connected through the serial data link to a scanner circuit. Using a series of messages, the scanner circuit and the adapters couple both words of I/O status data for low density I/O modules and blocks of I/O status data for high density I/O modules. The scanner circuit also interfaces the main processor to the serial data link, coupling both conventional I/O status data and blocks of I/O status data from the main processor and organizing this data in messages for transmission over the serial data link.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.