04162536 is referenced by 175 patents and cites 2 patents.

A parallel process controller capable of expandable, parallel operating multi-function control of processes. The process controller comprises programmable command memory modules, data memory modules, an input/output system, a programming panel, and a high speed data bus (N-bus).

The input/output system comprises input/output channels for intercommunication between the process controller and the external world. This intercommunication is repetitively updated for each input/output channel in an error-free manner that operates autonomously with respect to the remainder of the process controller. Each input/output channel incorporates a first dedicated area of a dedicated data memory module in which information is read and a second dedicated area of the data memory module in which information is written. The information read from the first dedicated area is transferred to external devices via a local modem-remote modem combination. Likewise, data written into the second dedicated area of the dedicated data memory module is transferred from the external device via the same remote modem-local modem combination.

Title
Digital input/output system and method
Application Number
646412
Publication Number
4162536
Application Date
January 30, 1978
Publication Date
July 24, 1979
Inventor
Richard E Morley
Mason
NH, US
Agent
Mattern Ware Davis & Stoltz
Assignee
Gould Modicon Div
IL, US
IPC
G08C 25/02
H04L 1/18
H04L 1/16
H04L 1/14
View Original Source