LAN interface which permits a host computer to obtain data witho

Details LAN interface which permits a host computer to obtain data witho LAN interface which permits a host computer to obtain data witho

1990-03-22

1992-09-29

Lee, Thomas C.

Boots, shoes, and leggings

364DIG1, 36492794, 36423951, G06F 1312

Patent

active

051519780

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.

REFERENCES:
patent: 4424565 (1984-01-01), Larson
patent: 4858112 (1989-08-01), Puerzer et al.
patent: 4969083 (1990-11-01), Gates
Dictionary of Computers, Information Processing and Telecommunications, Second Edition (1987) p. 363.
Bit Com Communications Program, A Communications Program for IBM Personal Computers and Compatibles, User's Manual Version 3.5, fifth edition (Aug. 1987), p. 42.

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