Apparatus for networking programmable logic controllers to host

Details Apparatus for networking programmable logic controllers to host Apparatus for networking programmable logic controllers to host

1992-03-11

1992-10-27

Eng, David Y

Boots, shoes, and leggings

3642844, 364DIG1, G06F 1516

Patent

active

051596733

ABSTRACT:
A control system allows for transferring messages between a programmable logic controller and a host computer over an Ethernet communications network. The messages include a routing address specifying an originating drop number, a destination drop number, and a routing drop number. The system is responsive to the routing address for transferring the messages between the programmable logic controller and the host computer. The host computer can immediately obtain messages from a programmable logic controller without interruption of the execution of its ladder program. The host computer can also receive unsolicited messages from the programmable logic controller.

REFERENCES:
patent: 4271507 (1981-06-01), Gable
patent: 4412285 (1983-10-01), Neches et al.
patent: 4482982 (1984-11-01), Yu
patent: 4672570 (1987-06-01), Benker

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