Network interface board having memory mapped mailbox registers i

Details Network interface board having memory mapped mailbox registers i Network interface board having memory mapped mailbox registers i

1991-12-26

1993-10-05

Lee, Thomas C.

Boots, shoes, and leggings

364131, 364DIG2, 364921, 3649262, 36492794, 36492795, 36492796, 3649295, 36493144, 3649402, 36494062, 3649409, 3649424, 3649576, 3649654, 3649439, 34082516, 34082536, 371 291, G05B 1900, G06F 1130

Patent

active

052513025

ABSTRACT:
A network interface board provides a communication link between a personal computer and a network bus connecting a plurality of programmable logic controllers. The network interface board mounts in an expansion slot of the personal computer. The programmable logic controllers control the operation of various machines. The network interface board includes mailbox registers for storing messages from the network, including three different queues of alarm messages which the personal computer can access in any order. These messages could be in the form of program steps, allowing the personal computer to directly program a programmable logic controller over the communication network.

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