Network interface board having memory mapped mailbox...

Details Network interface board having memory mapped mailbox... Network interface board having memory mapped mailbox...

G - Physics

06

F

354/233

G06F 9/44 (2006.01) G05B 19/05 (2006.01)

Patent

CA 1339710

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. Theses 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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