Boots – shoes – and leggings
Patent
1989-04-19
1990-04-17
Shaw, Gareth D.
Boots, shoes, and leggings
364900, 3649210, 3649294, 3649295, G06F 1516
Patent
active
049185896
ABSTRACT:
An inter-processor communication module is inserted into a slot of an equipment rack of the type used to connect I/O modules to system processors in a programmable controller. Using two of the inter-processor communication modules in two respective racks, a supervisory processor is connected to two respective local area processors in a distributed control system. The inter-processor communication module has a serial channel controller that connects to the supervisory processor through a serial I/O port and a serial communication channel to communicate blocks of I/O status data. The serial channel controller is coupled to a backplane controller through a common memory and arbitration circuitry to exchange blocks of I/O status data. The backplane controller, which is also a part of the inter-processor communication module, plugs into the backplane of the rack and exchanges blocks of I/O status data with a local area processor. The two controllers also exchange processor status data to coordinate communications which are initiated by the supervisory processor and the local area processor. Methods of transferring I/O status data between the supervisory processor and the local area processors are also disclosed.
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Floro William E.
Luboski Mark
Murphy Timothy J.
Allen-Bradley Company Inc.
Fairbanks Jonathan C.
Shaw Gareth D.
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