G - Physics – 06 – F
Patent
G - Physics
06
F
354/230.3
G06F 13/38 (2006.01) G06F 13/10 (2006.01) G06F 13/28 (2006.01)
Patent
CA 1288872
Abstract of the Disclosure The capacity of programmable controllers with a processor module and I/O modules connected in a single equipment rack is expanded by connecting an I/O expansion module in one of the positions normally occupied by a conventional I/O module. The I/O expansion module communicates with the processor module through the rack backplane and also communicates with other racks of I/O modules and with node I/O modules through a serial data channel. Data for I/O modules on the serial data channel are stored in a bulk storage area in the proces- sor module to expand the effective size of an image table of I/O status data that is maintained by the processor module. The processor module is programmed to operate with a back- plane controller in the I/O expansion module to transfer data in or out of the bulk storage area. Besides the back- plane controller, the I/O expansion module includes a serial channel controller, a common memory and arbitration circuity which allows the controllers to alternate access to the common memory and to exchange data. The serial channel controller controls multiplexing and demultiplexing of I/O status data with the I/O modules through the serial data channel.
529121
Luboski Mark
Murphy Timothy J.
Struger Odo J.
Allen-Bradley Company Inc.
Shapiro Cohen
LandOfFree
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