Programmable controller with I/O expansion module located in one

Details Programmable controller with I/O expansion module located in one Programmable controller with I/O expansion module located in one

1988-05-16

1989-11-21

Williams, Jr., Archie E.

Boots, shoes, and leggings

364132, 364137, 3649269, 36492693, 3649481, 36494068, 36494081, G06F 1338, G06F 1328, G06F 1310

Patent

active

048827029

ABSTRACT:
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 processor 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 backplane controller in the I/O expansion module to transfer data in or out of the bulk storage area. Besides the backplane 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.

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