发明名称 |
HIERARCHICAL I/O SYSTEM FOR EXPANSION OF SMALL CONTROLLERS |
摘要 |
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. |
申请公布号 |
CA1288872(C) |
申请公布日期 |
1991.09.10 |
申请号 |
CA19870529121 |
申请日期 |
1987.02.05 |
申请人 |
ALLEN-BRADLEY COMPANY, INC. |
发明人 |
STRUGER, ODO J.;LUBOSKI, MARK;MURPHY, TIMOTHY J. |
分类号 |
G06F13/10;G06F13/28;G06F13/38 |
主分类号 |
G06F13/10 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|