<p>A stealth interface for an intelligent front-end communication system couples a plurality of actively redundant process control computers to a computer network. The stealth interface in each of the actively redundant process control computers includes a multi-ported memory for storing dynamic data associated with the physical process and for transferring this data to a front end computer which is in communication with the computer network. The multi-ported memory also includes a mailbox section for storing messages sent between the front end computer and its actively redundant process control computer. The stealth interface also includes a guardian circuit which ultimately controls the ability of the front end computer to write information to specific memory locations in the multi-ported data memory.</p>
申请公布号
DE69315210(T2)
申请公布日期
1998.03.19
申请号
DE1993615210T
申请日期
1993.06.01
申请人
THE DOW CHEMICAL CO., MIDLAND, MICH., US
发明人
SEDERLUND, EDWARD, R., SAGINAW, MI 48603, US;LINDESMITH, ROBERT, J., MIDLAND, MI 48640, US;THOMAS, NADENE, T., LAKE JACKSON, TX 77566, US;COWLES, RUSSELL, W., LAKE JACKSON, TX 77566, US