发明名称 |
Redundant, multitasking industrial controllers with synchronized data tables |
摘要 |
An industrial control system employs a primary and secondary controller each having a processor and at least one I/O data table. Updating of the secondary processor's I/O data table is performed prior to the same data being transmitted to the controlled process. This eliminates possible retrogressive control at the time of switch-over of control from the primary industrial controller to the secondary industrial controller. Additional I/O data tables may be provided in each of the primary and secondary industrial controllers. In the case of the secondary industrial controller, this duplicate I/O data table temporarily holds data until the transmission is complete preventing the partial update of the working I/O data table of the secondary industrial controller. The duplicate I/O data table in the primary industrial controller allows simultaneous outputting of the I/O data transmitted to the controlled process without corruption while the user program of the primary industrial controller resumes execution.
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申请公布号 |
US6411857(B1) |
申请公布日期 |
2002.06.25 |
申请号 |
US19990303940 |
申请日期 |
1999.05.03 |
申请人 |
ROCKWELL AUTOMATION TECHNOLOGIES, INC. |
发明人 |
FLOOD MARK A. |
分类号 |
G05B19/042;G05B19/05;G06F11/20;(IPC1-7):G05B19/18 |
主分类号 |
G05B19/042 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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