Dual microprocessor intelligent programmable process control system with communication link
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United States of America Patent
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Jul 29, 1980
Grant Date -
N/A
app pub date -
Aug 24, 1978
filing date -
Aug 24, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An intelligent programmable process control system for controlling industrial processing and manufacturing equipment and the like utilizes a unique system of cooperating dual microprocessors. A digital microprocessor is utilized for digital computation and for controlling the analog portion of the processing equipment, and a boolean microprocessor is utilized for sequencing and for controlling the on/off states of devices located along the process in response to the on/off states of sensors located along the process according to a sequence of boolean logic functions. The digital microprocessor has overall supervisory control. Common memory provides a communication link between the two microprocessors. An arbitration circuit for resolving simultaneous or phased access to memory by the two microprocessors is provided. In addition, a circuit is provided for accomplishing parallel digital input/output functions, again accessible by both microprocessors. In one embodiment, means for linking arithmetic functions and non-arithmetic logic functions within a boolean-type instruction set is provided.
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