Multitasking industrial controller

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Details

36446805, 36446807, 36446901, 395651, 395670, G06F 1900, G06F 764, G06F 766, G06G 764, G06G 766

Patent

active

056361246

ABSTRACT:
A multitasking industrial controller for real-time control of machinery and the like permits the use of both periodic and event driven tasks by establishing a hierarchy of both task types in the form of priorities that resolve conflicts between events of the same and different types. The unpredictability of the event driven tasks on scheduling of tasks is addressed by watchdog time values assigned to each task which confirm timely execution of the task in practice despite the risk of preemption by other tasks. Flexible software definition of event driven tasks is made possible by delegating the detection of the events to input/output modules executing independently of the processor executing the operating system.

REFERENCES:
patent: 4736318 (1988-04-01), Delyani et al.
patent: 5193189 (1993-03-01), Flood et al.
patent: 5339425 (1994-08-01), Vanderah et al.

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