Excavating
Patent
1990-08-27
1993-04-20
Beausoliel, Jr., Robert W.
Excavating
G06F 702
Patent
active
052048659
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a data extracting circuit preferably employable for a serial control apparatus which has been hitherto used for a central control system available for various kinds of machines such as a press, a machine tool, a construction machine, a ship, an aircraft or the like machine as well as a central control system available for an unmanned conveying unit, an unmanned warehouse or the like installation.
BACKGROUND ART
When presses, machine tools, construction machines, ships, aircrafts, unmanned couveying units, unmanned warehouses or the like are to be centrally controlled, a large number of sensors for detecting the present operative state of each section in these machines or installations and a large number of actuators for controlling the present operative state of each section in these machines or installations are required. For example, in the case of a press, the number of required sensors and actuators exceeds 3000. In other case, each machine or installation may need to be equipped with sensors and actuators more than 3000 in number.
Hitherto, the central control system for centrally controlling the foregoing kinds of machines or installations is typically constructed such that a number of sensors and a number of actuators are connected to a main controller so that a number of sensor outputs are collected in the main controller which in turn controls the actuators.
With the conventional central control system as constructed in the above-described manner, as a large number of sensors and actuators are required, the number of connection lines extending between the main controller and the sensors/actuators increases enormously. In addition, an input/output section in the main controller becomes unavoidably complicated in structure.
To obviate the foregoing problem, a proposal has been made such that a plurality of nodes are serially arranged one after another, one or a plurality of sensors and actuators are connected to each node and the nodes are connected to each other via a main controller so that each node is properly controlled in response to a signal outputted from the main controller. With such a structure as described above, the main controller is basically required to have a plurality of signal input lines and a plurality of signal output lines by way of which the main controller is connected to the respective nodes, resulting in the number of wiring lines being reduced substantially.
However, in a case where the central control system is constructed such that the nodes are serially connected to each other, there arises a problem as to how simultaneous collection of outputs from the respective nodes and simultaneous control of the respective actuators are accomplished. For example, in the case of a structure wherein a specific address is allocated to each node to control the latter based on the allocated address, time delay caused by processing a plurality of allocated addresses becomes another problem. Thus, simultaneous collection of outputs from the respective sensors and simultaneous control of the respective actuators cannot be accomplished satisfactorily.
In view of the aforementioned facts, the inventors abandoned the technical concept that a plurality of nodes are serially connected to each other with a specific address allocated to each node. Instead of the foregoing technical concept, the inventors propose a serial control apparatus which is constructed such that each node is distinguished from other node in accordance with an order of node connection. With this proposed serial control apparatus, any address processing is not required and time delay caused by the address processing is eliminated with the result that a node structure can be simplified remarkably.
The proposed serial control apparatus is constructed such that each node successively adds output signals from sensors in the present node to a signal from nodes on the upstream side in compliance with a predetermined rule and signals specifically intended for the present node a
REFERENCES:
patent: 4789986 (1988-12-01), Koizumi et al.
patent: 4914657 (1990-04-01), Walter et al.
patent: 4991174 (1991-02-01), Mon et al.
"A Local Communications Network Based on Interconnected Token-Access Rings: A Tutonial" by Norman C. Strole, 1983, pp. 119-134.
Hagiwara Masao
Katayama Yukinori
Moritoki Masakazu
Takebe Makoto
Beausoliel, Jr. Robert W.
Chung Phung My
Kabushiki Kaisha Komatsu Seisakusho
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