Excavating
Patent
1992-06-24
1995-12-26
Beausoliel, Jr., Robert W.
Excavating
371 206, H04L 108
Patent
active
054794218
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to a serial controller wherein a main controller and a plurality of nodes are serially connected to each other, and at least one or a plurality of sensors or the like are connected to each node. More particularly, the Present invention relates to data input control to be executed at a main controller.
BACKGROUND ART
When a system such as a press machine, a machine tool, a construction machine, a ship, an aircraft, an unmanned conveying unit, an unmanned warehouse are central-controlled, a number of sensors for detecting the operative state of each section of the system and a number of actuators for controlling the state of the respective sections are required. For example, in the case of a press machine, the number of sensors and actuators exceeds 3000. For some systems, the number of sensors and actuators is greater.
As a central control system for central-controlling the aforementioned types of systems, it has been proposed a structure wherein a plurality of nodes are serially connected to each other, one or a plurality of sensors and actuators are connected to each node, and the respective nodes are successively connected to each other in the loop-shaped configurations via a main controller so that each node is controlled in response to a signal from the main controller.
In the case of the structure wherein the respective nodes are serially connected to each other in the above-described manner, there arises a problem as to how simultaneity of output from each node and simultaneity of control of each actuator are to be achieved. For example, in a structure wherein an address is allocated to each node and the node is controlled based on the allocated address, time delay attributable to the addressing process becomes a problem. For this reason, with respect to collection of outputs from the respective sensors and control of the respective actuators, satisfactory simultaneity cannot be achieved with the conventional structure.
Under such circumstances, the inventors abandoned technical concept of allocating an address to each node while employing a structure of serially-connected nodes, and proposed a serial controller in which each node is identified based on the order of connection of the respective nodes. In the serial controller of this type, since addressing process becomes unnecessary, time delay attributable to the addressing process is eliminated and a structure of the node is simplified.
The serial controller of this type is constructed as illustrated in FIG 4.
The serial controller is intended to be applied to a central control system for a press, and includes a host controller 200 adapted to totally control respective sections in the press. The serial controller further includes a main controller 100 which controls receiving and delivering of data between the main controller 100 and a plurality of serially connected nodes 10-1 to 10-N.
A group of sensors 1-1, 1- 2 . . . 1-N are arranged in respective sections of the press so as to detect the operative state of the respective sections of the press. Similarly, a group of actuators 2-1, 2-2 . . . 2-N are arranged in respective sections of the press so as to drive the respective sections of the press. The group of sensors 1-N and the group of actuators 2-N are connected to the node 10-N (N=1 to N). The nodes t0-1 to 10-N and the main controller 100 are serially connected to each other in a loop configuration.
FIG. 5 diagrammatically illustrates a frame structure of data frame signals usable in the central control system in case that the number N of nodes is five. These data frame signals are delivered from the main controller 100. After passing through the nodes 10-1 . . . 10-N, the signals return to the main controller 100. Incidentally, FIG. 5(a) shows a data frame signal generated immediately after it is outputted from the main controller 100, FIGS. 5(b), (c), (d) and (e) show data frame signals which are outputted from the nodes 10-1, 10-2, 10-3 and 10-4, and FIG. 5 (f) shows a data fram
REFERENCES:
patent: 3781792 (1973-12-01), Birkin
patent: 4019172 (1977-04-01), Srodes
patent: 4133504 (1979-01-01), Dobler
patent: 4245212 (1981-01-01), Cirimele
patent: 4606029 (1986-08-01), Nagao
patent: 4633468 (1986-12-01), Skatrud
patent: 4878049 (1989-10-01), Ochiai
patent: 5105426 (1992-04-01), Hagiwara
patent: 5163056 (1992-11-01), Hagiwara
patent: 5170338 (1992-12-01), Moritoki
patent: 5204865 (1993-04-01), Moritoki
International Search Report.
International Preliminary Examination.
Beausoliel, Jr. Robert W.
Kabushiki Kaisha Komatsu Seisakusho
Snyder Glenn
LandOfFree
Data input control device for serial controller does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Data input control device for serial controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Data input control device for serial controller will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1374468