Excavating
Patent
1992-06-23
1994-10-18
Baker, Stephen M.
Excavating
34082516, 371 201, H04L 100
Patent
active
053575172
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention generally relates to a data transmission system in which a plurality of nodes are connected to a main controller to transmit data and, more particularly, to an error display device of a series control system which can suitably display various sorts of errors under control of the main controller.
BACKGROUND ART
In the case where it is desirable to control presses, machine tools, construction machines, ships, airplanes, unmanned or automatic carriers, unmanned warehouses or so on an integrated data processing basis, a multiplicity of sensors for detecting the states of the respective machines or warehouses and a multiplicity of actuators for controlling the states thereof become necessary. The number of such sensors and actuators amounts, in the case of the presses for example, to more than 3000 and in other cases, amounts to much more than the above.
Conventionally, there has been considered an integrated data processing system for controlling such sorts of machines or items on an integrated data processing basis, in which a plurality of nodes are connected in series, each of the nodes is connected to one or a plurality of sensors and actuators, and these nodes are connected in a ring form through a main controller so that each node is controlled by a signal received from the main controller.
In the case where the nodes are connected in series in this way, it becomes important how to secure the simultaneousness of outputs of the respective-sensors as well as the simultaneousness of control of the actuators. For example, when such an arrangement is considered that addresses are allocated to the respective notes and the nodes are controlled on the basis of the addresses, a time delay taken for the address processing becomes a problem, which results in that the satisfactory simultaneousness cannot be secured with respect to the collection of the outputs of the sensors and the control of the actuators.
To solve the problem, the inventors of the present application have suggested a series control system which nodes are connected in series, an idea of allocating addresses to the nodes is discarded and instead the nodes are identified by their connection sequence, whereby the need for address processing can be eliminated, the problem of the time delay caused by the address processing can be removed, and further the node structure can be remarkably simplified.
Such a series control system is arranged as shown in FIG. 4.
The series control system is suitably used in a centralized control system for controlling a press. In the system, a host controller 200 performs general control respective portions of the press. A main controller 100 controls data transfer with a plurality of nodes 10-1 to 10-N connected thereto. Groups of sensors 1-1, 1-2, . . . , and 1-N are provided to the respective portions of the press to detect the states of the press. Groups of actuators 2-1, 2-2, . . . , and 2-N are provided to the respective portions of the press to drive the associated presses. The sensor group 1-N and the actuator group 2-N are connected to the associated nodes 10-N (N=1 N) which in turn are connected in a loop form together with the main controller 100.
FIG. 5 shows frame structures of a data signal used in the system when the number N of nodes are set to be 5. The data frame signal is issued from the main controller 100, passed through the nodes 10-1, 10- 2, . . . , and 10-N and sent back to the main controller 100. FIG. 5(a) shows the data frame signal immediately after outputted from the main controller 100, FIGS. 5(b), (c), (d) and (e) show the data frame signals outputted from the nodes 10-1, 10-2, 10-3 and 10-4 respectively, and FIG. 5(f) shows the signal outputted from the node 10-5 (the signal to be fed back to the main controller 100 when N=5).
The contents of the respective signals having the frame structures of FIG. 5 are as follows. (sensor data) DI position
The respective nodes 10-1 to 10-N shown in FIG. 4 operate to add the detection data DIq of the sensor 1 conne
REFERENCES:
International Preliminary Examination Report.
International Search Report.
Baker Stephen M.
Kabushiki Kaisha Komatsu Seisakusho
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