Boots – shoes – and leggings
Patent
1990-01-12
1992-03-10
Ruggiero, Joseph
Boots, shoes, and leggings
34082506, 3642219, 364222, 3642411, 364921, 3649405, 364DIG1, 364DIG2, G06F 1546, G06F 1337
Patent
active
050954172
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to a method and an apparatus for carrying out serial control which are preferably employable for a central control system for a press machine, a machine tool, an unmanned conveying unit or the like installation. More particularly, the present invention relates to an improvement of the structure of an apparatus preferably employable for assuring simultaneity with detection data on a number of sensors and driving data on a number of actuators used for such a control system.
BACKGROUND ART
In a case where a press, a machine tool, a construction machine, a ship, an aircraft, an unmanned conveying unit, an unmanned warehouse or the like installation are centrally controlled, a large number of sensors (limit switch, actuating button, encoder or the like) for detecting an operative state of each unit in a system and actuators (valve, relay, lamp or the like) for controlling the operative state of each unit in the system are required. In a case of, e.g., the press, the number of sensors and actuators, as mentioned above, exceeds, 3,000. With respect to some other unit, it is expected that much more than 3,000 sensors and actuators will be required.
Hitherto, a generally available central control system for centrally controlling the aforementioned kind of units is typically constructed such that a number of sensors and a number of actuators are connected directly or via relaying means to a machine controller in parallel with each other, outputs from the sensors are received in the machine controller, and the actuators are driven under proper control in response to signals from the machine controller.
In a case of the conventional central control system as mentioned above, as the number of sensors and the number of actuators become very large, the number of connecting lines for connecting the machine controller to the sensors and the actuators, as well as the total length of connecting lines extending therebetween, not only become also very large but also erroneous line connection may take place. In addition, an input/output section in the machine controller becomes very complicated in structure.
To obviate the foregoing problems, a proposal has been made as to an arrangement in which a plurality of nodes are connected to each other in series, one or a plurality of sensors and one or a plurality of actuators are connected to each node, these plural nodes are connected to one after another via a main controller in a loop-shaped configuration or in a daisychain-shaped configuration and each node is controlled in response to signals from the main controller. With such an arrangement, basically, the main controller requires only signal input lines and signal output lines connected thereto. Similarly, each node requires only signal input lines and signal output lines connected thereto. Consequently, the number of connection lines to be connected to the main controller and the time required for a wiring operation can be reduced remarkably.
A conventional technique of making serial connection, as described above, is disclosed in, e.g., an official gazette of Japanese Laid-Open Patent No. 118048/1986. According to this conventional technique, a date frame signal is composed of a synchronous slot SYN, data slots DFa to DFe for five nodes a to e, an end slot E or the like, and a data length can be fixed by unchangeably allocating the date slots DFa to DFe to the five nodes, as shown in FIG. 1. Specifically, each node is constructed such that control data DO corresponding to a plurality of actuators at the node are extracted from the data region DF corresponding to the node in an inputted data frame signal and detection data Di from a plurality of sensors at the node are introduced into the data region DF. Here, a processing to be taken for a node b will be described as an example in detail in the following. Control data DOb on own node in the data frame signal are once stored in storing means for the node b and thereafter they are fed to a plurality of actuators. Fur
REFERENCES:
patent: 4811195 (1989-03-01), Evans
patent: 4831582 (1989-05-01), Miller et al.
patent: 4888714 (1989-12-01), Dingle
patent: 4951234 (1990-08-01), Bellows
patent: 4979094 (1990-12-01), Gemmell et al.
Hagiwara Masao
Moritoki Masakazu
Takebe Makoto
Kabushiki Kaisha Komatsu Seisakusho
Ruggiero Joseph
LandOfFree
Apparatus for carrying out serial control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for carrying out serial control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for carrying out serial control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2288977