Boots – shoes – and leggings
Patent
1989-10-26
1992-12-08
Smith, Jerry
Boots, shoes, and leggings
364138, 3642411, 3649405, 371 201, 371 206, G06F 1546, G06F 1337, G06F 1100
Patent
active
051703386
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for carrying out serial control and a method of controlling the method wherein the apparatus and the method are preferably employable for a centralized control system for various machinery such as press, machine tool, construction machine, ship, aircraft or the like machine as well as a centralized control system for unmanned conveyor, unmanned warehouse or the like installation.
BACKGROUND ART
A number of sensors for detecting an operative state of each location in an installation such as press, machine tool, construction machine, ship, aircraft, unmanned conveyor, unmanned warehouse or the like as well as a number of actuators for controlling an operative state of each location in the above-described installation are required to centrally control the installation. For example, in the case of a press, more than 3,000 sensors and actuators are required. With respect to other installations, much more sensors and actuators will be required.
Hitherto, a centralized control system for centrally control this kind of installation is constructed such that a number of sensors and a number of actuators are connected to a main controller which receives outputs from the sensors and then controls the actuators in response to signals from the main controller.
With such conventional centralized control system, when the number of sensors and the number of actuators become very large, the result is that the number of conductors extending between the main controller and the sensors/actuators becomes very large and input/output sections in the main controller become very complicated in structure.
In view of the aforementioned fact, there has been made such a proposal that a plurality of nodes are connected in series one after another, one or plural sensors and one or plural actuators are connected to each node and these nodes are annularly connected to each other via a main controller to control each node in response to a signal from the main controller. In the case of this proposal, basically, the main controller requires only signal input conductors and signal output conductors and also each node requires only signal input conductors and signal output conductors. Consequently, the number of required conductors can be reduced remarkably.
However, in the case where the nodes are connected to each other in series in the above-described manner, there arises a problem in respect of how concurrence of receiving an output from each sensor and concurrence of controlling each actuator are assured for each node. For example, in the case where an address is allocated to each node which in turn is controlled based on this address, there arises another problem that time delay occurs due to a necessity for address processing. Therefore, the aforementioned proposal fails to assure satisfactory concurrence in relation to receiving of an output from each sensor and controlling of each actuator.
For the reason, the inventors have abandoned the above-described technical concept that a plurality of nodes are connected to each other in series and a certain address is allocated to each node. Instead of this technical concept, they have proposed a new approach to an apparatus for carrying out serial control wherein the respective nodes are distinguished from each other in accordance with an order of connecting the nodes to each other with the result that any address processing is not required, time delay accompanied by such address processing does not occur and each node can substantially be simplified in structure.
According to this proposal, ,each node is constructed such that a signal from each actuator is successively added to a signal from the node at the preceding stage in accordance with a predetermined rule and then a predetermined signal is successively subtracted from the signal from the node at the preceding stage in accordance with another predetermined rule to output the resultant signal to another actuator. In this case, no address is required for each node and ther
REFERENCES:
patent: 4241398 (1980-12-01), Caril
patent: 4451898 (1984-05-01), Palermo et al.
patent: 4468791 (1984-08-01), Masek
patent: 4663706 (1987-05-01), Allen et al.
patent: 4907227 (1990-03-01), Unno
patent: 4910736 (1990-03-01), Tanaka et al.
patent: 4914654 (1990-04-01), Matsuda et al.
patent: 5105426 (1992-04-01), Hagiwara
IBM-Technical Disclosure Bulletin, "Fault Location In Serial Loop Data-Transmission Systems", C. E. Owen, vol. 15, No. 2, Jul. 1972.
Hagiwara Masao
Katayama Yukinori
Moritoki Masakazu
Gordon Paul
Kabushiki Kaisha Komatsu Seisakusho
Ramik Vincent L.
Smith Jerry
LandOfFree
Apparatus for carrying out serial control and method of controll 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 and method of controll, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for carrying out serial control and method of controll will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-964724