Boots – shoes – and leggings
Patent
1990-01-18
1993-09-28
Shaw, Gareth D.
Boots, shoes, and leggings
36494081, 36494062, 3649408, 3649747, 364DIG2, H04L 900, G06F 1314
Patent
active
052492680
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a transmission method of the multiplexed series type which can be used for exchanging information between the sensors, the actuators and programmable automata of a procedure.
BACKGROUND OF THE INVENTION
Generally, communication between the sensors, actuators and programmable automata is provided wire to wire, which represents considerable wiring costs without a real service quality.
The invention relates more particularly to a better adapted communications system which reduces the wiring costs and which permits the connection of all industrial equipment included in a control and checking system and complying with an appropriate standard.
Its objective is to design systems with evolutive modular structures from a limited range of material modules making mass production possible so as to reduce the costs.
This evolutive modular structure must make it possible to respond to a wide range of applications, by software personalization.
SUMMARY OF THE INVENTION
In such a system, the invention proposes a protocol for exchanging information between data processing equipment of programmable automaton or industrial computer type, instrumentation equipment of more or less intelligent sensor or actuator type and operator interfaces of individual actuator signalling and control type.
This protocol must be sufficiently general to allow equipment which may be of different origins to be readily interconnected so as to form an industrial checking and control system without any problem of conviviality between these different pieces of equipment.
The information exchanges take place by means of a line capable of effecting transmission, without acquittal of the multiplexed series type (for example coaxial cable, optical fibres), between components of the system (entities) for receiving or transmitting information from or to the communication carrier and to ensure physical and logic interfaces between the line tools and the application interfaces, line tools providing matching of the signals between the components of the system and the line, and a Bus Arbitrator.
The application interfaces may be of different types and may, for example, consist of: acquisition, specialized equipment, . . .); do so, such data consisting of sensor logic or analog acquisitions, controls from programmable automatic devices, interautomata data exchanges, specialized data required for the application; combination of the previously defined equipment but also, for example, intelligent instruments, reflex automata, sequential automata, control computers, maintenance assistance, specialized equipment required for the application.
Each exchange over the transmission line takes place by a succession: . . . , a control block, for example of "CRC" type (cyclic code for detecting consistency errors of the data), . . . , this frame corresponding to the nomenclature of the data which will be made available on the line, and control block, for example of "CRC" type, this frame containing the value of the data corresponding to this nomenclature, this word in fact representing the contents of the data identified by its nomenclature.
It should be noted that the use of a cyclic code, particularly reliable for detecting consistency errors of the exchanged information (for example of "CRC" type), makes it possible to make good the absence of an acquittal procedure in the information exchanges.
Thus, the nomenclature/information pair may be:
The information exchanges are timed by the Bus Arbitrator which broadcasts the nomenclatures cyclically over the line, and take place in accordance with the following procedure: with the nomenclature which has just been transmitted available on the line; by its nomenclature then read the information transmitted by the producer station; the transaction is carried out correctly and the cycle continues by sending a new nomenclature.
In the case of cyclic traffic, the functions of the Bus Arbitrator may then be summed up as follows: transmission frequency of this nomenclature
REFERENCES:
patent: 4393269 (1983-07-01), Konheim et al.
Drucker William A.
Katbab A.
Shaw Gareth D.
Telemecanique
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