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Process for transmitting data between entities capable of emitting and/or receiving data
| Details |
Inventors: Doucet, Rene;
Assignee: Telemecanique (FR)
Primary Examiner: Shaw; Gareth D.
Assistant Examiner: Katbab; A.
Attorney, Agent or Firm: Drucker; William A.
The process disclosed is appliable to transmission of data of the multiplexed series type between entities capable of emitting or receiving data, to or from the line. Each entity connected to the line can access all the data flowing in the line, and all the exchanged data are modeled by a distributed data base which is updated and maintianed by the fact that each entity stores and updates a local copy of the corresponding useful part of the data base it contains. Each time an entity is placed in service, a coherence check is carried out to ensure that the emitting and consuming entities interpret data in the same way. The coherence check is carried out by a protocol without prior contact or acknowledgement. |
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DETAILED DESCRIPTION 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: reception equipment (logic, analog outputs, interface displays of data acquisition, specialized equipment, .
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); transmission equipment which transmits data over the line when requested to 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; reception and transmission equipment which may be the result of a 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: of a first frame which may for example comprise a preamble, a 16 bit word,
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