Process for transmitting data between entities capable of emitting and/or receiving data

Claim 1

Method for transmitting information between a plurality of producer and receiver entities of a control and checking system of an industrial equipment, comprising sensors as producing entities, actuators as receiving entities and programmable controllers as producing/receiving entities, said information being transmitted by means of a series-multiplexed type transmission line on which said entities may be connected to form a network and brought into service so as to transmit information on said line and to have access to all the information flowing on said line, said information being modelled by a distributed data base including a collection of data grouped together so as to form a plurality of objects, each having a specification and a value, each entity comprising a memory storing a copy of the specification and the value of at least one object which concerns it, wherein, for each new entity brought into service on the line and which processes and consumes one of said objects, said method comprises the following steps: a step of transmitting on the line the specification of said object, a step of receiving said transmitted specification by every entity concerned by said object, a step of comparing in each of said entities the received specification with the specifications included in the memory of said entity, a step of generating an invalidation information of the object in one of said entities when the comparison effected in this entity reveals a difference, a step of generating a validation information of the object in one of said entities when the comparison effected in this entity reveals an identity, only the entity which has generated a validation information being habilited to participate in an exchange of the value of the object.