Deterministic field bus and process for managing same such that when transmissions from one subscriber station are enabled transmissions from other subscriber stations are disabled

1. Process for management of a deterministic field bus providing communication of messages between several subscriber stations, each comprising at least one protocol controller responsible for generating and decoding a communication protocol, wherein at any moment:

transmissions from a first one of the subscriber stations onto the bus are enabled, then only one protocol controller is a sending protocol controller,

transmissions from other subscriber stations onto the bus are disabled, the protocol controllers of these subscriber stations are listening, the sending controller acting as a bus controller managing exchanges on the bus, which works in “active” or “normal” mode while sending, the other controllers working in “passive” mode in reception, wherein there is no timed combination of frame bits output from the different subscribers.

2. Process according to claim 1 , in which the configuration of the output level from each controller is monitored.

3. Process according to claim 1 , in which when a first controller which was in “passive” mode has to reply a second controller which was in “active” mode for as long as necessary for the response, the first controller puts itself in “active” mode to reply within an authorized time window and then goes back again to the “passive” mode.

4. Process for management of a deterministic field bus providing communication of messages between several subscriber stations, each comprising at least one protocol controller responsible for generating and decoding a communication protocol, wherein at any moment:

transmissions from a first one of the subscriber stations onto the bus are enabled, said first subscriber station being in an active state, then only one protocol controller of this first subscriber station being a sending protocol controller,

transmissions from other subscriber stations onto the bus are disabled, said other subscriber stations being in a passive state, the protocol controllers of these subscriber stations being listening,

the sending controller acting as a bus controller managing exchanges on the bus, which works in “active” or “normal” mode while sending, the other controllers working in “passive” mode in reception,

wherein subscriber stations are isolated from the bus if they are defective.

5. Process according to claim 1 , in which, in a data block containing multiple bits, every third bit is multi-sampled.

6. Deterministic field bus comprising a line providing communication of messages between several subscriber stations, each comprising at least one protocol controller responsible for generating and decoding a communication protocol, which comprises a management device including means of validating transmissions from a first one of the subscriber stations on the bus, and means of disabling transmissions from other stations onto the bus to give an exchange principle in which at any one time only the first subscriber station is sending, while the other subscriber stations remain receiving,

wherein each subscriber station comprises logical means placed between a controller and the corresponding bus driver circuit, comprising:

means for monitoring the configuration of the controller output level,

means for authorizing sending responses by slave subscriber stations,

means for isolating subscriber stations from the bus if the bus is defective.

7. Bus according to claim 6 , in which each subscriber station comprises two associated controllers.

8. Deterministic field bus comprising a line providing communication of messages between several subscriber stations, each comprising at least one protocol controller responsible for generating and decoding a communication protocol, which comprises a management device including means of validating transmissions from a first one of the subscriber stations on the bus, and means of disabling transmissions from other stations onto the bus to give an exchange principle in which at any one time only the first subscriber station is sending, while the other subscriber stations remain receiving,

wherein each subscriber station comprises a dedicated component performing the following functions:

security mechanisms enabling:

use of a window to authorize sending responses managed locally in slave subscriber stations,

isolation of subscriber stations from the bus if the bus is defective,

Multi-sampling of bits.