Method for the cyclic transmission of data between at least two control devices with distributed operation

A bus subscriber station for use in a method for cyclic transmission of data over a serial bus between at least two control devices (10,11,12) connected to said serial bus, in which said data incorporated in a transmitted message passed between said at least two control devices over said serial bus is periodically updated in said one (10) of said at least two control devices (10,11,12) transmitting said message until the instant of said transmission, said bus subscriber station comprising

• an arithmetic/control unit (15, 18) including means for periodically providing updated data for transmission via said serial bus (20),
• a serial interface (17) to which said serial bus (20) is connected, wherein the serial interface h as a first shift register (30) in which said data to be transmitted are stored and a control circuit including means (36,31) for replacing at least so-me of said data stored previously in the first shift register (30) with updated data updated most recently in the interim by said arithmetic/control unit (15,18) after storing said data in the first shift register (30).

A bus subscriber station for use in a method for cyclic transmission of data over a serial bus between at least two control devices (10,11,12) connected to said serial bus, in which said data incorporated in a transmitted message passed between said at least two control devices over said serial bus is periodically updated in said one (10) of said at least two control devices (10,11,12) transmitting said message until the instant of said transmission, said bus subscriber station comprising

• a first control unit (18') and a second control unit (118'),
• a serial interface (17',17") to which said serial bus (20) is connected, wherein the serial interface has a shift register (30) into which said data received via said serial bus (20) are stored, and
• a control circuit including means (38,46) for making at least some of said data received in said shift register available for processing in the second control unit (118) as early as during a validity check of said data.

A bus subscriber station for use in a method for cyclic transmission of data over a serial bus between at least two control devices (10,11,12) connected to said serial bus, in which said data incorporated in a transmitted message passed between said at least two control devices over said serial bus is periodically updated in said one (10) of said at least two control devices (10,11,12) transmitting said message until the instant of said transmission, said bus subscriber station comprising

• a serial interface (17',17") to which said serial bus (20) is connected, wherein the serial interface has a first shift register (30) into which said data received via said serial bus (20) are stored, a second shift register (36) for parallel storage of said data received in said first shift register and means for storing said data received in said first shift register in said second shift register.