Data exchange between users connected by a bus system and having separate time bases

A method for an exchange of data in messages between at least two users connected by a bus system and having a separate time bases, comprising:

• causing the at least two users to transmit data via the bus system in the messages;
• causing a first one of the at least two users, in a function as timer, to control the messages as a function of time such that the first one of the at least two users repeatedly transmits a reference message including a first time information regarding a time base of the first one of the at least two users, via the bus system at a specifiable time interval;
• causing at least a second one of the at least two users to form a second time information in accordance with a time base of the at least second one of the at least two users, as a function of the first time information;
• ascertaining a correction value from the first time information and the second time information;
• causing the at least second one of the at least two users to adapt as a function of the correction value at least one of the second time information and the time base of the at least second one of the at least two users;
• subdividing the specifiable time interval into timing windows of a specifiable length;
• transmitting the messages including the data in the timing windows;
• and
• combining the reference message and subsequent ones of the timing windows up to a next reference message to form a first cycle of at least one of the specifiable length and a specifiable structure, wherein:
• the specifiable structure corresponds to the specifiable length, number, and time position of the timing windows in the specifiable time interval following the reference message.

A device for an exchange of data in messages between at least two users connected by a bus system and having separate time bases but operating at a same bus speed, comprising:

• an arrangement for causing the at least two users to transmit data via the bus system in the messages, the at least two users transmitting the data at the same bus speed;
• an arrangement for causing a first one of the at least two users, in a function as timer, to control the messages as a function of time such that the first one of the at least two users repeatedly transmits a reference message including a first time information regarding a time base of the first one of the at least two users, via the bus system at a specifiable time interval;
• an arrangement for causing at least a second one of the at least two users to form a second time information in accordance with a time base of the at least second one of the at least two users, as a function of the first time information;
• an arrangement for ascertaining a correction value from the first time information and the second time information;
• and
• an arrangement for causing the at least second one of the at least two users to adapt as a function of the correction value at least one of the second time information and the time base of the at least second one of the at least two users, wherein the at least two users continue to operate at the same bus speed.