Method and device for synchronizing the cycle time of a number of tican buses, and a corresponding bus system

A method for synchronizing at least two TTCAN buses connected via at least one bus user and in which cycle times of basic cycles exist, comprising:

• determining a global time in each of the at least two TTCAN buses;
• determining deviations in the global times of the at least two TTCAN buses from the global times;
• transmitting the deviations to the at least one bus user;
• and
• adjusting the cycle times to one another as a function of the deviations in the global times, so that the at least two TTCAN buses are synchronized with respect to the cycle times.

A device for synchronizing at least two TTCAN buses linked together by at least one bus user, comprising:

• a first arrangement for:
• determining a global time in each of the at least two TTCAN buses,
• determining deviations in the global times of the at least two TTCAN buses from the global times, and
• transmitting the deviations to the at least one bus user;
• and
• a second arrangement for adjusting the cycle times to one another as a function of the deviations in the global times, so that the at least two TTCAN buses are synchronized with respect to the cycle times.

A bus system, comprising:

• at least two data buses, a first data bus of the at least two data buses having a first number of users and a second data bus of the at least two data buses having a second number of users, wherein:
• the at least two data buses include at least two TTCAN buses,
• at least one user of one of the first number of users and the second number of users corresponding to at least one connection user, such that two of the at least two TTCAN buses are simultaneously connected to the at least one connection user, and the at least one connection user performing a time-master function for each TTCAN bus being included, the at least one connection user that performs the time-master function predefining a basic cycle having a cycle time, and
• if the bus system includes more than two TTCAN buses, the TTCAN buses are connected in such a manner that, in each instance, at least two of the TTCAN buses have at least one common connection user;
• and
• a synchronization arrangement for determining a global time in each TTCAN bus and transmitting deviations in individual global times to those of the first number of users and the second number of users having the time-master function for adjusting a respective cycle time.