Initialization of a local bus

A local bus master of a local bus, in particular of a ring bus, with data bus subscribers, the local bus master comprising:

• a transmitter to send a first data packet to all data bus subscribers for counting communication-ready data bus subscribers in a sequence, the first data packet having a first counter value for each communication-ready data bus subscriber in sequence to change this first counter value;
• a receiver to receive the first data packet having the first counter value that each communication-ready data bus subscriber has changed;
• and
• a second transmitter to send a plurality of second data packets, the number thereof being based on the first counter value of the received first data packet, each of the second data packets being assigned to one of the communication-ready data bus subscribers based on the respective relative position of the communication-ready data bus subscribers in the sequence.

A method for communication with a local bus master of a local bus, in particular of a ring bus, with communication-ready data bus subscribers, the method comprising:

• receiving at a communication-ready data bus subscriber a first data packet from a local bus master, the first data packet having a first counter value;
• changing the first counter value in the first data packet by the communication-ready data bus subscriber;
• receiving a plurality of second data packets;
• and
• writing information stored in the communication-ready data bus subscriber into a field of one of the second data packets when the second data packet is assigned to the communication-ready data bus subscriber.

A communication-ready data bus subscriber of a local bus, in particular a ring bus, having a local bus master, the communication-ready data bus subscribers comprising:

• a receiver to receive a first data packet from the local bus master, the first data packet having a first counter value;
• a counter to change the first counter value in the first data packet;
• a second receiver to receive a plurality of second data packets;
• and
• a writer to write information stored in the communication-ready data bus subscriber into a field of one of the second data packets if the second data packet is assigned to the communication-ready data bus subscriber.