Allocation of station addresses to communication users in a bus system

• US 7,583,690 B2
• Filed: 06/30/2004
• Issued: 09/01/2009
• Est. Priority Date: 07/07/2003
• Status: Expired due to Fees

• Current Assignee: Institut Fur Automation und Kommunikation EV, Siemens AG
• Original Assignee: Institut Fur Automation und Kommunikation EV, Siemens AG
• Inventors: Pöschmann, Axel, Flach, Manfred, Krogel, Petra, Tretter, Albert
• Primary Examiner(s): Pham; Chi H.
• Assistant Examiner(s): MEW, KEVIN D
• Application Number:
  US10/563,502
• Publication Number:
  US 20060253615A1
• Time in Patent Office: 1,889 Days
• Field of Search: 370/389, 370/392, 370/393, 370/431, 370/432, 370/474, 370/465, 370/489, 370/490, 370/475, 370/390, 709/211, 709/226, 710/4, 710/9
• US Class Current: 370/432
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: H04L 41/00 Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
• CPC Class Codes: H04L 61/5038 for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]
• CPC Class Codes: H04L 61/5046 Resolving address allocation conflicts; Testing of addresses testing when self-assigning an address H04L61/5092
• CPC Class Codes: H04L 61/5092 by self-assignment, e.g. picking addresses at random and testing if they are already in use

Abstract

The invention relates to a method for simplified allocation of station addresses to communication users in a bus system, and communication users in a bus system. A first communication user, which can automatically transmit to the bus, can allocate data to a station address, said data clearly identifying another communication user, or characterizing a station address as non-occupied. An additional communication user who has already sent a data packet with clearly identifying data to the first communication user in an earlier communication cycle by means of said communication user and who receives a data packet comprising data in a later communication cycle, whereby said data does not clearly identify said communication user, can automatically alter the station address thereof in a station address characterized as not being occupied.

Claims

1. A method of allocating station addresses to communication users arranged in a bus system, wherein communication on the bus system is organized in communication cycles, and a first communication user on the bus assigned a controlling role as a manager and having a database comprising a list of each possible station of the bus and a current allocation for each station address as either a communication user or a non-occupied station address is configured to:

autonomously transmit data to all station addresses on the bus system, allocate data to a each station address in the database, the data uniquely identifying a communication user, or characterize the station address as not allocated, the method comprising;

transmitting in a first communication cycle, by a first communication user on the bus, to all station addresses on the bus;

(a) a first broadcast request comprising a list of currently non-occupied station addresses from the database of the first communication user so that all other users on the bus can save the list of currently non-occupied station addresses; and

(b) a first new agent request to all station addresses on the bus requesting a new agent response, wherein;

(i) for each non-responsive station address in which no response is received, the current allocation is updated to non-occupied in the database, and

(ii) for each responsive station address in which a response comprising data uniquely identifying the agent at that station address is received, the current allocation is updated to a communication user and the data uniquely identifying the agent at that address is recorded in the database;

transmitting in a second communication cycle, by the manager;

(a) a second broadcast request to all station addresses on the bus comprising the list of currently non-occupied station addresses from the database of the first communication user as updated in the first communication cycle so that all other users on the bus can save the list of currently non-occupied station addresses; and

(b) a second new agent request addressed to each responsive station address on the bus comprising

(i) the data uniquely identifying the agent at that station address as recorded in the database as confirmation, thereby assuring the communication user at that station address of correct identification by the manager, and

(ii) the data uniquely identifying the agent at each responsive station address as recorded in the database, thereby allowing communications among communication users by correct identification.

2. The method according to claim 1, wherein the communication cycles have a variable cycle time.

3. The method according to claim 1, further comprising:

storing device information comprising data uniquely identifying the agent in a memory device assigned to the communication user;

accessing the stored device information via the bus system by the first communication user; and

reading the stored device information by the first communication user.

4. The method according to claim 3, further comprising automatically configuring the bus system by repeating the method steps.

5. A communication user in a bus system adapted to perform the steps of claim 1.

6. The method of allocating station addresses of claim 1 further comprising the first new agent request of the first communication cycle (iii) for each non-agent responsive station address in which the response is received but does not comprise data uniquely identifying the agent at that station address, the current allocation in the database for that station address is updated to a communication user without agent functionality, providing for communications with the communication user at that non-agent responsive station address without unique identification.

7. The method of allocating station addresses of claim 6 further comprising in the first new agent request of the first communication cycle (iv) for each conflicting station address, having more than one agent allocated thereto, no response is received, and the current allocation is updated to non-occupied in the database, so that the transmission by the manager during the second cycle identifying the conflicting station address as non-occupied signals the more than one agent allocated to the conflicting station address of the conflict so that the more than one agent allocated to the conflicting station address can automatically select a new station address from the list of currently non-occupied station addresses.

8. The method of allocating station addresses of claim 1 wherein the second new agent request comprises a data packet wherein a section of the data packet includes the data uniquely identifying the agent at each responsive station address.

9. The method of claim 8 wherein the data uniquely identifying the agent comprises component data or a serial number or both.

10. The method of allocating station addresses of claim 1 wherein the broadcast request comprises a data packet wherein a section of the data packet includes list of currently non-occupied station addresses.

11. A method of allocating station addresses to communication users arranged in a bus system that requires unique stations addresses for communication users to be able to communicate with one another, wherein communication on the bus system is organized in communication cycles, comprising:

transmitting in a first communication cycle, by a first communication user on the bus assigned a controlling role as a manager and having a database comprising a list of each possible station of the bus and a current allocation for each station address as either a communication user or a non-occupied station address, to all station addresses on the bus;

(a) a first broadcast request comprising a list of currently non-occupied station addresses from the database of the first communication user so that all other users on the bus can save the list of currently non-occupied station addresses; and

(b) a first new agent request to all station addresses on the bus requesting a new agent response, wherein;

(i) for each non-responsive station address in which no response is received, the current allocation is updated to non-occupied in the database, and

(ii) for each responsive station address in which a response comprising data uniquely identifying the agent at that station address is received, the current allocation is updated to a communication user and the data uniquely identifying the agent at that address is recorded in the database;

transmitting in a second communication cycle, by the manager;

(a) a second broadcast request to all station addresses on the bus comprising the list of currently non-occupied station addresses from the database of the first communication user as updated in the first communication cycle so that all other users on the bus can save the list of currently non-occupied station addresses; and

(b) a second new agent request addressed to each responsive station address on the bus comprising

(i) the data uniquely identifying the agent at that station address as recorded in the database as confirmation, thereby assuring the communication user at that station address of correct identification by the manager, and

(ii) the data uniquely identifying the agent at each responsive station address as recorded in the database, thereby allowing communications among communication users by correct identification.

12. The method of allocating station addresses to communication users of claim 11 further comprising in the first new agent request of the first communication cycle (iii) for each non-agent responsive station address in which the response is received but does not comprise data uniquely identifying the agent at that station address, the current allocation in the database for that station address is updated to a communication user without agent functionality, providing for communications with the communication user at that non-agent responsive station address without unique identification.

13. The method of allocating station addresses to communication users of claim 12 further comprising in the first new agent request of the first communication cycle (iv) for each conflicting station address, having more than one agent allocated thereto, no response is received, and the current allocation is updated to non-occupied in the database, so that the transmission by the manager during the second cycle identifying the conflicting station address as non-occupied signals the more than one agent allocated to the conflicting station address of the conflict so that the more than one agent allocated to the conflicting station address can automatically select a new station address from the list of currently non-occupied station addresses.

14. The method of allocating station addresses of claim 11 wherein the second new agent request comprises a data packet wherein a section of the data packet includes the data uniquely identifying the agent at each responsive station address.

15. The method of claim 14 wherein the data uniquely identifying the agent comprises component data or a serial number or both.

16. The method of allocating station addresses of claim 11 wherein the broadcast request comprises a data packet wherein a section of the data packet includes list of currently non-occupied station addresses.

17. A communication user in a bus system adapted to perform the steps of claim 11.