Address assignment method for at least one bus device that has recently been connected to a bus system

• US 6,850,992 B2
• Filed: 08/06/2001
• Issued: 02/01/2005
• Est. Priority Date: 08/18/2000
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Heinrich, Andreas, Weiβbach, Bernhard
• Primary Examiner(s): Perveen, Rehana
• Application Number:
  US10/344,950
• Publication Number:
  US 20030167360A1
• Time in Patent Office: 1,275 Days
• Field of Search: 710/3, 710/8, 710/9, 710/10, 370/254, 370/471, 709/220, 709/221, 709/222
• US Class Current: 710/3
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 2012/40221 Profibus
• 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

Abstract

A bus device that has recently been connected to a bus system is first addressable at a pre-set address. A bus master transmits a new address and an identification to the bus device. The bus device compares the transmitted identification with an identification that has been stored in the bus device and assumes the transmitted new address, if the transmitted identification corresponds with the identification that has been stored in the bus device. The bus device is then addressable at the new address.

Claims

1. An address assignment method for at least one bus device that has been newly connected to a bus system, comprising:

transmitting a new address and an identification from a bus master to a bus device initially addressable at a pre-set address;

comparing, at the bus device, the identification transmitted from the bus master with a preset identification stored in the bus device; and

assuming, at the bus device, the new address transmitted from the bus master, if the identification transmitted from the bus master corresponds to the preset identification stored in the bus device, so that the bus device is subsequently addressable at the new address.

2. An address assignment method as claimed in claim 1, wherein said method does not comprise acknowledging, by the bus device, transmission of the identification and the new address.

3. An address assignment method as claimed in claim 1, further comprising checking by the bus master, before transmitting the identification and the new address, whether a different bus device is already addressable at the new address.

4. An address assignment method as claimed in claim 1, further comprising:

checking by the bus master, immediately after transmitting the identification and the new address, whether the bus device newly connected to the bus system is addressable at the new address, and

retransmitting the identification and the new address by the bus master, if the bus device newly connected to the bus system is not addressable.

5. An address assignment method as claimed in claim 1, further comprising retentively storing the new address by the bus device.

6. An address assignment method as claimed in claim 1, wherein the bus system uses a field bus.

7. An address assignment method as claimed in claim 1, wherein the bus system uses a PROFIBUS.

8. At least one computer readable medium storing a program to control a bus master to perform a method comprising:

transmitting a new address and an identification from a bus master to a bus device initially addressable at a pre-set address;

comparing, at the bus device, the identification transmitted from the bus master with a preset identification stored in the bus device; and

assuming, at the bus device, the new address transmitted from the bus master, if the identification transmitted from the bus master corresponds to the preset identification stored in the bus device, so that the bus device is subsequently addressable at the new address.

9. At least one computer readable medium as claimed in claim 8, wherein said method does not comprise acknowledging, by the bus device, transmission of the identification and the new address.

10. At least one computer readable medium as claimed in claim 8, said method further comprising checking by the bus master, before transmitting the identification and the new address, whether a different bus device is already addressable at the new address.

11. At least one computer readable medium as claimed in claim 8, further comprising:

checking by the bus master, immediately after transmitting the identification and the new address, whether the bus device newly connected to the bus system is addressable at the new address, and

retransmitting the identification and the new address by the bus master, if the bus device newly connected to the bus system is not addressable.

12. At least one computer readable medium as claimed in claim 8, further comprising retentively storing the new address by the bus device.

13. At least one computer readable medium as claimed in claim 8, wherein the bus system uses a field bus.

14. A bus master connected via a bus system to at least one bus device that has been newly connected to the bus system, comprising:

an output unit to transmit a new address and an identification to a bus device initially addressable at a pre-set address, the bus device comparing the identification transmitted from said bus master with a preset identification stored in the bus device and assuming the new address transmitted from said bus master, if the identification transmitted from said bus master corresponds to the preset identification stored in the bus device, so that the bus device is subsequently addressable at the new address.

15. A bus master as claimed in claim 14, further comprising a checking unit to check whether a different bus device is already addressable at the new address before transmitting the identification and the new address.

16. A bus master as claimed in claim 15,

wherein the checking unit also checks whether the bus device newly connected to the bus system is addressable at the new address, immediately after transmitting the identification and the new address, and

wherein the output unit retransmits the identification and the new address, if the bus device newly connected to the bus system is not addressable.

17. A bus master as claimed in claim 14, wherein the bus device uses a field bus.

18. A bus device newly connected via a bus system to a bus master, comprising:

an input unit to receive a new address and an identification from a bus master to a bus device initially addressable at a pre-set address;

at least one storage unit to store a preset identification; and

a processing unit to compare the identification transmitted from the bus master with the preset identification and to assume the new address transmitted from the bus master, if the identification transmitted from the bus master corresponds to the preset identification stored in said at least one storage unit, so that said bus device is subsequently addressable at the new address.

19. A bus device as claimed in claim 18, wherein said bus device does not acknowledge receipt of the identification and the new address.

20. A bus device as claimed in claim 18, wherein said at least one storage unit retentively stores the new address by the bus device.

21. A bus device as claimed in claim 18, wherein the bus system uses a field bus.