Method for identifying and initializing devices which exchange data with each other and with a data processor in a communication network

• US 6,427,167 B1
• Filed: 02/11/1999
• Issued: 07/30/2002
• Est. Priority Date: 03/19/1998
• Status: Expired due to Fees

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Siedel, Bernd
• Primary Examiner(s): Burgess, Glenton B.
• Assistant Examiner(s): FIELDS, KENNETH WAYNE
• Application Number:
  US09/247,920
• Time in Patent Office: 1,265 Days
• Field of Search: 709/222, 709/221, 709/223, 709/230, 709/232, 709/227, 709/228, 714/48, 340/825, 370/400
• US Class Current: 709/222
• CPC Class Codes: G06F 12/0661 and decentralised selection
• CPC Class Codes: G06F 12/0684 with feedback, e.g. presence or absence of unit detected by addressing, overflow detection
• CPC Class Codes: G06F 15/177 Initialisation or configuration control processor initialisation G06F9/4405

Abstract

In a method for identifying and initializing devices that are connected to a communication system for data exchange with one another and with a data processing unit, the data processing unit checks whether the node number of a device in the logon of the device is unique for the communication via the communication system and if a node number is found that is not unique, the data processing unit requests that the device which transmitted to a non-unique node number change its node number to a unique node number.

Claims

1. A method for identifying and initializing a plurality of devices in a communication system comprising the steps of:

(a) providing a plurality of devices and a data processor and connecting said plurality of devices for data exchange with each other and with said data processor in a communication system;

(b) transmitting a logon signal from each device, comprising a node number and a device identifier, from each device connected in said communication system to said data processor;

(c) at said data processor, checking said node number for uniqueness from each device which transmitted a logon signal;

(d) upon identification of any node number in step (c) which is not unique, defining a unique node number for the device which transmitted the node number which is not unique dependent on said device identifier for said device which transmitted the node number which is not unique;

(e) transmitting an answerback of said node numbers from said data processor to the respective devices which transmitted a logon signal;

(f) at each device, acknowledging receipt of the answerback of said node number; and

(g) upon receiving said acknowledgment at said data processor, accepting each device which transmitted the acknowledgment in step (f) for operation in said communication system.

2. A method as claimed in claim 1 wherein step (a) comprises connecting said plurality of devices and said data processor in a CANOPEN communication system as said communication system.

3. A method as claimed in claim 1 wherein said communication system comprises services pre-defined by said communication system, and comprising conducting all communications between said devices and said data processor in steps (b), (e) and (f) using said services.

4. A method as claimed in claim 3 wherein step (a) comprises connecting said plurality of devices and said data processor in a CANOPEN communication system as said communication system, and wherein the communications for identifying and initializing said devices between said devices and said data processor in steps (b), (e) and (f) are conducted using emergency and SDO signals of said CANOPEN communication system.

5. A method as claimed in claim 1 wherein step (b) comprises transmitting said logon signal with said identifier containing encoded information.

6. A method as claimed in claim 5 wherein each of said devices has a unique ASCII string allocated thereto, and comprising the additional steps, at each device, for encoding information for said identifier by converting said ASCII string into a number, having a plurality of digits, using a HASH function of programming language C, and using some of said digits of said number to form said encoded information comprising said identifier.

7. A method as claimed in claim 1 wherein step (b) comprises cyclically transmitting said logon signals from the respective devices to said data processor.

8. A method as claimed in claim 7 wherein step (c) comprises checking whether any two of said devices have transmitted identical logon signals dependent on a cyclical occurrence of the respective logon signals at said data processor.

9. A method as claimed in claim 1 wherein said plurality of devices include devices designated as being substantially a same type, and comprising the step of, at said data processor, providing a range of node numbers for said devices designated as being of substantially the same type.

10. A method as claimed in claim 1 comprising providing a microcontroller on a PC plug card as said data processor.

11. A method as claimed in claim 1 comprising providing medical devices of a medical workstation as said plurality of devices.