Method and system for distributing data in a real time data imaging network

• US 5,864,680 A
• Filed: 06/05/1997
• Issued: 01/26/1999
• Est. Priority Date: 06/19/1992
• Status: Expired due to Term

• Current Assignee: Westinghouse Process Control, Inc. (Emerson Electric Company)
• Original Assignee: Westinghouse Electric Corporation (Paramount Global (f/k/a ViacomCBS Inc.))
• Inventors: Crew, Albert W., Edblad, Warren A., Staab, Carl J., Santoline, Linda L., Remley, Gilbert W.
• Primary Examiner(s): Swann, Tod R.
• Assistant Examiner(s): Tran, Denise
• Application Number:
  US08/869,473
• Time in Patent Office: 600 Days
• Field of Search: 395/200.03, 395/200.14, 395/200.17, 395/200.19, 395/200.31, 395/200.6, 395/200.66-200.67, 395/200.72, 395/200.78, 395/200.81 , 395/200.79, 345/501-502, 345/504-505, 345/508, 345/511-512, 345/526, 370/352, 370/400, 370/450, 370/466, 370/452, 370/468-470, 370/350
• US Class Current: 709/242
• CPC Class Codes: H04L 12/18 for broadcast or conference , e.g. multicast

Abstract

A computer network system repetitively distributes messages including uniquely identified blocks of real time data containing a current data image over a broadcast communications network to all real time stations for storage of each repetition of each entire block of data directly in station memory at a unique address space assigned to that uniquely identified block of data. The real time stations receive the blocks of data and alternatively receive other messages from the real time stations. The other messages have a recognized standard protocol, such as the TCP/IP or UDP/IP protocol of the Internet Protocol Suite.

Claims

1. A real time data imaging network system comprising:

a plurality of real time stations, each of said stations having memory means; and

a broadcast communications network connecting said stations including means for repetitively transmitting at least one message from each of a plurality of said stations to each other of said stations said at least one message having a uniquely identified block of data with each repetition containing a current data image, said each other of said stations including means for receiving said at least one message and storing means for storing each repetition of said uniquely identified block of data in a same unique address space in said memory means, said each other of said stations also including means for alternatively receiving another message from one of said stations, with said other message having one of a TCP/IP protocol and a UDP/IP protocol.

2. The network system of claim 1 wherein each of said real time stations generates at least one uniquely identified block of data and wherein said communications network repetitively transmits each of said uniquely identified blocks of data from each of said stations to each other of said stations, and wherein said storing means in each of said stations stores each repetition of each uniquely identified block of data in a same address space in said memory means unique to that uniquely identified block of data.

3. The network of claim 2 wherein at least some of said stations generate first and second sets of uniquely identified blocks of data, and wherein said communications network repetitively transmits said first set of uniquely identified blocks of data at a first repetition rate and transmits said second set of uniquely identified blocks of data at a second slower repetition rate.

4. The network system of claim 2 wherein said same address spaces are unique virtual address spaces and wherein said storing means includes means translating said unique virtual address space for each uniquely identified block of data into a physical address space in said memory means in which a current repetition of said uniquely identified block of data is stored.

5. The network system of claim 2 wherein each station includes a central processing unit, wherein said unique address spaces are unique virtual address spaces and wherein said storing means include means maintaining a list of available physical address spaces in said memory means, means storing a uniquely identified block of data received over said communications network highway in a selected one of said available physical address spaces in said memory means, and means translating said virtual address space into the selected physical address space for access to said block of data by said central processing unit.

6. The network system of claim 5 wherein said means maintaining said list of available physical address spaces and said means storing a uniquely identified block of data in a selected physical address space are provided in a network interface and wherein said translating means is a memory address unit.

7. The network system of claim 5 wherein said means maintaining said list of available physical address spaces in said memory means and said means translating said virtual address space into said selected physical address space are provided in said central processing unit and wherein said means storing said uniquely identified block of data received over said communications network is a network interface.

8. The network system of claim 1 wherein said one protocol is encapsulated within an FDDI asynchronous message.

9. The network system of claim 1 wherein each of said uniquely identified blocks of data is part of an FDDI synchronous message.

10. The network system of claim 1 wherein said means for repetitively transmitting periodically broadcasts from said plurality of said stations to said each other of said stations.

11. A method of distributing data in a real time data imaging network system comprising:

a plurality of real time stations, each of said stations containing a central processing unit, a memory and a network interface; and

a communications network interconnecting said stations through said network interfaces, said method comprising the steps of;

operating said central processing unit in each of said stations to repetitively assemble data into uniquely identified blocks of data containing a most recent data image;

broadcasting each repetition of each uniquely identified block of data assembled by each of said stations over said communications network in a message to every other of said stations;

receiving said message and storing in said memory at each of said every other of said stations each repetition of each uniquely identified block of data received from other of said stations over said communications network in a same unique address space in said memory for each uniquely identified block of data;

employing another message having one of a TCP/IP and a UDP/IP protocol; and

alternatively receiving said other message from one of said stations.

12. The method of claim 11 wherein said unique address spaces are unique virtual address spaces and wherein said storing step comprises:

storing each uniquely identified block of data received from other stations over said communications network in an available physical address space in said memory and translating said available physical address space into said unique virtual address space for that uniquely identified block of data.

13. The method of claim 12 including following translating the selected available address space into the unique virtual address space of the uniquely identified block of data stored at that physical address space, adding a physical address space at which a previous repetition of that uniquely identified block of data was stored to a list of available physical address spaces.

14. The method of claim 13 wherein said list of available physical address spaces is maintained in said network interface, wherein said network interface stores said uniquely identified blocks of data received over said communications network in said memory and wherein translating of said virtual address spaces into said selected physical address is accomplished by a memory address unit.

15. The method of claim 13 wherein said central processing unit at each station is programmed to maintain said list of available physical address spaces and to translate said virtual address space into said selected physical address space, and wherein said storing of said uniquely identified block of data received over said communications network in a selected physical address space is performed by said network interface means.

16. The method of claim 11 further comprising the step of:

encapsulating said one protocol within an FDDI asynchronous message.

17. The method of claim 11 further comprising the step of:

employing each of said uniquely identified blocks of data as part of an FDDI synchronous message.

18. A real time distributed process control system comprising:

a plurality of real time stations, each of said stations having memory means; and

a real time broadcast communications network connecting said stations including means periodically transmitting at least one message from each of a plurality of said stations to each other of said stations said at least one message having a uniquely identified block of data with each periodic transmission containing a current data image, said each other of said stations including means for receiving said at least one message and storing means for storing each periodic transmission of said uniquely identified block of data in a same unique address space in said memory means, said each other of said stations also including means for alternatively receiving another message from one of said stations, with said other message having one of a TCP/IP protocol and a UDP/IP protocol.

19. The process control system of claim 18 wherein said one protocol is encapsulated within an FDDI asynchronous message;

and wherein each of said uniquely identified blocks of data is part of an FDDI synchronous message.