Network control architecture and protocol for a distributed control, data acquisition and data distribution system and process

• US 8,363,680 B2
• Filed: 10/29/2009
• Issued: 01/29/2013
• Est. Priority Date: 10/29/2009
• Status: Active Grant

• Current Assignee: Precision Microdynamics, Inc.
• Original Assignee: Precision Microdynamics, Inc.
• Inventors: Erlic, Tomislav, Erlic, Mile, Field, Glen Arthur, Harris, David Peter
• Primary Examiner(s): Moore, Jr., Michael J
• Application Number:
  US12/934,231
• Publication Number:
  US 20120131130A1
• Time in Patent Office: 1,188 Days
• Field of Search: None
• US Class Current: 370/503
• CPC Class Codes: G05B 19/0421 Multiprocessor system
• CPC Class Codes: G05B 2219/2238 Several masters at same time
• CPC Class Codes: H04L 12/403 with centralised control, e.g. polling
• CPC Class Codes: H04L 12/4035 in which slots of a TDMA packet structure are assigned based on a contention resolution carried out at a master unit TDM/TDMA multiplex systems per se H04J3/1694; hybrid switching systems H04L12/64
• CPC Class Codes: H04L 12/44 Star or tree networks
• CPC Class Codes: H04L 12/4625 Single bridge functionality, e.g. connection of two networks over a single bridge
• CPC Class Codes: H04L 2012/4026 Bus for use in automation systems

Abstract

A system and process for distributed control, data acquisition and data distribution. The system and process comprise a one or more chain of nodes configured to remove and add packets to a synchronous data stream without management or control of a master node. Additionally, the nodes are provided with offset parameters to affect synchronous activity.

Claims

1. A real-time network control architecture for a distributed control, data acquisition and data distribution system of an industrial plant having a plurality of actuators and transducers for controlling and monitoring aspects of the plant comprising:

a first chain of nodes wherein each node is coupled to a network connection and to one of an actuator and a transducer in the industrial plant, the first chain of nodes including a first terminus end node at a first end of the first chain of nodes, a second terminus end node at a second end of the first chain of nodes, and a first intermediate node between the first terminus end node and the second terminus end node, wherein the first terminus end node is configured to periodically generate a first synchronous data stream for transmission through the first chain of nodes to the second terminus end node and back to the first terminus end node, and wherein each node of the first chain of nodes is configured to automatically move data one of to and from the first synchronous data stream at a determined synchronous time interval without management of a master node as the first synchronous data stream passes through the node, wherein the data moved to and from the first synchronous data stream relates to one of monitoring and controlling the one of an actuator and a transducer coupled to the node.

2. The system of claim 1 wherein each node includes a memory having configuration information for configuring the node at start-up for moving data one of to and from the synchronous data stream as it goes through the node.

3. The system of claim 2 wherein the memory includes a circular buffer for transferring data one of to and from the synchronous data stream as it goes through the node.

4. The system of claim 1 comprising a second intermediate node between the first terminus end node and the second terminus end node.

5. The system of claim 1 comprising a second chain of nodes wherein each node is coupled to a network connection, the second chain of nodes including the first terminus end node at a first end of the second chain of nodes and a third terminus end node at a second end of the second chain of nodes wherein the first terminus end node is configured to periodically generate a second synchronous data stream for transmission through the second chain of nodes to the third terminus end node and back to the first terminus end node, and wherein each node of the second chain of nodes is configured to automatically move data one of to and from the second synchronous data stream without management from a master node as the second synchronous data stream passes through the node.

6. The system of claim 5 comprising a first intermediate node in the second chain of nodes between the first terminus end node and the third terminus end node.

7. The system of claim 5 wherein the first terminus end node includes a switch for moving data from the first chain of nodes to the second chain of nodes.

8. The system of claim 1 wherein the determined synchronous time interval is an offset and each node is configured to calculate the offset due to propagation delays of the synchronous data stream to keep the first chain of nodes synchronized.

9. The system of claim 4 wherein each of the first intermediate node and the second intermediate node includes a first port connected to the network connection and a second port connected to the network connection.

10. The system of claim 1 wherein each node includes a configurable logic section containing parallel processing primitives.

11. The system of claim 1 wherein each node of the first chain is configured to be assigned a unique identifier during a first enumeration data stream generated by the first terminus end node.

12. A system for distributed control, data acquisition and data distribution across a plurality of networked nodes of an industrial plant having a plurality of actuators and transducers for controlling and monitoring aspects of the plant comprising:

a first chain of nodes connected by a network, the first chain of nodes including a first terminus end node, a plurality of intermediate nodes and a second terminus end node wherein each of the nodes is coupled to one of an actuator and a transducer in the industrial plant and are configured at start-up to one of remove one or more packets of data and add one or more packets of data to a synchronous data stream at a determined synchronous time interval transmitted from the first terminus end node through the intermediate nodes to the second terminus end node and back to the first terminus end node on a periodic basis without management of a master node and to compute and update propagation delay offsets of the synchronous data stream to update the determined synchronous time interval and provide for synchronous activity of the actuators and transducers in the plant by the nodes, wherein the data moved to and from the synchronous data stream relates to one of monitoring and controlling the one of an actuator and a transducer coupled to the node.

13. The system of claim 12 wherein each node includes a media access controller, a memory and a logic processor.

14. The system of claim 13 wherein each node is connected to a component in a plant.

15. The system of claim 14 wherein one of the intermediate nodes of the first chain of nodes is connected to a servo control device.

16. The system of claim 12 comprising a second chain of nodes connected by a network, the second chain of nodes including the first terminus end node, a third terminus end node and a plurality of intermediate nodes between the first terminus end node and the third terminus end node.

17. The system of claim 16 wherein the first terminus end node includes a switch for transferring data from the first chain of nodes to the second chain of nodes.

18. The system of claim 12 wherein the first terminus end node is configured to transmit an enumeration data packet to the second terminus end node through the intermediate nodes and back to the first terminus end node to provide an initial node value to each node of the first chain of nodes.

19. The system of claim 12 wherein each node includes a countdown timer that is configured to be activated by the synchronous data stream to enable the node to act synchronously with other nodes in the first chain of nodes.

20. A system for a distributed control, data acquisition and data distribution of an industrial plant having a plurality of actuators and transducers for controlling and monitoring aspects of the plant comprising:

a first chain of networked nodes having a first terminus end node, a plurality of intermediate nodes and a second terminus end node, wherein the first terminus end node is configured to generate a first synchronous packet stream for transmission from the first terminus end node to the second terminus end node and back to the first terminus end node, and wherein each node is coupled to one of an actuator and a transducer in the industrial plant and is configured to one of remove one or more packets of data from and add one or more packets of data to the first synchronous data stream at a determined synchronous time interval, wherein the data moved to and from the first synchronous data stream relates to one of monitoring and controlling the one of an actuator and a transducer coupled to the nodes of the first chain of nodes;

a second chain of networked nodes having the first terminus end node from the first chain of nodes, a plurality of intermediate nodes and a third terminus end node, wherein the first terminus end node is configured to generate a second synchronous packet stream for transmission from the first terminus end node to the third terminus end node and back to the first terminus end node, and wherein each node in the second chain of nodes is configured to one of remove one or more packets of data from and add one or more packets of data to the second synchronous data stream;

a first clock for providing a base clock pulse to the first chain of nodes and a derived clock pulse to the second chain of nodes.