Method for determining realtime Ethernet tlecommunication

A communication method and technology of Ethernet, applied in the field of real-time Ethernet deterministic communication, to achieve the effect of reducing complexity, high flexibility, transmission delay and small jitter

Active Publication Date: 2007-11-21
MICROCYBER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the technology of using a distributed-centralized combination of bus arbitration.

Method used

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  • Method for determining realtime Ethernet tlecommunication
  • Method for determining realtime Ethernet tlecommunication
  • Method for determining realtime Ethernet tlecommunication

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] As shown in Figure 1, in a control network, including the only master device and several slave devices, the topology of the network can include bus linearity, star and ring, and it can be connected in a wireless or wired way through a dedicated gateway device To the Internet and can be accessed by other computers to achieve remote monitoring.

[0062] As shown in Figure 2-6 and 9, a communication scheduling layer is added on the data link layer of the original seven-layer structure of Ethernet for unified scheduling of data transmission; compared with the standard channel using the TCP\IP protocol, a real-time channel is added , for the transmission of real-time application data in a custom package format; determine the value of the macrocycle according to the greatest common divisor of the control cycle in the actual control area, and divide the macrocycle into three time periods on the time axis using the three-segment division principle ; The arbitration of the bus a...

Embodiment 2

[0100] The difference from Embodiment 1 is that when the master device in the present invention sends a token message, it only uses flow control, priority fine-tuning or timeout avoidance method to adjust the sending of the aperiodic data message from the slave device, to optimize overall performance.

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Abstract

The method comprises: newly adding a communication scheduling layer into original data link layer of Ethernet; in relation to the standard channel using TCP/IP, newly adding a real time channel; according to the greatest common divisor of control cycle in the actual control area, using a three segmentation dividing principal to divide macro cycle into three time segmentations on time axis; the bus arbitration uses a approach of combining the distribution with the concentration, and uses a time slot distribution based scheduling approach to send the cyclic data relating to the realization of control function in the time segmentation, uses the centralized scheduling approach with priority controlling function to send the system data and non cyclic data in the time segmentation; all slave devices in the system keep the time consistence with the master device by using a clock synchronous algorithm; the logic addressing is made based on the device ID; realizing the real time Ethernet determinacy communication.

Description

technical field [0001] The invention relates to the field of automatic control, computer network and real-time communication technology, and specifically proposes a real-time Ethernet deterministic communication method. Background technique [0002] Distributed control is an inevitable trend in the development of industrial computer control systems. In the 1990s, distributed control systems (Distributed Control System, DCS) became the preferred equipment for industrial monitoring systems. After the field bus is applied to the field of industrial control, it has created a new situation in the development of industrial control network. Fieldbus changes the communication network used by DCS from a closed and dedicated solution to an open and standardized solution, and at the same time transforms the DCS distributed control structure that combines centralization and decentralization into a new type of fully distributed structure. Fieldbus data communication has high reliability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04L12/403H04L12/407
Inventor 徐皑冬赵伟刘明哲周侗
Owner MICROCYBER CORP
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