Real-time execution scheduling method of functional blocks of Ethernet system

A system function, real-time execution technology, applied in transmission systems, digital transmission systems, data exchange networks, etc., can solve problems such as old data not being processed, increasing system computing load and communication load, and inability to transmit, to improve operation. Efficiency and real-time performance of communication, avoidance of invalid execution and effects of reducing communication load and computational load

Inactive Publication Date: 2016-11-09
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the communication time slice is not up, these messages cannot be transmitted in the sending queue; and when the communication time slice arrives, these messages are transmitted to the same destination function block in turn, so that the old data is overwritten by the new data and cannot b...

Method used

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  • Real-time execution scheduling method of functional blocks of Ethernet system
  • Real-time execution scheduling method of functional blocks of Ethernet system
  • Real-time execution scheduling method of functional blocks of Ethernet system

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Experimental program
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Embodiment

[0063] image 3 It is a schematic diagram of the composition and structure of the EPA real-time Ethernet system in the embodiment. Such as image 3 As shown, the EPA real-time Ethernet system described in this embodiment includes 1 PC, 1 EPA network bridge, 1 Ethernet switch and 4 EPA devices that have realized the method of the present invention; these 4 EPA devices are referred to as equipment 1. Device 2, Device 3, Device 4.

[0064] Figure 4 It is a schematic diagram of the composition and structure of the control loop formed by the functional blocks in each device in the embodiment. Such as Figure 4As shown, there are 6 function blocks FB1-FB6 in devices 1-4, totaling 24 function blocks. These 24 functional blocks belong to 3 control loops respectively, and each control loop is separated by a dotted line frame; among them, the solid line frame is used to separate 4 EPA devices.

[0065] In this embodiment, the messages sent by each device are: device 1 sends 2 mes...

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Abstract

The invention provides a real-time execution scheduling method of functional blocks of an Ethernet system. The method comprises the steps of: dividing a communication macro cycle of each EPA device into two parts including a communication time slice and a function time slice; setting one timer in each device, updating a real-time set value of the timer according to a starting time of the communication time slice and the function time slice, when the timer is triggered, acquiring a local current time, and judging the current time slice; transmitting a cyclic message and an acyclic message within the communication time slice, and receiving and processing the acyclic message and executing function tasks within the function time slice. The real-time execution scheduling method of the functional blocks of the Ethernet system, provided by the invention, has the characteristics of high transmission efficiency, high system performance, low system calculation load and communication load, good system operating efficiency and communication real-time performance, and so on, and can be widely used in the field of industrial control.

Description

technical field [0001] The invention relates to an execution scheduling technology, in particular to a real-time execution scheduling method of an Ethernet system function block. Background technique [0002] EPA (Ethernet for Plant Automation) factory automation Ethernet is a control system-oriented real-time Ethernet technology independently developed by China, which has been included in the fieldbus international standard IEC61158 and the real-time Ethernet international standard IEC61784. At present, EPA has been widely used in electric power, chemical industry, machinery, mining, petroleum and other fields. [0003] As a network control system, EPA realizes the distributed measurement and control under the network environment by delegating the control function to the function block of the field device. In the EPA system, multiple functional blocks distributed in different EPA devices form a control loop, and each functional block is connected to each other through EPA ...

Claims

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Application Information

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IPC IPC(8): H04L12/875H04L12/863H04L47/56
CPCH04L47/568H04L47/625
Inventor 刘宁吕鲲吴雪峰罗晨旭林琳
Owner HENAN POLYTECHNIC UNIV
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