A Real-Time Execution Scheduling Method of Ethernet System Function Blocks

Abstract

The present invention provides a real-time execution scheduling method of Ethernet system function blocks, said method comprising: dividing the communication macrocycle T of each EPA device into two parts: a communication time slice and a function time slice; A timer that updates the real-time setting value of the timer according to the start time of the communication time slice and the function time slice. When the timer is triggered, obtain the local current time and judge the current time slice: transmit periodic messages within the communication time slice With aperiodic messages, it receives and processes aperiodic messages and executes functional tasks within the functional time slice. The real-time execution scheduling method of the Ethernet system function block in the present invention has the characteristics of high transmission efficiency, strong system performance, low system calculation load and communication load, good system operation efficiency and real-time communication performance, 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 ...

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 be processed

[0004] It can be seen that in the prior art, the function block execution scheduling problem leads to invalid execution of function blocks and invalid data transmission, which increases the calculation load and communication load of the system, and seriously reduces the system performance.

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