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Distributed control system and method based on time-event mixed driven

A distributed control and hybrid drive technology, applied in the computer field, can solve problems such as low execution efficiency, inability to meet the real-time requirements of distributed control systems, and increased uncertainty in the execution mode of the controller, so as to reduce network delay and improve Execution efficiency, the effect of reducing execution time

Active Publication Date: 2019-03-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is that the programmable logic controller adopting the polling calculation model in the existing industrial automation system has low execution efficiency; the message mechanism will be affected by the network, causing The communication between multiple controllers cannot be synchronized, and the uncertainty of the execution mode of the controllers increases, which cannot meet the real-time requirements of the distributed control system

Method used

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Embodiment 1

[0045] Such as figure 1 with figure 2 As shown, the present invention provides a distributed control system based on time and event hybrid drive including two programmable logic controllers; the connection between the programmable logic controllers is a parallel connection; the programmable logic controllers include program blocks, Event buffer pool, clock; program blocks include function blocks, event source function blocks, and end point function blocks; event source function blocks are configured to create events, function blocks are configured to process events, and end point function blocks are configured to logout events; function blocks It includes function user code module, function input terminal and function output terminal; event source function block includes source user code module and source output terminal; terminal function block includes terminal user code module and terminal input terminal; the program block can use IEC 61131- 3 or IEC 61499 modular encapsu...

Embodiment 2

[0069] On the basis of Embodiment 1, the distributed control system and method based on time and event hybrid drive provided by the present invention can be applied to a single programmable logic controller.

Embodiment 3

[0071] On the basis of Embodiment 1, the method of reordering all events in the event buffer pool in step 2.9 is to sort according to the order of the latest execution completion time, and the event with the latest execution completion time is prioritized. When the latest execution completion time When the time is the same, the events are sorted according to the priority of the event, and the event with the higher priority takes priority.

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Abstract

The invention discloses a distributed control system and a method based on time-event mixed driven, and relates to the field of computers. The distributed control system comprises a programmable logiccontroller. The programmable logic controller comprises a program block, an event cache pool and a clock. The program block comprises a function block, an event source function block and an end pointfunction block. The function block comprises a function user code module, a function input end and a function output end. The event source function block comprises a source user code module and a source output end. The end point function block comprises an end point user code module and an end point input end. Associated modules of the programmable logic controller is connected through an event.The distributed control method based on time-event mixed driven adopts the distributed control system. Through the implementation of the invention, the influence caused by different hardware performances can be eliminated, the execution efficiency can be greatly improved, and the instantaneity and accuracy of task completion can be ensured.

Description

technical field [0001] The invention relates to the field of computers, in particular to a distributed control system and method based on time and event hybrid driving. Background technique [0002] The programmable logic controller in the existing industrial automation system uses a polling computing model, that is, each programmable logic controller performs centralized batch processing in the order of reading sensor input data, executing all user programs, and refreshing actuator output. User programs are stored in the form of modules, and the code reuse rate and execution efficiency are improved through a unified interface. The polling control method completes the execution of all programs within the specified time. When the execution task cannot be completed within the specified polling period, the controller will issue a timeout alarm. When there are multiple programmable logic controllers in the distributed control system, the controllers are connected through a mess...

Claims

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Application Information

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IPC IPC(8): G05B19/418G05B19/05
CPCG05B19/052G05B19/418G05B19/4183Y02P90/02
Inventor 戴文斌关新平
Owner SHANGHAI JIAO TONG UNIV