Programmable logic control method based on on site bus communication

A programming logic control and field bus technology, applied in the direction of electrical program control, sequence/logic controller program control, etc., can solve the problems of many cables, high engineering implementation intensity, high cost, etc., and achieve easy expansion and convenient concurrent access Easy to implement, logical configuration and intuitive effect

Active Publication Date: 2008-09-17
BEIJING SIFANG JIBAO AUTOMATION +1
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Problems solved by technology

[0002] In many industrial control fields, the I / O data of the programmable logic controller (PLC) is completed based on hard wiring, that is, data acquisition and control commands are passed through separately laid cables and local I / O control units. The problems brought about by the connection are: many cables to be laid, high cost, and high project implementation intensity

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  • Programmable logic control method based on on site bus communication
  • Programmable logic control method based on on site bus communication
  • Programmable logic control method based on on site bus communication

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Embodiment Construction

[0030] The technical solution of the present invention will be further described in detail below through specific embodiments according to the accompanying drawings in the description.

[0031] The technical scheme of the present invention is as follows: based on the programmable logic control method of field bus communication, the local control unit communicates with the DPU (logic controller) through the field bus to realize the collection of local I / O data and the control output of electrical logic, Its characteristics are:

[0032] In the logic configuration graphic tool PLE, the control program is written in the function block language to realize the logic algorithm;

[0033] After compiling (automatically producing scanning sequence) and downloading, the logic algorithm runs in the logic controller program dpu as an independent task;

[0034] The data collected by the local equipment unit is transmitted to the DPU through the bus, and the collected data is stored in the...

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Abstract

The invention relates to a programmable logical control system based on field bus communicating in a power plant distributed electric control system, discloses an implementing method of the following kernel components of the control system, including an implementing method of I/O drive, with the introduction of the I/O drive, the logical controller is convenient for concurrent accessing of a plurality of data source, and the opening and flexibility of the logical data accessing is increased; a scanning algorithm of a PLE functional block, which automatically generate scanning algorithm of a functional block, does not need artificial setting, and is suitable for tree network and ring network; a logical function block is designed based on the logical function block of the electric control system in combination with electric control features of the power plant; a logical configuration manner based on I/O point overcomes limitations of the traditional logic configuration, the entire configuration process is still more visual and readable, and the data global sharing and quality participating arithmetic is furthermore convenient. The system flexibility and application can be effectively improved by using these methods.

Description

technical field [0001] The invention relates to the field of industrial control, and more specifically to a method for realizing power logic of a power plant. Background technique [0002] In many industrial control fields, the I / O data of the programmable logic controller (PLC) is completed based on hard wiring, that is, data acquisition and control commands are passed through separately laid cables and local I / O control units. The problems that it brings are: many cables to be laid, high cost, and high project implementation intensity. [0003] With the maturity of industrial control bus technology, it has been gradually applied to the field of industrial control. Programmable logic controllers based on communication technologies such as fieldbus and industrial Ethernet can save a lot of hard wiring, transmitters and other hardware devices, and significantly reduce engineering costs. For example, in the electricity system of a power plant, the on-site intelligent equipme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/05
Inventor 何振同刘刚焦邵华陈莉王海燕朱磊
Owner BEIJING SIFANG JIBAO AUTOMATION
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