1. Configuration of the control loop
The configuration of the control loop is essentially to use the various basic functional modules provided by the system to form a variety of actual control systems. At present, the configuration methods provided by different DCSs are different, which can be summarized as specifying the connection mode of the operation module, the method of decision table, the method of recording steps, and so on.
The specified operation module connection mode is to call a variety of independent standard operation modules, connect into a variety of control loops with lines, and finally automatically generate control software, which is a configuration method with intuitive information flow and control functions. The decision form is a pure form of filling in the form, as long as you fill in the content or answer the questions one by one according to the requirements of the configuration form, which is very conducive to the user's configuration operation. The step entry method is a kind of writing method based on language instructions, with a large degree of programming freedom, and various complex functions can be realized through some skills, but the configuration efficiency is low. In addition, because this configuration method is not intuitive enough, it often has high requirements for the technical level and configuration experience of the configuration engineer.
2. Real-time database generation
The real-time database is the most basic information resource of DCS, and these real-time data are stored and managed by the real-time database. In DCS, there are many ways to establish and modify real-time database records, and the common method is to use the general database tool software to generate database files, and the system directly uses this data format for management or adopts a certain method to convert the generated data files into the format required by DCS.
3. Generation of industrial process screens
DCS is an integrated control system, which must have a rich control system and detection system screen display functions. Obviously, different control systems need to display different screens. In general, it is a basic requirement of DCS configuration to represent various measurement and control parameters and system status in appropriate forms such as characters, bar diagrams, curves, etc., combined with the overall picture, grouping, control loop, flow chart, alarm and other screens. In addition, various variable catalog screens, operation guidance screens, fault diagnosis screens, engineer maintenance screens, and system configuration screens can be displayed as required.
4. Generation of historical database
All DCSs support historical data storage and trend display functions, and the historical database is usually generated by the user without programming, through the screen editing compilation technology, a data file that defines the structure and scope of each historical data record. The data in the historical database is generally divided into groups, and the data type and sampling time within each group are the same. Information about each data point is defined at the time of generation.
5. Report generation
The report printing function of the operator station of the DCS is also configured through the report generation part in the configuration software, and there are great differences in the report printing function of different DCS. Generally speaking, DCS supports the following two types of report printing functions: one is periodic report printing, and the other is triggered report printing, and users can generate different report formats according to their needs and preferences.
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On October 18, 2022, the China Intelligent Transportation Association released the list of winners of the "2022 China Intelligent Transportation Association Science and Technology Award", which includes the Science and Technology Progress Award, the Technology Invention Award, and the Outstanding Innovative Talent Award. Among them, Beijing Hollysys System Engineering Co., Ltd. ...
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According to the different functions of PLC, PLC can be divided into three categories: low-grade, mid-range and high-end.
(1) Low-grade PLC
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How a PLC controller works
1. Scanning technology
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Hollysys PLC - PLC is classified by function
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(1) Low-grade PLC
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Hollysys PLC - what are the application fields of PLC
1. Logic control of switching quantity
This is the most basic and most extensive application field of PLC, which replaces the traditional relay circuit to achieve logic control and sequence control, which can be used for the control of a single device, as well as for multi-machine group control and automatic assembly line. Such as injection molding machines, printing machines, ...
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Hollysys DCS - What are the specific contents of the major and minor repair projects of the DCS system?
(1) Overhaul projects
DCS system overhaul is carried out in the random group of main equipment overhaul, and the overhaul project includes the following:
1) Conduct a comprehensive inspection of the control equipment and make a record.
2) Copy the configuration of all modules, and verify the marks and addresses of the modules.
3) Qing ...
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Hollysys PLC - the isolation technology of the input/output loop of the PLC control system
1. Circuit isolation
The isolation of analog circuits is more complex, mainly depends on the accuracy requirements of the transmission channel, the higher the accuracy requirements, the higher the cost of the channel; However, when the performance requirements rise to the main contradiction, the isolation components should be selected based on performance, and the ...
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Hollysys PLC - PLC should be noted in operation (three, four, five)
3. Main anti-interference measures
(1) Reasonable treatment of power supply to suppress the interference introduced by the power grid
For grid disturbances introduced by the power supply, an isolation transformer with a shielded ratio of 1:1 can be installed to reduce the interference between the equipment and the ground.
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Hollysys DCS - the development trend of DCS
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(2) To the intelligent ...
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Hollysys OCS industrial optical bus control system was successfully applied in Sinopec project
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Hollysys attended the 2021 China Software Industry Annual Conference
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2. Strong electrical interference (external)
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Hollysys PLC - the working principle of PLC controller
1. Scanning technology
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Hollysys DCS - What are the characteristics of DCS?
1. High reliability
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Hollysys assisted the successful construction and operation of the largest natural gas deep processing base in Xinjiang
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1. Peripheral circuit component failure
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Hollysys DCS output module - K-AO02 advantages introduced
1. The output accuracy is as high as 0.05%, which greatly improves the operation efficiency of the system.
2. The full-scale output of the channel signal is 0-22.7mA, and the output range is wide;
3. It can be adapted to the enhanced base to achieve channel resistance to 220VAC;
4. It has a perfect channel signal diagnosis function, which can be realized.
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