The control scale and complexity of the process control system

1. According to the control scale and complexity of the process control system

For different metallurgical production processes, the control scale and complexity of the process control system are different. Usually, DCS is preferred when the process control system is large in scale and high in complexity. Because the system is developed according to the characteristics of the process control system, it can better process, analyze, and calculate a large amount of analog data information, and can complete various complex and cumbersome adjustment and control calculations, so it can complete large-scale work with large and complex process control systems. In 1995, in the CDQ project design of Jinan Iron and Steel Co., Ltd., (Allen Bradley 1756-PB75R Redundant Power Supply,  B&R Br X20bc0083 Bus Controller Ethernet Powerlink,Siemens 6ES7331-7RD00-0AB0 Analog Input Module,Siemens 6ES7350-1AH03-0AE0 SIMATIC S7-300 Counter Module)according to this principle, the process control system adopted Japan Yokogawa μXL DCS and achieved good results. 

2. Reasonable selection according to investment scale and project economic efficiency

In some small and medium-sized metallurgical projects, especially small and medium-sized transformation projects, the investment is small, and the PLC system with relatively low price and good cost performance should be preferred for small-scale instrument and control systems. For example, in 1991, in the design of projects such as the transformation project of the secondary cooling water distribution project of the No. 3 slab continuous casting machine of Jinan Iron and Steel Co., Ltd. and the transformation project of the heating furnace of the medium plate factory, Texas Instruments (USA) was selected in the process control system according to this principle. The TI-545 series PLC system produced by TI) has also achieved good results. 

Merry Christmas to those who enjoy it, WE WISH YOU HAPPY

and we will offer discount during Merry Xmas holiday.

Vivi (sh_plc@163.com).  

The low-pass filter can absorb most of the " burrs " of the power supply . L1 and L2 in the figure are used to suppress high-frequency differential mode voltage . L1 and L2 are reversely wound on the same magnetic ring with equal-length wires , 50HZ The magnetic fluxes generated by the power frequency current in the magnetic ring cancel each other out, and the magnetic ring will not be saturated. 

The magnetic flux generated by the common mode interference current in the two lines is superimposed in this ring, and the common mode interference is blocked by L3 and L4. In the figure, C1 and C2 are used to filter out the common mode interference voltage, and C3 is used to filter Differential mode interference voltage. 

R is a varistor, and its breakdown voltage is slightly higher than the highest voltage of the normal operation of the power supply, which is usually quite open.(Allen Bradley 1756-L71S GuardLogix Controller, Siemens 6ES7134-4GB01-0AB0 ET200S Electronics Module,B&R X20CP1585 CPU New,  Allen Bradley 1734-EP24DC Expansion Power Supply ) When it encounters a spike interference pulse, it is broken down, and the interference voltage is clamped by the varistor. At this time, the terminal voltage of the varistor is equal to its breakdown voltage.

The high-frequency interference signal is not transmitted through the coupling of the transformer windings, but through the distributed capacitance between the primary and secondary windings. Adding a shielding layer between the primary and secondary windings and grounding it together with the iron core can reduce the distributed capacitance between the windings and improve the ability to resist high-frequency interference.

Power filter products can also be used, such as the power filter of Beijing Zhongshi Company, which has good common mode filter, differential mode filter performance and high-frequency interference suppression performance, and can effectively suppress the line-to-line and line-to -ground. interference, its products can be used for AC single-phase, three-phase power and DC power. C/D series high-performance filters are suitable for electronic equipment with transient

The interested persons of mentioned parts may relate with me, price liberally. --

Vivi (sh_plc@163.com).   

The working principle of the system

The body of the volumetric tube is a closed volumetric standard made of steel pipes. Its basic volume value refers to the volume of the pipe section between the start detection switch D1 and the end detection switch D2. The volume value is measured by the authorized unit of the State Bureau of Technical Supervision in accordance with the national verification regulations JJG209, and converted to the standard state (20 ℃, 101325Pa) volume value.

During calibration, the flowmeter to be tested and the volumetric tube are connected to form a calibration system through process switching. The PLC of the control system controls the start and stop of the calibration system through the switch module, and uses the high-speed counting module to collect the standard volume value of the volume tube and the number of pulses sent by the flowmeter flowmeter under test, and convert it into the volume value under the standard state. (Siemens 6ES7307-1EA01-0AA0 Power Supply Module, B&R X20BM31 Bus Module, Allen Bradley 1747-L543 SLC 500 Processor)After that, the control system compares and calculates the volume value with the standard volume value of the volume tube to obtain the measurement accuracy of the tested flowmeter. If the accuracy meets the specification requirements, the flowmeter will be put into the normal production process; if there is an out-of-tolerance, it will be calibrated after calibration.

The interested persons of mentioned parts may relate with me, price liberally. --

Vivi (sh_plc@163.com).   

What communication modules are available from LOGO!

Communication Module (CM) AS-i, which is described in more detail in a separate document. This communication module has four virtual inputs and outputs and acts as an interface between the AS-i interface system and the LOGO!

The LOGO! communication module (CM) EIB/KNX, which is described in more detail in a separate document, is a communication module that connects LOGO! modules to the EIB bus and implements the function as a slave of the logic module LOGO!

CM/ EIB/KNX is a bus device on the EIB bus that enables LOGO! to communicate with other EIB devices by means of data exchange of EIB data points. It transfers EIB data points to LOGO! and LOGO! functions to EIB. CM EIB/KNX makes the current status of the configured data points available to LOGO! and thus links the logic functions and timing elements of the latter. In addition, EIB data points can be linked to local LOGO! and the CMEIB/KNX module transmits every change in the status of the output signals on the EIB bus.

The combination of LOGO! and the CM EIB/KNX module communication provides the user with the ability to run a distributed controller on the EIB bus, allowing parameters and logic operations to be set or modified quickly and easily without the need to program devices.

Advantages of LOGO!

LOGO! is a universal logic control module from SIEMENS (Allen Bradley 1794-OB16P I/O Output Module, Allen Bradley 1794-IB32 Flex Input Module, B&R X20BM111 Bus Module) that is the best choice for you because of its flexibility and low cost of ownership.

LOGO! is a truly future-proof technology. It has now been developed into a standard component product and is therefore easier and more complete than ever before.

LOGO! is now available in two versions: the basic LOGO! and the economic LOGO! Together with a wide range of extension modules, LOGO! has in fact become a mature technology that covers all aspects, it is ubiquitous and versatile!

With 8 basic functions and 26 special functions, LOGO! LOGO! modules are easy to install and require virtually no wiring. LOGO! is also vibration-resistant, has a high level of electromagnetic compatibility (EMC) and is fully compliant with all industrial standards and can be used in all climatic conditions. LOGO! is therefore widely used throughout the world.

You can ignore all individual components such as time relays, counters and intermediate relays, contactors, as they are all included in LOGO! 

Have interest in above parts? get in touch with Vivi (sh_plc@163.com).   

Working Principle of Totally Enclosed Weighing Coal Feeder - Chapter 2

At the same time, 4-20mA current signal proportional to the flow is output to the built-in software PID regulator of the weighing controller. The regulator performs self-tuning operation according to the parameters set by the user, and outputs the control current to the frequency converter controller to change the coal feeding amount. By adjusting the rotation speed of the machine motor, the coal feeding amount can be changed to achieve the purpose of regulation. This cycle forms a low-level closed-loop control system, which is adjusted repeatedly and maintains the optimal control state.

The weighing controller(Allen Bradley 1769-IQ16 Compact I/O Module, B&R X20CM0985 Energy Measurement And Synchronization Module, ABB FS225R12KE3/AGDR-61C IBGT Module) (or frequency converter) can also receive the 4-20mA current control signal sent by the upper layer (DCS) system, and compare the instantaneous coal feeding signal with the coal feeding signal required by the boiler combustion control system; According to the comparison results, the frequency converter is used to change the speed of the main motor, so that the actual coal supply is the same as the required coal supply to meet the needs of the boiler combustion system. The upper system can also set various parameters of the instrument through RS485 communication port, including belt scale calibration, flow setting and other operations.

Have interest in above parts? get in touch with Vivi (sh_plc@163.com). 

Malaysia attracts us $27.5 billion in investment in the first half of 2022

The service industry played an important role in promoting the national economic recovery, accounting for 63.3% of the total approved investment with 78 billion ringgit (17.4 billion US dollars), followed by the manufacturing industry with 43.1 billion ringgit (9.6 billion US dollars) and the primary sector with 2.2 billion ringgit (491 million US dollars).

In maintaining this momentum, he added that his department will continue to work to strengthen the competitiveness of the country, develop the complexity of the economy, (B&R X20BM111 Bus Module, Allen Bradley 1756-OW161 Output Module,Siemens 6AV2123-2MB03-0AX0 Panel)foster a strong industrial ecosystem with innovation, strengthen inclusiveness, create high-income employment opportunities, and promote opportunities to participate in regional and global supply chains.

To get  part,get in touch with Vivi (sh_plc@163.com).

The G20 climate talks held in Indonesia failed to reach a communique

At the beginning of the meeting, Indonesian Environment Minister Siti nurbaya Bakar urged all countries to reduce emissions and prevent the earth from being pushed to the point that "there is no future sustainable".(B&R X20DO9322 I/O Module, Allen Bradley Sst-Pb3-Clx Profibus Scanner Module, Siemens 3RV1021-1FA10 Circuit Breaker)

On the occasion of the G20 climate conference hosted by Indonesia, this year's chair, extreme weather events -- fires, floods and heatwaves -- have hit many regions of the world, including the unprecedented floods in Pakistan in recent weeks, which have killed at least 1000 people.

"The current energy crisis shows that countries that rely on fossil fuels controlled by hostile forces are vulnerable," he said in a statement on Tuesday.

"Climate security has become a synonym for energy security, and the long-term threat of climate change will not disappear," 

To iindustrial instruments ,get in touch with Vivi (sh_plc@163.com).

The G20 has gathered to discuss carbon emissions. Negotiation is not easy

This group of 20 countries accounts for about 75% of the world's total greenhouse gas emissions. In 2021, the group recognized that limiting global warming to 1.5 degrees Celsius above pre industrial levels required "meaningful and effective" steps.

Russia is one of the G20 countries. This month, Sky News and other reports said that Russia was burning natural gas that would normally be exported to Europe. According to Indonesia, the host country of the G20, Russian President Vladimir Putin will attend the leaders' meeting scheduled for November.

"There is also a huge energy crisis(B&R X20DC2396 Controller Counter Module, Siemens 3RW4046-1BB14 SIRIUS Soft Starter, Allen Bradley 1747-L532 SLC 500 Controller), prices are high all over the world, and people are struggling to pay for energy. And this is also... Not conducive to climate action, because many countries are starting to use fossil fuels again," jayten said.

"We need to strengthen our game. All these extreme weather events around the world - in Europe, the Asia Pacific, but also in the Americas, [are] our real alarm bells. For everyone, we must take action now," Dutch Minister jetten said.

To get more parts,get in touch with Vivi (sh_plc@163.com).

Qingming Festival (Tomb Sweeping Festival) is one of the traditional festivals in China, usually between the 4th and

6th of April each year, and is an important day for paying respect to ancestors and for prudent thinking and respect

for relatives. On this day, people visit the graves of their ancestors to pay their respects, offer flowers, offer incense and

sweep their tombs to express their remembrance and respect for their ancestors.

The Qingming Festival has its origins in ancient China, dating back to the Spring and Autumn Period, and is a very

ancient festival. During the Qingming Festival, people also hold a number of activities related to folk culture, such as

flying kites, treading on greenery and stilt walking, as well as eating special foods such as Qingming porridge and

steamed dumplings.

The Qingming Festival is one of the traditional cultural heritages of the Chinese nation, with profound cultural conno-

tations and historical values. In modern society, with the improvement of living standards and urbanisation, people are

paying more attention and importance to the traditional culture and values of the Qingming Festival.

In addition, the Qingming Festival is also a festival that focuses on environmental protection and ecological construction.

While people pay tribute to their ancestors, they also pay attention to the environmental hygiene and protection of ceme-

teries, as well as the protection and greening of the natural environment. Through this festival, the Qingming Festival can

promote the inheritance and development of society and culture, as well as remind people to treasure natural resources,

go green and build a beautiful home together

In China, we had a day off in Tomb Sweeping Day, but now we get back to work, if clients need below parts, feel free to

contact us:  Vivi (sh_plc@163.com).   

B&R X20Al4622 Analog Input Module

Siemens 6ES7315-2EH14-0AB0 SIMATIC S7-300 CPU 315 Central Processing Unit

Allen Bradley 2711-K5A1 Panelview 550 Operator Terminal

Siemens 6ES7315-2AF02-0AB0 SIMATIC S7-300 CPU

A power plant, 2×300MW coal-fired units

The thermal system is a unit system . Each unit is equipped with a centralized control building, which adopts the centralized

control mode of machine , furnace and electric unit . The elevation of the unit control room is 12.6m, which is consistent with

the elevation of the operation floor . DCS adopts WDPF-Ⅱ, and the I/O points designed for each unit are 4500 points.

The number and length of the above cables do not include the factory-supplied cables for the fire alarm of the whole plant 

and the cables of the auxiliary production workshops of the whole plant .

The cables of the power station can be divided into six categories :

High-voltage power cables , low-voltage power cables , control cables , thermal control cables , weak current cables

(mainly refers to computer cables ), and other cables . If two 300MW units do cable laying at the same time, the number of

professional automation cables will be about 8,500 . Among them, there will be more than 500 thermal control cables and

weak current cables, accounting for about 60% ( measured by the number of cables ).

B&R X20BR9300 X2X Link Bus Receiver, Allen Bradley 1769-PA2 CompactLogix Power Supply, Siemens 6ES7443-1EX30

-0XE1 Based On 6AG1443-1EX30-4XE0 Communication Module, B&R X20DO2649 Digital Output Module

Have interest in above parts? get in touch with Vivi (sh_plc@163.com).