Consider the technical serviceability of the system manufacturer

At present, in China's PLC system and DCS sales market, foreign manufacturers have a large share. Major foreign manufacturers are generally in China's high-energy product promotion and technical service agencies, while foreign companies often undergo reorganization, mergers or mergers. The structure, sales strategy, and market share direction are all different. After the merger or merger, there will be changes in the technical promotion and services in the Chinese market, some will be strengthened and some will be weakened. Therefore, when we choose a system, we should Fully grasp the information and consider the technical serviceability of the system manufacturer to protect the advancement and development of the selected system and ensure sufficient technical support and spare parts supply.

B&R X20PS9400 Power Supply Module,  Siemens 6ES7361-3CA01-0AA0 SIMATIC S7-300 Interface Module, B&R X20PS4951 Power Supply, Siemens 6ES7365-0BA01-0AA0 SIMATIC S7-300 Interface Module

To sum up, the principles of system selection can be considered from the following aspects: system scale, complex procedures, system integrity and communication performance, as well as manufacturer technical support and after-sales service. In the metallurgical production process control system, it is of great significance to ensure the automation level of the production process control system and reduce the project cost according to the complexity of the process objects and the reasonable selection of different control systems for the reliability of the control system.

The interested persons of mentioned parts may relate with me, price liberally. -- Vivi (sh_plc@163.com).  

It is 2023 now. I wish you a happy new year 2023

Looking back on 2022, we have experienced a lot, though there`s some losses, but more gains.

I sincerely wish every customer more gains in 2023.

Thank every customer for their preference for our products and their trust and support for our company in 2022.

We hope that in 2023 we can continue to strengthen cooperation.

2023, let's join hands to create happy and healthy wealth, thank you.

2023, if any RFQ Siemens 6ES7153-1AA03-0XB0 SIMATIC DP Connection Modules , pls contact with Vivi (sh_plc@163.com).  

How the system working

Use a volumetric tube to calibrate the flowmeter. In order to accurately reflect the repeatability of the meter at each flow point, according to the national standard GB/T13282, the basic volume of the volumetric tube should be selected according to the following principles: 

In the formula: VQ——basic volume design value (m 3 ); Qmax——upper limit value of the tested flowmeter (m 3 /h);like below

ProSoft MVI56E-MNET Modbus TCP/IP Interface Module，Siemens 6ES7332-7ND02-0AB0 SIMATIC S7-300 Analog Output Module, Allen Bradley 1761-NET-AIC Advanced Interface Converter, Siemens 6ES7340-1AH02-0AE0 SIMATIC S7-300 Communications Processor

As long as this principle is met, the running speed of the elastic ball can be guaranteed to be less than 3 m/s, and the more economical running is within the safe speed range.

In order to ensure the reliability of the calibration, before the official calibration, the tightness test of the volume tube system should be carried out: first conduct the test process, and then the control system starts the booster pump to pressurize the volume tube system to maintain the pressure in the volume tube If the pressure before the inlet valve is 0.5 MPa, observe for 30 minutes. If the pressure drop is less than 0.2 MPa, calibration can be carried out.

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

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.

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Processing of power supply by PLC 

Power supply is one of the main ways for interference to enter the programmable controller. Power supply interference is mainly generated by impedance coupling of power supply lines, and various high-power electrical equipment is the main source of interference.

In situations with strong interference or high reliability requirements. A shielded isolation transformer and a low-pass filter can be added to the AC power input( Allen Bradley 1794-IB16 Flex Input Module, B&R X20BM05 Bus Module, Siemens 6ES7132-4BD02-0AA0 ET 200S Electronic Module,  Allen Bradley 1734-OB8 Output Module) end of the programmable controller (see Figure 1). The isolation transformer can prevent external interference from the power line. To improve the ability to resist high frequency common mode interference, the shielding layer should be grounded reliably.

he external DC power supply for the external input circuit should preferably be a stable power supply. The power supply that only rectifies and filters the AC voltage contains strong ripples, which may cause the programmable controller to receive wrong information.

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

Vivi (sh_plc@163.com).

Programmable Controller Periodic Maintenance

As a kind of industrial control equipment, programmable logic controller(Allen Bradley 1756-PA72 ControlLogix, Allen Bradley 1756-RM Enhanced Redundancy Module, B&R X20CP1584 CPU, Allen Bradley 1756-L61 ControlLogix Controller) is widely used in all walks of life due to its high reliability. However, due to the working environment and other peripheral equipment and some problems of its own, it takes time every six months to one year. Regular inspection and maintenance of the PLC system to ensure the normal operation of the system. The specific inspection items, content and PLC requirements are shown in the table below.

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Reasons for ammonia blocking denitration spray gun-chapter 2

Ammonia blocking the spray gun may be caused by the following reasons

Phenomenon: One is left or right.

Reason for.

A. The fan control hole on the side of the air cap is blocked

B. The air cap is damaged. When using ammonia spray gun, it is necessary to spray corrosive reducing agent to the area between 850 ℃ and 1050 ℃ in the boiler furnace, so it is necessary to use corrosion-resistant and high-temperature materials.

Solution.

A. Clean atomizing cap

B. Replace the atomizing cap.

Phenomenon 2: the center of spraying amplitude is too thick. The processes of SCR and SNCR denitrification systems are not very different, except that the SCR reaction temperature is lower than that of SNCR due to the use of catalyst. However, from the perspective of construction cost and operation cost, SCR investment is at least several times, or even more than 10 times, that of SNCR. (Allen Bradley 1769-IQ32 Compact I/O Module, B&R X20A04622 Analog Output Module, Allen Bradley 1769-PA4 CompactLogix Power Supply)

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

Software process

Practical application

After the system was installed and debugged, it was officially put into use in October 1999. It has been running stably for more than two years and has calibrated nearly a hundred flowmeters (times) without any problems in the control system. 

Practice has proved that the system has a high degree of automation, and all performance indicators fully meet the design requirements. 

The PLC control system cooperates with the volumetric tube system, which makes the system have high calibration accuracy, avoids the error caused by human operation, and greatly improves the reliability. 

B&R X20AI1744 I/O Module

Siemens 6ES7331-1KF01-0AB0 SIMATIC S7-300 Analog Input Module

Allen Bradley 1756-A4 Four Slots Chassis

Siemens 6ES7331-1KF02-0AB0 SIMATIC S7-300 Analog Input SM 331

The display screen of the system is rich and intuitive, the operation interface is simple and friendly, and it is easy to use. The workload of the operator is reduced, the work efficiency is greatly improved, and good results are achieved.

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

Vivi (sh_plc@163.com).   

Software and hardware configuration of the control system

(1) Hardware part

① Industrial computer IPC

In order to ensure the high reliability of the system, Advantech IPC610 industrial computer is selected. The specific configuration is: PIII800MHz CPU, 128M memory, 40G hard disk, MAG17-inch flat-panel display, graphics card with 64M video memory, sound card and speakers (for alarm and prompt), etc.

②PLC _ (Siemens 6ES7314-6CG03-0AB0 CPU 314C-2 DP Compact CPU, Allen Bradley 1734-OE4C Analog Output Module, B&R X20AI4622 Analog Input Module, Siemens 6ES7314-6EH04-0AB0 SIMATIC S7-300 CPU 314)

The Modicon MicroTSX3722 PLC of French Schneider Company is selected as the control core of the system. It is small in size, powerful in function and good in scalability. The specific configuration is as follows:

Host: Micro TSX3722 (built-in power supply, CPU)

Analog input (AI) module: TSXAEZ802 is selected, it has 8 high-level analog input terminals, can input standard signals such as 0-20 mA, 4-20 mA, 12-bit A/D conversion accuracy, and has input overshoot monitoring Function and measurement filter anti-interference function;

Analog output (AO) module: choose TSXASZ200, it has two analog output terminals (one common terminal), no external power supply, can output various standard signals, including 0~20 mA, 4~20 mA, ±10 V Wait.

Digital input (DI) module: choose TSXDEZ12D2, which has a schematic diagram of the system structure in Figure 2-1　　

Digital output (DO) module: TSXDSZ08R5 is selected, it has 8 relay outputs, internally provides overload and short circuit protection, and has channel fault self-diagnosis function;

High-speed counting (HSC) module: choose TSXCTZ2A, which has two counting channels, which can count two pulses with a maximum frequency of 40 kHz at the same time, and can realize up-counting, down-counting or up/down counting.　　

Communication (CMM) module: select TSXSCP114PCMCIA card (supporting TSXCM4030 serial connection cable), connect to IPC with TSXSCA50 connector, realize bidirectional data transmission and exchange between PLC and IPC, and the communication protocol is MODBUS.

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

Vivi (sh_plc@163.com).   

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).