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The use of DCS process alarm classification control plays a crucial role in the safety of the site. According to relevant data surveys, the selection of alarms has a significant impact on the level of alarm safety factor. When using this technology, attention should be paid to the selection of alarms.

This article proposes several principles for selecting alarms through the study of different control systems, ensuring that alarms can fully play their role in the system.

The hierarchical control technology can ensure that alarms in different areas are independent. Different alarms are used for alarm monitoring in each area, which can ensure timely alarm in case of abnormal situations within the detection range to attract the attention of operators.

DCS process alarm classification control technology can effectively improve the safety of the operation site, effectively ensuring the safety of construction personnel and enterprises. This article is based on the concept and characteristics of DCS, and studies the application of toxic and harmful gas alarms and key operating parameter alarms, in order to provide reference for scholars in this field.

1. DCS multi-layer hierarchical control system

The basic design concept of DCS is to adopt the idea of decentralized control, centralized operation and management, and achieve a multi-level hierarchical control and cooperative structure. At present, it is mainly used in fields such as metallurgy, power, and petrochemicals.

DCS is a system that implements multi-layer hierarchical control, which has two basic hierarchical links during use: on-site control unit and operation station.

DCS basic grading process

● On site control unit:

A control system that is used near the site and is far away from the control center, and can monitor and control the site based on the DCS’s own structure. The use of on-site control units requires the preparation of different devices, such as configuration plugins, which are configured according to the requirements of the system with corresponding central processing unit plugins, power plugins, and communication plugins, laying the foundation for later hierarchical control;

Redundancy configuration is one of the important links in hierarchical control systems, and during the configuration process, it is necessary to implement redundant configuration for host plugins, power plugins, and communication plugins; Implementing on-site hierarchical control and monitoring requires adding DCS to different hardware to ensure the reliability of hierarchical control.

● Operation station:

The operation station records and displays different data in the control system, which is a place for displaying human-computer interaction. Commonly used operation stations include host control, display devices, and keyboard input devices, which are mainly used for manual operation recording and feedback. It mainly realizes various important functions such as displaying different data, alarms, and operations.

2. Application of DCS process alarm classification control technology

Toxic and harmful gas alarm

Through the study of different DCS process alarm classification control technologies, it has been found that the DCS devices used in current on-site work mainly detect and alarm toxic, harmful, and flammable gases. When these gases are detected, an alarm will be triggered. The alarms on the market have diverse characteristics, and to ensure the normal operation of DCS, standardized alarms should be used.

In the process of selecting alarms, the following rules should be noted:

● It must be able to provide power supply for monitoring toxic and harmful gases and other connecting components;

●Being able to emit appropriate alarm signals after detecting toxic and harmful gases until someone discovers them, greatly improving the effectiveness of the alarm function;

●The range of combustible gas monitoring should be within the normal explosion range;

●Adapt to the concentration and measurement range of toxic and harmful gases, ensuring the detection of harmful gases within the normal range;

●Indicating alarm equipment is quite important and the key to determining whether it can alarm correctly. In the process of selection and purchase, alarm equipment with fire protection and interlocking protection functions should be selected;

●The alarm should have independent monitoring and alarm functions, ensuring that each alarm only monitors toxic and harmful gases within its scope of responsibility;

●The installed alarm should have a continuous alarm function. If toxic and harmful gas leaks are found during use, the alarm function should be activated. When the concentration decreases, the alarm also needs to continue to sound to ensure timely detection of toxic and harmful gas leaks.

Alarm is the key to alarm classification control technology. In the use of modern DCS process alarm classification control technology, responsible personnel can select and use alarms based on the above principles to ensure the safety and standardization of the control site.

Key operating parameter alarm

Each parameter in the DCS process alarm classification control technology using computer control systems needs to be strictly set and controlled. If the parameters are too high or too low, it will cause incalculable losses to the site. It is required to achieve the accuracy and standardization of alarm parameters through strict data analysis when setting alarm parameters.

When setting the alarm mode, a pop-up window or voice alarm can be used to effectively increase the attention of staff, provide the best solution time for staff, and avoid more serious accidents and losses.

Pop up alarm mode

When setting up pop-up alarms, the operator achieves the accuracy of the alarm process through on-site monitoring and control. The pop-up window should be set in the center position of the control display page, making it convenient for the staff to pay attention to the location of the alarm and the direction of the problem at the first time, providing more preparation time for the operator to effectively solve the problems that occur during the process;

● Voice alarm method

The use of voice alarm function requires staff to record the voice alarm in advance according to possible situations on site, and play the alarm information through the computer’s voice output function.

1. Used for switch quantity control

The ability of PLC to control switch quantities is very strong. The number of input and output points controlled can range from a few dozen or tens of points, to several hundred, thousands, or even tens of thousands. Due to its ability to connect to the internet, the number of points is almost unlimited, and no matter how many points are controlled, the logic problems controlled can be diverse: combination, timing, real-time, delayed, non counting, counting, fixed order, random work, and so on, all of which can be carried out.

The hardware structure of PLC is variable, and the software program is programmable, making it very flexible when used for control. If necessary, multiple sets or groups of programs can be written and called as needed. It is very suitable for the needs of multiple working conditions and state transitions in industrial sites.

There are many examples of using PLC for switch quantity control, which are needed in almost all industrial industries such as metallurgy, machinery, light industry, chemical industry, textile, etc. At present, the primary goal of PLC is incomparable to other controllers, which is that it can be conveniently and reliably used for switch quantity control.

2. Used for analog control

Analog quantities, such as current, voltage, temperature, pressure, etc., vary continuously in magnitude. Industrial production, especially continuous production processes, often requires control over these physical quantities.

As an industrial control electronic device, if PLC cannot control these quantities, it is a major drawback. Therefore, various PLC manufacturers are conducting extensive development in this area. At present, not only large and medium-sized computers can perform analog control, but even small computers can also perform such control. PLC should be equipped with A/D and D/A units for converting analog and digital signals for analog control. It is also an I/O unit, but a special I/O unit.

The A/D unit converts analog signals from external circuits into digital signals and sends them to the PLC; The D/A unit converts the digital signals of the PLC into analog signals and sends them to the external circuit. As a special type of I/O unit, it still has characteristics such as anti-interference of I/O circuits, isolation of internal and external circuits, and exchange of information with input/output relays (or internal relays, which are also an area of PLC working memory that can be read and written).

The A in A/D here mostly refers to current, voltage, and also temperature. A in D/A is mostly voltage or current. The range of voltage and current variation is mostly 0-5V, 0-10V, 4-20mA, and some can also handle positive and negative values. The D here is mostly an 8-bit binary number for small computers, and a 12 bit binary number for medium and large computers. A/D and D/A have both single and multiple channels. There are multiple input and output relays that occupy multiple channels. With A/D and D/A units, the remaining processing is all digital, which is not difficult for PLCs with information processing capabilities. Medium and large PLCs have stronger processing capabilities. They can not only add, subtract, multiply, and divide numbers, but also perform square root and interpolation. They can also perform floating-point operations, and some even have PID instructions. They can perform proportional, differential, and integral operations on deviation measures, thereby generating corresponding outputs. Computers can calculate almost everything they can. In this way, it is completely possible to achieve analog control using PLC.

PLC performs analog control, and there are units combining A/D and D/A, which can be controlled using PID or fuzzy control algorithms to achieve high control quality. The advantage of using PLC for analog control is that while analog control is being carried out, the switch quantity can also be controlled. This advantage is not possessed by other controllers, or the implementation of control is not as convenient as PLC. Of course, if the system is purely analog, using a PLC may not be as cost-effective as using a regulator.

3. Used for motion control

The actual physical quantities include not only switch quantities and analog quantities, but also motion control. The displacement of machine tool components is often expressed in numerical quantities. The effective method for motion control is NC, which is digital control technology. This is a computer-based control technology born in the United States in the 1950s. It is already very popular and well-established today. At present, the CNC rate of metal cutting machine tools in advanced countries has exceeded 40% to 80%, and some even higher. PLC is also based on computer technology and is becoming increasingly sophisticated. PLC can receive counting pulses with frequencies ranging from a few k to several tens of k hertz, which can be received in multiple ways and can also be received in multiple channels. Some PLCs also have pulse output function, and the pulse frequency can reach several tens of k. With these two functions, coupled with PLC’s data processing and computing capabilities, if equipped with corresponding sensors (such as rotary encoders) or pulse servo devices, various controls can be fully implemented according to the principle of NC. High and mid-range PLCs are also developed with NC units or motion units, which can achieve point control. The motion unit can also achieve curve interpolation and control curve motion. So, if the PLC is configured with this type of unit, it is entirely possible to use the NC method for digital quantity control. The newly developed motion unit even released a programming language for NC technology, providing convenience for better digital control using PLC.

4. Used for data collection

With the development of PLC technology, its data storage area is becoming larger and larger. For example, the data storage area (DM area) of Kewei Company’s PLC can reach 9999 words. This vast data storage area can store a large amount of data. Data collection can use a counter to accumulate and record the number of pulses collected, and periodically transfer them to the DM area. Data collection can also be done using A/D units. After converting analog signals into digital signals, they are periodically stored in the DM area. The PLC can also be configured with a small printer to regularly print out data from the DM area.

PLC can also communicate with computers, and the data in the DM area is read out by the computer and then processed by the computer. At this point, the PLC becomes the data terminal of the computer.

Power users have used PLC to record their electricity consumption in real-time, in order to achieve different charging methods for different electricity usage times and pricing, and encourage users to use more electricity during low electricity consumption periods, achieving the goal of reasonable and energy-saving electricity consumption.

5. Used for signal monitoring

There are many self-test signals and internal components in PLC, and most users have not fully utilized their functions. In fact, it can be fully used to monitor the PLC’s own work or to monitor the controlled objects. For a complex control system, especially an automatic control system, monitoring and even further self diagnosis are very necessary. It can reduce system failures, make it easy to find faults, increase the cumulative average time between failures, reduce fault repair time, and improve system reliability.

6. Used for networking and communication

PLC has strong networking and communication capabilities, and new networking structures are constantly being introduced.

PLC can be connected to personal computers for communication, and computers can participate in programming and control the management of PLC, making it more convenient to use.

In order to fully utilize the role of computers, a single computer can be used to control and manage multiple PLCs, up to 32 of which can be used. A PLC can also communicate with two or more computers to exchange information and achieve multiple monitoring of the PLC control system. PLC and PLC can also communicate, with one-on-one PLC communication and several PLCs communication, up to tens or hundreds.

PLC, intelligent instruments, and intelligent execution devices (such as frequency converters) can also be networked for communication, data exchange, and mutual operation. It can be connected into a remote control system, with a system range of up to 10 kilometers or more. It can form a local network, not only PLC, but also high-end computers and various intelligent devices can enter the network. It can be either a bus network or a ring network. The net can also be fitted with a net. Networks can also be bridged. Networking can organize thousands of PLCs, computers, and intelligent devices into one network. Nodes between networks can communicate and exchange information directly or indirectly.

Networking and communication are meeting the needs of today’s computer integrated manufacturing systems (CIMS) and the development of intelligent factories. It can enable industrial control from point to line and then to Aero, connecting equipment level control, production line control, and factory management control as a whole, thereby creating higher efficiency. This infinitely beautiful prospect has become increasingly clear in front of our generation.

The above points of application are emphasized from a qualitative perspective. In terms of quantity, PLCs come in both large and small sizes. So its control range can also be large or small. Small ones only control one device, even one component, one site; Large ones can control multiple devices, one production line, and even the entire factory. It can be said that PLC is indispensable in various occasions of industrial control.

Product Introduction:

The GE Genius bus data optical terminal supports a speed of 153.6K and a speed of 153.6K. It has an industrial terminal interface, supports single/dual optical port chain networks, and supports the GE Genius protocol. 35mm rail installation, DC9-30V power supply.

Product classification:

field bus

Product Introduction

The GE Genius bus data optical terminal supports a speed of 153.6K and a speed of 153.6K. It has an industrial terminal interface, supports single/dual optical port chain networks, and supports the GE Genius protocol. 35mm rail installation, DC9-30V power supply Ci-gf120 supports two cascaded uplink and downlink fiber optic interfaces, one data interface, while Ci-gf110 supports one fiber optic interface and one data interface.

Features:

1. Support the GE Genius industrial control fieldbus protocol.

2. The communication speed supports 153.6K.

3. Fiber optic communication can reach a distance of up to 60KM.

4. The interface adopts industrial terminals, providing convenience for on-site wiring.

5. The electrical interface has 600W surge protection and overload protection functions.

6. Adopting DC9-30V wide power input mode, DC1000V power isolation, reverse protection, to meet the needs of different industrial sites.

7. Adopting standard industrial 35mm guide rail installation method.

Specifications:

Electrical interface:

1. GE Genius SER1 and SER2 industrial terminal wiring;

2. Speed: 153.6K;

3. Equipped with 600W surge protection and overload protection functions;

Fiber optic interface:

1. Fiber wavelength: multimode: 850nm, 1310 nm;

2. Single mode: 1310 nm, 1550 nm;

3. Transmission fiber: multimode: 50/125, 62.5/125, 100/140um;

4. Single mode: 8.3/125, 9/125um, 10/125um;

5. Transmission distance: Multimode 2KM; Single mode: 10-60KM;

6. Fiber optic interface types: SC, ST, FC optional; Standard configuration: ST interface.

Other indicators:

1. Current power supply: DC9-30V; 500mA;

2. External dimensions: 120mm * 90mm * 50mm;

3. Working temperature: -10-70 ℃ (-40~+85 ℃ optional);

4. Relative humidity: ≤ 90% (non condensing);

5. Storage temperature: -40~80 ℃.

The Yaskawa frequency converter GA700 series has made its debut with a large capacity, capable of handling heavy loads of 400kW, 450kW, 500kW, and 560kW. The product capacity has been expanded to 560kW (heavy load)/630kW (light load), providing more application scenarios and industry solutions for everyone.

GA700 high-capacity model product features:

Excellent driving performance: equipped with a high-speed CPU, significantly improved control performance and responsiveness. Stable driving can still be achieved during impact loads. Thanks to excellent control methods, higher starting torque and overload capacity at low frequencies have been achieved.

Miniaturization: compact design can significantly save space, and the installation area is reduced by about 40% compared to before. Not only does it improve the flexibility of cabinet design, but it also makes installation simpler.

High frequency output: suitable for applications with high-speed rotation. Supports 590Hz drive for high-speed motors and does not require variable speed gears. It can achieve advantages such as miniaturization, low noise, and energy conservation of machinery.

Control of multiple motors: In addition to asynchronous and synchronous motors, it can also drive SynRM (Synchronous Reluctance) motors.

More energy-efficient: equipped with new energy-saving control functions. It can significantly improve the efficiency under light loads without setting parameters, ensuring that the energy conversion efficiency remains highly efficient and controlled.

Rich communication function: supports multiple communications, and one optional card supports 5 frequency converters to save costs.

Flexible Customizability: Upgrade the user customization tool DriveWorksEZ. By using this tool, even without a PLC, it is possible to customize fault prediction programs, simple positioning control, etc., providing additional value for customer equipment.

The GA700 high-capacity model, as a high-performance universal product, can be applied to industrial machinery that requires high instantaneous torque and high response performance, as well as fluid machinery such as fans and pumps. Especially suitable for sand mills, port machinery, metallurgy, fans, water pumps, extruders and other equipment.

In recent years, with the rapid development of the global economy, the shipbuilding industry has also ushered in new development opportunities. Among them, ship transportation plays an increasingly important role in international trade and logistics transportation. With the continuous expansion of China’s shipping scale, the requirements for efficient and reliable ship power equipment are also increasing. However, the shipbuilding industry is also facing many challenges, with increasingly strict environmental requirements and an urgent trend towards intelligent development of ships.

The sustainable and intelligent development of the shipbuilding industry is closely related to the efficiency of ship operation, and ensuring the smooth operation of ships requires the motor to always maintain stability, reliability, safety, and efficiency.

Therefore, it has become an urgent task for shipbuilding enterprises to reduce operating costs and improve ship performance. With the increasing awareness of environmental protection, how to improve the efficiency of ship operation to reduce its impact on the environment has become a hot topic of concern in the shipping industry.

How can ABB motors and generators help the shipbuilding industry create an energy-saving future during this critical period of energy conservation and efficiency enhancement?

ABB Motors and Generators is a leading global manufacturer of motors and generators with over 130 years of industry experience. ABB Motors and Generators is committed to providing efficient, reliable, and intelligent motor and generator solutions for the shipbuilding industry.

In terms of energy conservation, the innovative products and solutions provided by ABB motors and generators can help the shipbuilding industry improve energy efficiency and reduce operating costs. For example, ABB’s ultra efficient motors can increase energy efficiency to 99.5%, saving 30% energy compared to traditional motors. In addition, ABB also provides intelligent motor control systems that can help ships achieve precise speed regulation and load control, further improving energy efficiency.

In terms of environmental protection, the green motors and generators provided by ABB motors and generators can help the shipbuilding industry reduce its impact on the environment. For example, ABB’s low-carbon generators can reduce NOx emissions by 90% and PM emissions by 95%. In addition, ABB also provides renewable energy solutions that can help the shipbuilding industry achieve zero emission operations.

In terms of intelligence, ABB motors and generators provide intelligent motors and generators that can help ships achieve more efficient, safer, and more reliable operation. For example, ABB’s intelligent motors can monitor the motor’s operating status in real time through sensors and data analysis, timely warn of faults, and improve the motor’s service life. In addition, ABB also provides intelligent power system solutions for ships, which can help ships achieve more flexible and reliable power supply.

In summary, ABB motors and generators provide innovative products and solutions for the shipbuilding industry in terms of energy conservation, environmental protection, and intelligence, which can help the industry create an energy-saving future.

According to statistics from the Semiconductor Industry Association (SIA) in the United States, global semiconductor industry sales totaled $48 billion in November 2023, an increase of 5.3% compared to $45.6 billion in November 2022. This is the first time since August 2022 that global semiconductor sales have achieved year-on-year positive growth.

SIA President and CEO John Neuffer said, “Global semiconductor sales increased year-on-year for the first time since August 2022 in November last year, indicating that as we enter a new year, the global chip market is continuing to strengthen. Looking ahead, the global semiconductor market is expected to achieve double-digit growth in 2024.”

In terms of regions, sales in Chinese Mainland (7.6%), Asia Pacific (7.1%), Europe (5.6%) and America (3.5%) all achieved year-on-year growth. Among them, the semiconductor sales in Chinese Mainland increased by 7.6% year on year and 4.4% month on month, which is the main contributor to the growth of global semiconductor sales.

A $13 billion acquisition case is about to be completed

In addition, according to foreign media reports, American chip manufacturer Intel is about to acquire Israeli chip design company Mellanox for $13 billion. This transaction will enhance Intel’s competitiveness in data centers and cloud computing.

Mellanox is a leading Israeli chip design company focused on high-speed interconnect chips. The company’s products are widely used in fields such as data centers, cloud computing, storage, and artificial intelligence.

Intel stated that the acquisition of Mellanox will enable it to provide customers with more comprehensive interconnect products and solutions. This will help Intel further expand its market share in data centers and cloud computing.

The ABB Unitrol 1020-0006 is a compact and powerful automatic voltage regulator (AVR) that is part of the ABB Unitrol 1000 series. It is designed for use with small and medium-sized synchronous generators and industrial machinery.

The Unitrol 1020-0006 features a high-performance control system that provides stable and reliable voltage regulation. It also has a number of built-in features, such as power factor and reactive power control, soft start, and automatic synchronization.

Here are some of the key features of the ABB Unitrol 1020-0006:

• Automatic voltage control with adjustable PID controller
• Power factor and reactive power controller with PID control algorithm
• Soft start function to limit inrush current
• Automatic synchronization for easy paralleling of generators
• Built-in communication options, including RS-232 and Profibus DP
• Compact and lightweight design for easy installation

The ABB Unitrol 1020-0006 is a versatile AVR that can be used in a wide variety of applications. It is a good choice for applications that require precise voltage regulation, such as data centers, hospitals, and manufacturing plants.

Here are some additional details about the specific model number you provided:

• Full: This indicates that the Unitrol 1020-0006 is a complete unit with all of the necessary components.
• 3BHE030579R0006: This is the part number for the Unitrol 1020-0006.
• UNS 0119: This is the serial number for the specific unit that you are interested in.
• CMT1000: This is the code for the type of excitation system that is used in the Unitrol 1020-0006.

ABB 129740-002 is ABB’s Smart I/O intelligent weight module. It is a modular and scalable solution for measuring and controlling weight. This module has multiple functions, including:

High precision weighing

high reliability

Flexible scalability

ABB 129740-002 can be used for various applications, including:

industrial process control

Packaging and sorting

Food and beverage processing

Logistics and warehousing

This module has the following specifications:

Measurement range: 0-1000 kg

Resolution: 0.01 kg

Output signal: 4-20 mA, RS485

Power supply: 24 VDC

ABB 129740-002 is a powerful and reliable intelligent weight module suitable for various applications.

笔记

The GE IS420UCSBS1A is a UCSB Controller Module that functions as a safety controller. It is part of the Mark VIe and Mark VIeS control systems, which are used in a variety of industrial applications, including power generation, oil and gas, and chemical processing.

The IS420UCSBS1A is a high-performance safety controller that is designed to meet the most demanding safety requirements. It is equipped with a number of features that make it ideal for use in critical applications, including:

• Redundant processors and communication channels
• Self-testing diagnostics
• Fail-safe operation
• The ability to be programmed in a variety of languages

The IS420UCSBS1A is also certified to a number of international safety standards, including IEC 61508.

The IS420UCSBS1A was discontinued by General Electric in September 2022. However, it is still available from a number of third-party suppliers.

Here are some of the specifications of the IS420UCSBS1A:

• Processor: Dual PowerPC 440 processors
• Memory: 512 MB SDRAM
• Storage: 2 GB flash memory
• Communication: Dual Ethernet ports, dual RS-232 ports, USB port
• Power supply: 24 VDC