【Scientific and Technological Achievements Introduction】 Programmable Logic Controller (PLC)

Since its birth in 1969, programmable logic controller (PLC,Programmable Logic Controller) has a strong vitality, PLC in industrial automation, manufacturing and building automation and other fields have a wide range of applications.

With the in-depth development of theories advocated by industrial interconnection, Internet of Things and intelligent manufacturing in recent years, PLC, as the "spokesman" of data processing at the field equipment layer, is the preferred equipment for equipment field control and data acquisition. It transmits the production data of industrial manufacturing (such as factories and workshops) into the industrial Internet through communication equipment, and then completes the control of the production process, thus becoming the core force behind the industrial Internet era. Some people think that PLC is omnipotent in the industrial environment.

Today, we will learn about the PLC series products developed by the Institute of Embedded Systems and Internet of Things in our hospital.

 

science and technology research and development]

What is PLC?

Programmable logic controller (Programmable Logic Controller,PLC), is a microprocessor for automation control of digital computing controller, control instructions can be loaded into memory at any time for storage and execution. The programmable controller consists of CPU, instruction and data memory, input/output interface, power supply, digital analog conversion and other functional units. The early programmable logic controller only had the function of logic control, so it was named programmable logic controller. Later, with the continuous development, these computer modules with simple functions have already had various functions including logic control, timing control, analog control, multi-computer communication, etc. The name has also been changed to programmable controller (Programmable Controller), but because its abbreviation PC conflicts with the abbreviation of personal computer (Personal Computer), coupled with customary reasons, people still often use the term programmable logic controller, and still use the abbreviation PLC.

As the core control product of automation, the share of domestic PLC in the domestic PLC market has been unable to exceed 10%, and has become the "short board" of automatic control products, which must be supplemented. If the domestic substitution cannot be realized quickly, it will leave a hidden danger to the domestic information security and the realization of independent control.

 

science and technology innovation]

Embedded has chosen to make breakthroughs and realize industrialization in the field of PLC, and successfully develop large-scale PLC and small and medium-sized PLC, especially the launch of large-scale PLC in 2019, which is one of the few products with successful application cases in China, breaking the situation that there is no commercial application of large-scale PLC in China.

(1)RPC3000 series large PLC

RPC3000 series PLC is a new generation of control system developed for medium and large-scale engineering projects and high-end equipment. It has reached the international advanced level in terms of advancement, stability, reliability, openness and ease of use.

Technical advantages

■ Full integration of process control technology and discrete control technology, both DCS and PLC advantages

■ Single instruction operation cycle is only 0.01us

■ Redundancy: including CPU redundancy, communication redundancy, power supply redundancy

■ Hot-swappable technology, the module can be plugged live

■ I/O capacity can be expanded by 40000 digital quantity and 2500 analog quantity

■ Communication protocols, including TCP/IP, Profinet, Profibus-DP, Modbus, free protocol, etc.

 

(2)RPC2000 series of small and medium PLC

RPC2000 series PLC has a strong control computing ability and high-performance signal processing ability, is the first choice for equipment and small automation engineering control products.

Technical advantages

■ Fast operation speed, strong IO expansion ability, rich communication expansion ability, with the industry's top analog processing ability

■ CPU performance is superior, single instruction processing time is 0.06μs

■ CPU module comes with 1 Ethernet, 1 RS232 and 2 RS485

■ I/O capacity is 504 digital/203 analog

■ Single CPU can be expanded by 25 modules

 

Features and highlights

Programmable Gateway:Using programmable technology, communication technology and data storage technology, multiple serial ports and Ethernet ports are connected.

PLC Portable Downloader:No need to carry a computer to download the PLC program.

Cloud server-based client platform:Using big data, mobile Internet and other technologies, it provides cloud server-based data mining and data management platform software.

GPRS communication module:Built-in positioning function, based on the monitoring of mobile devices, to achieve device positioning function.

AC sampling module:Direct acquisition of three-phase electrical parameters, including current, voltage, power factor, harmonic signals, leakage signals.

　　　
Coal Mine Power Supply Equipment Waste Incineration Power Plant Water Purification System Emergency Water Supply Control

 

industrial application]

Typical case: 5A large scenic spot pumping station centralized control system

Water storage, flood regulation and water conservation are the most important functions of large reservoirs, and pumping stations provide a guarantee for the normal operation of large reservoirs. The pump station cluster control system takes the programmable controller (PLC) as the core to realize the automatic control and dispatching management of the pump station group to ensure the safe operation of the large reservoir. The pumping station cluster control system adopts embedded system and RPC2000 series PLC and Internet of Things intelligent monitoring system developed by the Institute of Internet of Things to realize real-time monitoring of reservoir water level and pump operation status, network cascade of pumping stations, automatic control and dispatching management of pumping stations, and meet the requirements of "unattended (few people on duty)" of pumping stations.

 

　　　
RPC3000 Series Programmable Logic Controller (PLC) RPC2000 Internet of Things Intelligent Monitoring Control Cabinet

Performance and Benefits

PLC collects the data of the pumping station group and interacts with the upper monitoring system to realize information sharing, complete the functions of reservoir water level monitoring, pump station switch start and stop, alarm information processing and so on. Through authorization, managers can obtain pumping station group information anytime and anywhere through computers and mobile phones to realize remote scheduling and management. On the basis of real-time monitoring and remote scheduling, the centralized control system of the pumping station optimizes the control of the equipment, carries out predictive maintenance, and prolongs the service life of the pump.

 

Information Management Platform of Pump Station Cluster Control System

 

Application areas

 

(1) Rail transit automation

rail transit integrated monitoring system

EMC Metro Energy Saving System

Air conditioning group control system in subway station

Metro car air conditioning controller

Metro traction and power supply monitoring

 

(2) Water treatment automation

Monitoring system for reclaimed water treatment

sewage treatment monitoring system

Automatic control of emergency water supply vehicle

Fully automatic integrated sewage treatment equipment

Automatic soft water, sewage processor

 

(3) Coal mine automation

mine drainage monitoring system

Coal Conveying Belt Monitoring System

LV Feeder Switch Controller

High voltage flameproof switch controller

Magnetic starter controller

mobile substation controller

 

(4) Environmental protection and energy saving automation

Flue gas monitoring system

water quality monitoring system

desulfurization control system

industrial energy saving control system

building energy saving monitoring system

 

(5) Heating automation

automatic heat source control

Comprehensive monitoring of heating network

Automatic monitoring of heat exchange station

Unit heating unit control

Energy Management and Optimal Dispatch

 

Cooperative enterprise case

 

Research Institute of Embedded Systems and Internet of Things

The Institute of Embedded System and Internet of Things in our hospital was established in 2016. It has strong technical accumulation and rich industrialization experience in the fields of automation and informatization, and has long been committed to the research of embedded control and Internet of Things technology. Researcher Xu Changrong, director of the Institute, was awarded the title of "Person of the Year in China's Automation Field in 2010" and is currently the chairman of PLC Branch of China Mechatronics Technology Application Association. Based on many years of experience in automation product design, development and application, the Institute integrates advanced and practical signal processing technology, communication technology, computer technology and automatic control technology. Its products have reached the international advanced level in performance, quality, reliability, stability, openness and ease of use. Its PLC technology is perfectly combined with industrial interconnection, cloud computing, big data and other technologies, which provides a perfect solution for intelligent manufacturing users.

 

Technical docking and business negotiation

Contact: Xu Changrong

Fixed telephone: 022-84856585

Mobile Phone: 13701392991

E-mail: xuchangr@tsinghua-tj.org

Fax: 022-84856585 to 608

 

Source | Embedded Systems and Internet of Things Institute

Editor | Wang Xiao

The final interpretation right of the above related technologies belongs to the Institute of Embedded System and Internet of Things.