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Basic structure and type of industrial controller system

2023-02-08

Industrial controllers are used in many modern systems, such as DCS systems that interface with enterprise systems so that the production process can be reflected in the overall operation of the business. DCS system is often used in oil refining, sewage treatment plants, chemical plants and pharmaceutical factories and other industrial control fields. This paper mainly introduces the basic structure and type of industrial controller system.

1. Distributed Control System (DCS)

Industrial controller DCS uses centralized monitoring to coordinate the local controller to execute the entire production process. By modularizing production systems, DCS reduces the impact of a single failure on the entire system. In many modern systems, DCS systems interface with enterprise systems so that the production process can be embodied in the overall operation of the business.

2. Data Acquisition and Monitoring System (SCADA)

< p > SCADA (SupervisoryControlAndDataAcquisition) system is used to control and manage the geographical position of wide-area distributed assets (assets), these assets are generally spread in the range of thousands of square kilometers. In industrial processes, central data acquisition and centralized control are very important for the operation of the whole system. SCADA systems are commonly used in similar water supply projects, sewage treatment systems and natural gas pipelines. sCADA Control center monitors and controls field node equipment in remote communication network, including alarm information and process status data. The central control center relies on the information obtained from the remote site to generate automated or process-driven monitoring instructions and send them to the remote site, so as to achieve real-time control of the remote device, such as the field equipment in the industrial field. Field equipment operations such as valve and circuit breaker opening/closing, sensor data acquisition and field environment monitoring alarm and other local operations.

3. Programmable Logic Controller (PLC) in industrial controller

PLC is in the traditional sequence controller on the basis of the introduction of microelectronics technology, computer technology, automatic control technology and communication technology to form the second generation of new industrial control device. The International Electrotechnical Commission (IEC) has issued a regulation on PLC: Programmable controller is a digital arithmetic operation of the electronic system, designed for use in industrial environments. It uses a programmable memory, which is used to store in its internal operation instructions such as logic and arithmetic operation, control various types of machinery or production process. The programmable controller and its related equipment should be designed according to the principle of easy to form a whole with the industrial control system and easy to expand its function. PLC is widely used in almost all industrial processes and is a key component in SCADA system or DCS control system.

On the problem of industrial controller, this paper mainly introduces the basic structure and type of industrial controller system. Different types of industrial controllers have different characteristics, so the specific use should be selected according to the situation.

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