BAS, SCADA system
Details
Overview of FMCS,BAS, SCADA systems
BAS (Building Automation System) Building automation system or building equipment automation system explanation: is a building or complex of electricity, lighting, air conditioning, water supply and drainage, fire, transportation, security, garage management equipment or system, for the purpose of centralized monitoring, control and management of the integrated system. Through the implementation of comprehensive automatic monitoring and management of various equipment in the building (group), the system provides owners and users with a safe, comfortable, convenient and efficient working and living environment, and makes the entire system and various equipment in the best working state, so as to ensure the economy of the system operation and the modernization, information and intelligence of management.
FMCS (Facility Monitoring Control System) is the monitoring data of each system of factory facilities integrated into the central monitoring server using Ethernet, controller, communication equipment, etc., to form a whole-plant monitoring system to achieve the following purposes: Communicate the whole plant information, improve the overall management performance, simplify the operation and maintenance difficulties, reduce management costs, etc. FMCS is a hierarchical distributed structure of the monitoring system, according to the control level, divided into three layers: the first layer for the field equipment layer. The layer includes all kinds of sensors, transmitters, detectors, valve actuators, variable speed equipment, motor motors, limit switches and other related process equipment and devices, to achieve the collection of field data and the execution of controller commands. The second layer is the control layer. This layer includes the software and hardware that can perform the unit layer operations. There are mainly single loop controller and programmable logic processor and other devices, to achieve the data acquisition of the underlying equipment, the control command, the monitoring of the field control function. The third layer is the management layer, which is divided into on-site subsystem management and whole plant management. The management layer includes operation station, engineer station, master server, OPC server, WEB server, hot backup server, graphic printer, alarm printer, HMI software for SCADA, etc.
SCADA(Supervisory Control And Data Acquisition) system. Data acquisition and monitoring control system. SCADA system is a computer-based DCS and power automation monitoring system. It has a wide range of applications, and can be used in power, metallurgy, petroleum, chemical, gas, railway and other fields of data acquisition and monitoring control and process control.
In the power system, SCADA system is the most widely used and the most mature technology. It plays an important role in the telecontrol system, which can monitor and control the operating equipment in the field to achieve various functions such as data acquisition, equipment control, measurement, parameter adjustment and various signal alarms, that is, we know the "four remote" function. RTU(Remote Terminal Unit),FTU(feeder terminal unit) is an important part of it. It plays a very important role in the construction of substation integrated automation nowadays.
SCADA system, that is, data acquisition and monitoring control system, is mainly used for data acquisition, parameter monitoring, automatic control and alarm processing of industrial production process. SCADA system usually includes several main components: control interface, RTU (telemetry terminal unit), PLC (programmable logic controller), data acquisition and transmission device. These components can be configured according to different application scenarios. Today has experienced four generations of development, today's SCADA system mainly uses Internet technology, object-oriented technology, network technology, information technology, etc., greatly expanding the scope of application of SCADA system and integration with other systems. In addition to the traditional power, petroleum, chemical, gas and other fields, SCADA systems are also increasingly used in the field of intelligent manufacturing, becoming an integral part of the industrial Internet.
System architecture
From the perspective of network architecture, SCADA system is generally composed of lower computer, upper computer and communication network. As follows:
Design objective
● Data acquisition, supervision and control, alarm processing, data storage, event acquisition sequence, data calculation, special RTU processing/control. According to the enterprise equipment data collection needs, to meet all kinds of communication protocols and various equipment communication; Realize real-time and automatic collection of process parameters, output information, quality data, energy consumption value, environmental protection data, equipment status and other data in the entire production process. Through the production general picture, device process flow chart, equipment operation, material flow diagram, energy flow diagram, quality online monitoring diagram, etc., the entire production process is monitored in real time.
● To achieve enterprise production hierarchical control, hierarchical scheduling requirements. According to the scope of scheduling hierarchical management, the system information collection and exchange, security monitoring and control, economic operation and ensure the automatic coordination of control functions at each layer are realized. According to the division of dispatching management scope, responsibility, geographical location and system characteristics, the dispatching control system is divided into levels, permissions and regions. In order to achieve the general modulation, sub-modulation, station control of the authority to receive and release, instructions across the level to the equipment, plant station area to sub-modulation area data aggregation and process, event and other monitoring, sub-modulation area to the general modulation area data aggregation and process, event and other monitoring.
● To achieve a large amount of stable operation, mass historical data compression storage and process flow chart historical playback. The integrity of data is ensured by the function of line break recovery of the acquisition station. Support scenarios with large scheduling requirements to achieve stable operation of complex system databases; Ensure the integrity of historical data, both through the historical trend and process flow chart history playback for scheduling, process and other data analysis, aid decision-making.
● Build a fault-tolerant and redundant IT architecture to meet the stringent requirements of the production environment, and ensure rapid switching and maintenance of production without downtime once the system fails. Provides link redundancy, device redundancy, database redundancy and client redundancy. Data read and write operations on clients are performed on redundant hosts by default, and can be configured on clients.
● Achieve complex network node flexible architecture, multi-person configuration and remote deployment, scalability throughout the life cycle, so that the existing system can be extended at any time. Whether IT is a single user system, a multi-user system or a widely distributed system, SCADA systems can be used to visualize equipment, production lines, and factories, simplify IT deployment, provide integration and automation, save system deployment time and reduce operation and maintenance workload, discover optimization potential, effectively reduce downtime, and ensure rapid product market.
● On the basis of industrial automation, provide basic data support, closely integrate IT and OT, and realize the realization of data value. The process and perception decisions of enterprises can be driven by data, and enterprises can make business judgments and decisions based on data at any time, realizing the realization of data value and thus realizing digitalization. The most critical thing is to be able to use the analytical data to support the intelligent application of enterprises, build the decision-making system of production and operation, and solve the data island problem that has always existed in the manufacturing industry before.
Functional characteristics
Real-time: SCADA system for the production process of continuous, high frequency, large quantities of data acquisition and processing, to ensure the precision and accuracy of the production site.
Reliability: The SCADA system runs stably, maintaining efficient operation even in the face of various complex situations.
Flexibility: SCADA systems can be redeveloped or expanded according to customer needs, as well as integrate third-party equipment and systems.
Security: SCADA system can realize data encryption, verification, backup and other security mechanisms to improve the system's security protection capability.
