The role of DCS monitoring software 10

Distributed control system referred to as DCS, that is, distributed control system, is a multi-level computer system composed of process control level and process monitoring level with communication network as the link, integrating computer, communication, display and control and other 4C technology, its basic idea is decentralized control, centralized operation, hierarchical management, flexible configuration and convenient configuration. DCS has the following features:

1) High reliability Because DCS disperses the system control function on each computer, and the system structure adopts a fault-tolerant design, the failure of a computer will not lead to the loss of other functions of the system. In addition, because the tasks undertaken by each computer in the system are relatively simple, a special computer with a specific structure and software can be used for the functions that need to be realized, so that the reliability of each computer in the system is also improved.

2) open DCS adopts open, standardized, modular and serial design, each computer in the system adopts LAN mode communication to realize information transmission, when it is necessary to change or expand the system function, the new computer can be easily connected to the system communication network or removed from the network, almost does not affect the work of other computers in the system.

3) Flexibility through the configuration software according to different process application objects for software and hardware configuration, that is, to determine the measurement and control signals and the connection relationship between each other, from the control algorithm library to select the applicable control law and from the graphics library to call the basic graphics to form a variety of monitoring and alarm screens, so as to conveniently constitute the required control system.

4) Easy to maintain a single function of small or micro special computer, with simple maintenance, convenient characteristics, when a part or a computer failure, can be replaced without affecting the operation of the whole system, quickly troubleshooting.

5) Coordination Each workstation transmits various data through the communication network, and the whole system information is shared and coordinated to complete the overall function and optimization of the control system.

6) Complete control functions Rich control algorithms, integrating continuous control, sequential control and batch control, can realize advanced control such as cascade, feedforward, decoupling, adaptive and first-class control, and can easily add the required special control algorithms. The composition of DCS is very flexible, and can be composed of a dedicated management computer station, an operator station, an engineer station, a recording station, an on-site control station and a data acquisition station, as well as a general-purpose server, an industrial control computer and a programmable controller. The process control level at the bottom level is generally realized by the scattered on-site control station, data acquisition station, etc., and transmitted to the production monitoring computer through the data communication network.

The production monitoring level carries out centralized operation and management of data from the process control level, such as various optimization calculations, statistical reports, fault diagnosis, display alarms, etc. With the development of computer technology, DCS can be connected with higher-performance computer equipment through the network to achieve more advanced centralized management functions, such as planning and scheduling, warehouse management, energy management, etc.

The parameters of each device are continuously monitored, and the automatic operation of the equipment is controlled in a predetermined way.

Real-time monitoring of the parameters of the production process. Control.

system abbreviated as DCS).

Definition: The control system designed on the basis of multiple microprocessors, with decentralized control functions, centralized display operations, and the principle of decentralization and autonomy and comprehensive coordination, is called distributed control system (DCS).

Technical support: four C technology (computer technology, communication technology, CRT display technology, CRT process control technology).

From the point of view of the control system:

DCS is a hierarchical control system. Different functions are done at each level. The functional hierarchical system is a significant feature of the decentralized control system, and it is the key to realize the decentralization of control functions and the centralization of operation and display.

1.Process control level.

Equipment: field station (acquisition station, control station).

Function: data acquisition, computing processing and control output; Communication through communication networks and control management level communication.

Composition: communication module, controller module and IO module.

2.Control the administrative level.

Equipment: Operator Station, Engineer Station.

Functions: Monitoring and Operation; Interfaces between people and processes. Data is sent to the production management level through the gateway machine.

engineering configuration, parameter adjustment and system maintenance; The interface between people and systems.

Composition: host and peripherals.

3.Production management level.

Equipment: Real-time data server, workstation.

Functions: monitoring and management of plant-level production process, plant-level fault diagnosis and analysis, plant-level performance index calculation. Data is sent to the operation and management level through the gateway machine.

4 .Management level.

Devices: Data servers, workstations.

Functions: plant-level operation management, financial management and personnel management, etc.

From an information systems perspective:

DCS is a data communication system with different network structures, connecting nodes with different functions to realize information transmission and exchange between nodes.

From the point of view of the computer system:

DCS is divided into hardware system and software system.

1 Hardware system.

A range of microprocessor-based smart modules, process channels, communication interfaces, and various peripherals.

2 Software systems.

It includes an operating system for system management, a database system, data communication software, configuration software and a series of standardized functional modules for process control.

In this paper, the transformation scheme is analyzed by using Siemens' S7-400 large-scale PLC to transform the DCS system of the No. 4 oxygen generator of Benxi Iron and Steel Oxygen Plant as an example.

You call me and I'll tell you or use QQ to give me the message.