IOP341 Distributed unit METSO

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Essential details：IOP341 Distributed unit METSO

Distributed control system development is roughly divided into four stages:
The first phase (1975-1980) was represented by Honeywell’s TDC2000, ABB Baily’s Network90, Foxboro’s Spectrum, and Yokogawa’s Centum. It consists of process control unit (PCU), data acquisition device (DAU), CRT operation station, monitoring computer and data highway (HW).
The second stage (1980-1985) mainly represented the TDC3000 of Honeywell and the Centum A, B, D of Yokogawa. It is mainly composed of local network LAN (IEEE 802.4 and ISO 8802/4 communication standards), multi-function controller (MC), enhanced operating station EOS, universal operating station US, inter-network connector GW, system management module SMM and main computer HC.
In the third stage (1985-1990), DCS extended to computer network control, further combined production process control, supervision control and management scheduling, and strengthened the function of the intermittent system, and adopted the Manufacturing Automation Protocol (MAP) standard based on the expert system and open system interconnection reference model. As well as many new technologies in hardware, so as to overcome the problem of automation island. Typical products include Honeywell TDCS3000 (including Universal Control Network, Process Manager and Logic Manager interface devices integrating data acquisition and process control), 13 Yokogawa Centum — XL, Bailey INFI One 90, etc.
The fourth stage (after 1990), DCS to control integration appeared, in the hardware using open workstations, using the Client/Server structure, in the network structure to increase the factory information network, and can be networked with the Internet, in the software using UNIX and X-Windows graphical user interface, The software of the system is richer, and some software that optimizes and manages the interface well is developed and transplanted to DCS. Typical products include Honeywell’s TPS control system, Yokogawa’s Centum-CS control system, and Foxboro’s I/ASS0/51 system.

IOP341

Distributed control system is developed on the basis of computer supervisory control system, direct digital control system and computer multi-level control system. It is a relatively perfect control and management system in the production process. It has the following characteristics:
(1) High reliability due to DCS system control function scattered in each computer, the system structure adopts fault-tolerant design, so a computer failure will not lead to the loss of other functions of the system. In addition, since the tasks undertaken by each computer in the system are relatively simple, special computers with specific structures and software can be used for the functions that need to be realized, thus improving the reliability of each computer in the system.
(2) Open DCS using open, standardized, modular and serialized design, the system of each computer using LAN communication, information transmission. When the system function needs to be changed or expanded, the new computer can be conveniently connected to the system communication network or removed from the network, almost without affecting the work of other computers in the system.
(3) The flexibility of the software and hardware configuration according to different flow application objects through the configuration software, that is, to determine the measurement and control signals and the connection relationship between each other, select the applicable control law from the control algorithm library and call the basic graphics from the graphics library to form a variety of monitoring and alarm screen, so as to facilitate the construction of the required control system.
(4) Easy to maintain a single function of the small or micro special computer, with the characteristics of simple maintenance, convenient, when a local or a computer failure, can be replaced online without affecting the operation of the entire system, quickly troubleshoot.
(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 and rich control algorithms, set continuous control, sequence control and batch control in one, can realize cascade, feedforward, decoupling, adaptive and predictive control and other advanced control, and can easily add the required special control algorithm.

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