FOXBORO SY-60702001RA SY-61025006RA SY-61025004RA SY-61025001RA SY-60399001R SY-60301001RB 工控模块
FOXBORO SY-60702001RA SY-61025006RA SY-61025004RA SY-61025001RA SY-60399001R SY-60301001RB 工控模块,仪器仪表作为其构成元素,它的技术进展是跟随控制系统技术的发展而发展的。目前,控制理论已发展到智能控制的新阶段,自动化仪器仪表的智能化就成为必然了。
仪器仪表的智能化主要归结于微处理器和人工智能技术的发展与应用。
例如运用神经网络、遗传算法、进化计算、混沌控制等智能技术,使仪器仪表实现高速、高效、多功能、高机动灵活等性能。
70年代中期,由于设备大型化、工艺流程连续性要求高、要控制的工艺参数增多,而且条件苛刻,要求显示操作集中等,使已经普及的电动单元组合仪表不能完全满足要求。在此情况下,业内厂商经过市场调查,确定开发的DCS产品应以模拟量反馈控制为主,辅以开关量的顺序控制和模拟量开关量混合型的批量控制,它们可以覆盖炼油、石化、化工、冶金、电力、轻工及市政工程等大部分行业。
1975年前后,在原来采用中小规模集成电路而形成的直接数字控制器(DDC)的自控和计算机技术的基础上,开发出了以集中显示操作、分散控制为特征的集散控制系统(DCS)。由于当时计算机并不普及,所以开发DCS应强调用户可以不懂计算机就能使用DCS;同时,开发DCS还应强调向用户提供整个系统。此外,开发的DCS应做到与中控室的常规仪表具有相同的技术条件,以保证可靠性、安全性。
FOXBORO SY-60702001RA SY-61025006RA SY-61025004RA SY-61025001RA SY-60399001R SY-60301001RB 工控模块
FOXBORO SY-60702001RA SY-61025006RA SY-61025004RA SY-61025001RA SY-60399001R SY-60301001RB Controller module has actually been in use since the 1940s, Early field based meters and later relays formed the precursor to the control system. Represented by PLC and DCS, since the application of **** in 70 years, it has achieved rapid development in industrial process control such as metallurgy, electric power, petroleum, chemical industry and light industry. Since **** in 1990, fieldbus control systems and PC-based control systems have appeared one after another. This paper will briefly introduce various common control systems, and analyze the evolution process and development direction of control systems.
In the mid-1970s, due to the large size of equipment, high requirements for process continuity, increased process parameters to be controlled, harsh conditions, and centralized display operations, the already popular electric unit combination instrument can not fully meet the requirements. In this case, the industry manufacturers through market research, determined that the development of DCS products should be based on analog quantity feedback control, supplemented by switching quantity sequence control and analog quantity switching quantity mixed batch control, they can cover oil refining, petrochemical, chemical, metallurgy, electric power, light industry and municipal engineering and other most industries.
Around 1975, on the basis of the automatic control and computer technology of the direct digital controller (DDC) formed by the original small and medium-sized integrated circuit, a distributed control system (DCS) characterized by centralized display operation and decentralized control was developed. Since computers were not popular at that time, the development of DCS should emphasize that users can use DCS without understanding computers; At the same time, DCS development should also emphasize providing the entire system to the user. In addition, the DCS developed should have the same technical conditions as the conventional instruments in the central control room to ensure reliability and safety.
FOXBORO SY-60702001RA SY-61025006RA SY-61025004RA SY-61025001RA SY-60399001R SY-60301001RB 工控模块
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