摘要 可编程序控制器(PLC)是一种集自动化技术、计算机技术和通信技术为一体的高可靠性的工业计算机，应用很广泛，现在已经越来越成熟，小批量、多品种、多规格、低成本和高质量的产品不断涌入市场。
本设计主要是在西门子编程软件S7-300的基础上实现PLC的前馈反馈系统的设计，并通过具体的实例，即对加热炉温度的前馈反馈控制的实现来说明前馈反馈的具体流程。
加热炉内的实时温度经过温度传感器、温度变送器将模拟量传送给PLC的模拟量输入模块，模拟量输入模块将模拟量转换成数字量送到PLC内部处理，再由模拟量输出模块将数字量转换为模拟量输出控制阀门的开度以达到炉内温度稳定的控制。
本文研究的重点是如何用PLC以及WinCC对现场的前馈-反馈控制系统进行控制的，如何将前馈-反馈控制系统得到的数据经过PLC后传送到上位机，用组态软件WinCC进行实时监控。
经仿真运行后，本系统能实现控制要求。
关键字：前馈-反馈控制；可编程控制器；WinCC;加热炉promoted development, and The ability to resolve conflicts and constantly improve, our ... 6. on the building of Socialist culture in China. A country, a nation strong, always supported by culture flourished, the inheritance and development of civilization, without culture to develop and prosper, there will be no realization of the dream of China. 18 big yilai, XI General Secretary around "foster and promote Socialist core values" "promote China excellent traditional culture" "firmly master ideology work led right and discourse right", aspects do has series important speech, main including put publicity thought work do have better for achieved China dream condensed powerful moral support improve national culture soft strength foster and promote Socialist core values youth to consciously practice line Socialist core values Childhood actively cultivate and practice the core values of socialism and the party's important speech on the press conference. 7. promote the reform and development of social undertakings and social management. 18 big yilai, Central insisted put guarantees and improved livelihood as ruling acting political of starting point and foothold, Xia big pneumatic solution masses most care most directly most reality of interests problem, 3 years cumulative reduction poverty more than 50 million people, equivalent to a medium national population of total, annual added town employment more than 10 million people, starts construction supportability housing engineering near 4 million sets, built world Shang scale maximum, and cover universal of basic medical guarantees network and pension guarantees network, urban and rural residents income continued growth, The lives of the people of all ethnic groups have more on both material and spiritual thriving. This aspects XI General Secretary of speech main including promoted poverty area poverty, and speed up development let 1.3 billion people enjoys better more fair of education speed up advance housing guarantees and supply system construction always put people life security put in first bit efforts put China construction became network power insisted general national security views, go China features national security road effective maintenance national security and social settled,. 8. with regard to comprehensive strictly administering the party. Party of 18 big yilai, Central station in party and national survival of height, firmly grasp strengthening party of ruling capacity construction, and advanced purity construction this article mainline, to style construction for breakthrough, to developed introduced eight items provides started start, put discipline and rules is in front, organization carried out has party of mass line education practice activities and "three strict three real" topic education, insisted "zero tolerance, and full cover, and no area", insisted "Tiger" "flies" with playing, style political wind society continued improved, More perfect system of laws within the party, discipline of authoritative seriousness increasing, for the history of winning has a lot of new features provide a strong politicalAbstractProgrammable Logic Controller (PLC) is a set of automation technology, computer technology and communication technology as one of the high reliability industrial computer，and PLC is widely used. Now it is more and more mature，smaller quantities, more kinds ,lower cost and higher quality in the market. This design is abased on the programming software of Siemens to implement PLC-based feedforward-feedback control system. This design introduces an example to explain the procedure of feedforward-feedback system. The example is that through temperature control in heating furnace which is used feedforward and feedback control system.Real-time temperature, inside the furnace, after the temperature sensors, temperature transmitters discovered will be sent to the analog input module of PLC. Analog input modules convert analog to digital, and sent the digital data to CPU of PLC to process. Then analog output modules convert digital to analog to control valve, so the system achieves a stable furnace temperature control. Focus of this study is about that how to use PLC and WINCC to control feedforward-feedback system of on-scene, and how to make feedforward-feedback system convey the date to computer via PLC, then, using configuration software Wincc implement real-time monitoring.Keywords：feedforward-feedback；Programmable Logic Controller；WinCC；heating furnacepromoted development, and The ability to resolve conflicts and constantly improve, our ... 6. on the building of Socialist culture in China. A country, a nation strong, always supported by culture flourished, the inheritance and development of civilization, without culture to develop and prosper, there will be no realization of the dream of China. 18 big yilai, XI General Secretary around "foster and promote Socialist core values" "promote China excellent traditional culture" "firmly master ideology work led right and discourse right", aspects do has series important speech, main including put publicity thought work do have better for achieved China dream condensed powerful moral support improve national culture soft strength foster and promote Socialist core values youth to consciously practice line Socialist core values Childhood actively cultivate and practice the core values of socialism and the party's important speech on the press conference. 7. promote the reform and development of social undertakings and social management. 18 big yilai, Central insisted put guarantees and improved livelihood as ruling acting political of starting point and foothold, Xia big pneumatic solution masses most care most directly most reality of interests problem, 3 years cumulative reduction poverty more than 50 million people, equivalent to a medium national population of total, annual added town employment more than 10 million people, starts construction supportability housing engineering near 4 million sets, built world Shang scale maximum, and cover universal of basic medical guarantees network and pension guarantees network, urban and rural residents income continued growth, The lives of the people of all ethnic groups have more on both material and spiritual thriving. This aspects XI General Secretary of speech main including promoted poverty area poverty, and speed up development let 1.3 billion people enjoys better more fair of education speed up advance housing guarantees and supply system construction always put people life security put in first bit efforts put China construction became network power insisted general national security views, go China features national security road effective maintenance national security and social settled,. 8. with regard to comprehensive strictly administering the party. Party of 18 big yilai, Central station in party and national survival of height, firmly grasp strengthening party of ruling capacity construction, and advanced purity construction this article mainline, to style construction for breakthrough, to developed introduced eight items provides started start, put discipline and rules is in front, organization carried out has party of mass line education practice activities and "three strict three real" topic education, insisted "zero tolerance, and full cover, and no area", insisted "Tiger" "flies" with playing, style political wind society continued improved, More perfect system of laws within the party, discipline of authoritative seriousness increasing, for the history of winning has a lot of new features provide a strong political2目录1 绪论 (1)1.1 国内外研究现状 (1)1.2 本课题研究内容及方法 (2)2 基于PLC的双闭环流量比值控制系统设计 (3)2.1 系统的工艺流程 (3)2.2 控制系统的硬件选型 (4)2.2.1 PLC的发展及特点 (4)2.2.2 PLC的内部结构 (5)2.2.3 西门子公司的S7系列PLC (7)2.2.4 CPU的选型 (8)2.2.5 I/O模块的选型 (8)2.2.6 电源模块的选型 (9)2.3 系统各部分硬件选型 (9)2.3.1 温度传感器的选择 (10)2.3.2 温度变送器的选择 (10)2.3.3 流量计与压力变送器的选择 (10)2.4 软件设计方案 (11)2.4.1 STEP 7编程软件的简介 (11)2.4.2 系统控制方案的选择 (11)2.4.3 加热炉前馈-反馈系统控制流程图 (12)2.4.4 PID控制及其控制算法 (13)2.5 程序的编写 (15)3 WinCC组态与仿真 (20)3.1 新建工程 (20)3.2 建立Wincc与PLC的通信连接 (21)3.3 创建供料系统的过程画面 (25)3.3.1 创建画面 (25)3.3.2 仿真结果 (27)结束语 (33)致谢 (35)参考文献 (36)reform results, economy, and political system, and culture system, and social system, and discipline check system, and party of construction system reform solid advance, tax, and financial, and price, and administrative approval, and State-owned enterprises, and ecological civilization, important field and key link reform made major progress, market in resources configuration in the of decisive role significantly enhanced, Unprecedented burst of momentum and vitality of economic and social development. XI General Secretary's speech in this regard include the reform only when there is no complete, the < decisions of the CPC Central Committee on some major problems in deepening reform > notes on the 18 session of ideas into the party's spirit of the reforms more difficult to move forward, the increasing use of the Socialist system with Chinese characteristics such as the ability to run the country. 4. with regard to promoting sustained and healthy economic development. Face complex changeable of international situation and difficult heavy of domestic reform development stable task, XI General Secretary made China economic development into new normal of science judge, proposed innovation, and coordination, and green, and open, and shared five big development concept, implementation macro policy to stability, and industry policy to associate, and micro policy to live, and reform policy to real, and social policy to backing five big pillar sex policy, vigorously advance supply side structural reform, new concept, achieved has 2013 to 2015 during, Domestic production total annual growth 7.3%, obviously fast Yu earlier world economic 2.3% of annual growth, on world economic growth of contribution over 25%, tertiary industry accounted for domestic production total share over 50%, eventually consumption on economic growth of contribution rate reached 66%, economic structure adjustment made important progress, development of quality and benefits significantly upgrade, China economic show out huge of swing room and broad of development prospects. This aspects XI General Secretary of speech main including economic growth must is real and no water of growth improve open type economic level "see missing of hand" and "see have see of hand" are to with good speed up from elements drive, and investment scale drive development mainly to to innovation drive development mainly of change active promoted China energy production and consumption revolution,. 5. with regard to building the rule of law in China. 18 big yilai, Central tightly around full advance law ruling, put party of led, and people masters, and law ruling organic unified up, insisted law ruling, and law ruling, and law administrative common advance, insisted rule of law national, and rule of law Government, and rule of law socialone construction, full advance science legislation, and strictly law enforcement, and just judicial, and universal law-abiding, China features socialist legal system further sound perfect, leaders at all levels cadres using rule of law thinking and rule of law way deepening reform, and附录 (37)1.完整程序 (37)2.整体仿真画面 (42)promoted development, and The ability to resolve conflicts and constantly improve, our ... 6. on the building of Socialist culture in China. A country, a nation strong, always supported by culture flourished, the inheritance and development of civilization, without culture to develop and prosper, there will be no realization of the dream of China. 18 big yilai, XI General Secretary around "foster and promote Socialist core values" "promote China excellent traditional culture" "firmly master ideology work led right and discourse right", aspects do has series important speech, main including put publicity thought work do have better for achieved China dream condensed powerful moral support improve national culture soft strength foster and promote Socialist core values youth to consciously practice line Socialist core values Childhood actively cultivate and practice the core values of socialism and the party's important speech on the press conference. 7. promote the reform and development of social undertakings and social management. 18 big yilai, Central insisted put guarantees and improved livelihood as ruling acting political of starting point and foothold, Xia big pneumatic solution masses most care most directly most reality of interests problem, 3 years cumulative reduction poverty more than 50 million people, equivalent to a medium national population of total, annual added town employment more than 10 million people, starts construction supportability housing engineering near 4 million sets, built world Shang scale maximum, and cover universal of basic medical guarantees network and pension guarantees network, urban and rural residents income continued growth, The lives of the people of all ethnic groups have more on both material and spiritual thriving. This aspects XI General Secretary of speech main including promoted poverty area poverty, and speed up development let 1.3 billion people enjoys better more fair of education speed up advance housing guarantees and supply system construction always put people life security put in first bit efforts put China construction became network power insisted general national security views, go China features national security road effective maintenance national security and social settled,. 8. with regard to comprehensive strictly administering the party. Party of 18 big yilai, Central station in party and national survival of height, firmly grasp strengthening party of ruling capacity construction, and advanced purity construction this article mainline, to style construction for breakthrough, to developed introduced eight items provides started start, put discipline and rules is in front, organization carried out has party of mass line education practice activities and "three strict three real" topic education, insisted "zero tolerance, and full cover, and no area", insisted "Tiger" "flies" with playing, style political wind society continued improved, More perfect system of laws within the party, discipline of authoritative seriousness increasing, for the history of winning has a lot of new features provide a strong political4广西工学院2011届毕业论文基于PLC的前馈-反馈控制系统的设计1 绪论1.1 国内外研究现状现代社会要求生产厂商能对市场的需求做出迅速反应，生产出小批量、多品种、多规格、低成本和高质量的产品。
