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基于CAN总线的智能压力变送器的设计研究
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摘要
随着信息技术、网络技术和自动化技术的飞速发展,传统仪表易失控、可靠性和互换性等缺点和不足日益明显,越来越不能满足用户的需求。新的总线型仪表除了能够完成基本的测量功能外,还具有现场总线通信功能和控制功能。现场总线技术的发展改变了传统控制系统结构,在总线条件下与控制网络相结合,逐渐形成网络集成式全分布控制系统—现场总线控制系统。
     课题研究针对总线型仪表的要求,选用TI公司MSP430系列微控制器和PC10系列压力传感器,开发了一种基于CAN总线的智能压力变送器。论文主要内容包括:1.对CAN总线技术特点、技术规范、器件及其应用的分析;2.硬件配置设计分析,包括微控制器模块、传感器模块、液晶显示模块、通信模块、电源模块以及仪表的抗干扰措施的设计;3.软件系统设计分析,包括初始化模块、数据采集模块、数据处理模块、LCD显示模块、控制模块、通信模块及系统测试模块的编写;4.仪表的测量和通信功能的试验和调试,并对试验数据加以分析,进一步确定仪表的基本性能指标,验证了该仪表能够满足总线型智能仪表的要求。
     试验结果表明,现场总线技术实现了远程节点信息交换的新途径,增加了双向数字通信的功能;现场总线采用数字信号传输,切实解决了变送器的抗干扰问题。压力变送器的压力测量精度为0.25级,传感器线性度较高。结合MSP430单片机的低功耗特性和技术要求,提高了系统的可靠性、自治性和灵活性,达到了智能化变送器的效果。
With the amazing development of communication, network and automation technology, the disadvantage of the traditional instrument in reliability and interchange ability is more and more obvious and thus it couldn't meet the users'requirements. The new generation of field bus instrument should not only have the fundamental measurement capability, but also possess the field bus communication function and control function. The development of field bus technology has changed the structure of traditional control system and combined with control network to bring forward an integrated full-distributed system,namely the field bus control system.
     In order to meet with the requirements of field bus instruments, an intellectual pressure transmitter based on CAN field bus technology has been developed. It has exploited the TI products: MSP430 series microcontroller and PC10 series pressure sensor with CAN interface. The thesis includes the following parts: The first part is about CAN field bus, including its feature, technical specification, protocol, device and application. The second part is about the hardware design, including the microcontroller module, the sensor module, the LCD module, the communication module, the power module and the anti-interference measures. The third part is about the software design, including the initialization module, data acquisition, data processing, LCD communication, control, communication and system testing. The fourth part is about the instrument measuring, communication function debugging and data analyzing. It comes to the conclusion that the instrument conforms to the requirements of field bus intellectual applications.
     The research indicates that the FCS technology achieves the information exchange among remote node in a new way which adds the function of bilateral digital communication. The rating of pressure measurement precision of the transmitter is 0.25 and the sensor is characteristic of high linearity. The field bus has solved the anti-interference problem of the transmitter through adopting the digital signals transmission and has improved the reliability, autonomy and agility of the system for combining the low wastage and the technologic requirements of the MSP430 SCM which achieving the effect of intellectual transmitter.
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