无绝缘移频自动闭塞系统中采集系统设计.doc

无绝缘移频自动闭塞系统中采集系统设计 　　摘 要:介绍一种基于C8051F020单片机及CPLD芯片EPM3256ATC144-10实现的多种信号采集系统,其主要功能是对ZPW-2000R型移频自动闭塞系统中各种频率信号及交流模拟量、数字量进行采集处理,并与上位机进行数据通信。系统以单片机为核心,利用C8051F020内部ADC完成交流模拟信号的采集,通过两片CPLD实现高精度频率采集和数字信号采集;所有的数据运算处理均由单片机完成,再通过CAN总线等传送至上位机。该系统利用简单的电路设计及较低的成本,很好地满足了实际应用和生产需要;系统中所需控制时序及地址译码等电路均由CPLD产生,所有处理结果均存入RAM。CPU可随时从RAM读取数据,并传送至上位机,为数据的实时性采集和处理提供了有力保证。 　　关键词:CPLD; C8051F020; 频率采集; 交流模拟量采集 　　中图分类号:TP368.1文献标识码:B 　　文章编号:1004-373X(2010)08-0023-04 　　 　　Design of Acquisition System in Automatic Block System with Jointless Frequency-shift Track Circuit 　　TIAN Xia 　　(KTK Group Co. Ltd., Changzhou213102, China) 　　Abstract:A realization method of the multi-signal acquisition system based on single chip C8051F020 and CPLD EPM3256ATC144-10 is introduced,whose main function is to collect and process the frequency signals, AC analog and digitals of ZPW-2000R automatic block system with jointless frequency-shift track circuit, and to communicate with upper computer. This system with the single chip as the core realizes the AC signal acquisition by using ADC in C8051F020, implements the high-precision frequency acquisition and digital acquisition by two CPLDs. All data are processed by the single chip computer and transfered to upper machine via CAN bus. It can satisfy the needs of application and manufacture quite well with a simple circuit design and lower cost, all circuits used for time-sequence control and address decoding are generated in CPLDs, and all precessing results are stored in RAM for CPU reading at any moment, the way which ensures the real-time data acquisition and processing. 　　Keywords:CPLD; C8051F020; frequency acquisition; AC analog acquisition 　　 　　0 引 言 　　随着我国铁路向高速、高密、重载、电气化方向迈进,区间闭塞设备尤其是移频自动闭塞系统得到了迅速的发展, ZPW-2000R型无绝缘移频自动闭塞系统也因此得到了广泛的推广应用。为保证ZPW-2000R型无绝缘移频自动闭塞系统能可靠安全的运行,随移频自动闭塞系统配套,提供了系统维护机,以对系统的运行状态进行全天候监视,方便维护人员及时发现故障,并尽快排除故障,保证安全。本文介绍的采集系统正是为监测ZPW-2000R型无绝缘移频自动闭塞系统维护机的主要设备提供接口。 　　1 ZPW-2000R型无绝缘移频自动闭塞系统简介[1] 　　ZPW-2000R型无绝缘移频自动闭塞系统分室内设备和室外设