描述
3.1信号源硬件设计及工作过程
本系统的硬件部分以Atmel公司的AT89S51单片机为核心,其外围电路主要包括:D/A转换电路、电压转换电路、运算放大电路、集电器模拟温度电路、通信接口电路以及看门狗复位电路。其核心部分是D/A转换电路和运算放大电路,其他电路都是围绕D/A转换功能完善系统、保证程序正常运行而设计的。通信接口电路实现上位机与下位机的数据通信;集电器模拟温度电路实现四路温度的模拟;看门狗复位电路监控程序的运行状态,在死机或“程序走飞”时可使系统自动恢复到正常工作状态。图1所示为系统硬件原理结构框图。
系统工作过程:上位机发送控制字(包括信号通道选择和信号幅值大小)至下位机(单片机),下位机采集控制字后,由单片机程序实现所选信号通道以及信号幅值的大小。下位机产生信号后,通过串行总线将数据发送到上位机并显示在上位机相应的虚拟面板上。产生的信号通过板卡上的外接信号输出端口传输到测试设备相应的通道上,模拟传感器接收信号。如果测试设备接收后显示的信号与板卡输出的信号大小相一致,则认为测试设备性能良好。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
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顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
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◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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