6ES7921-3AA00-0AA00 老默说，买它
西门子的 SIMATIC 控制器产品线拥有用来完成广泛自动化任务的适宜控制器。基本型、增强型、分布型控制器和软控制器具有的可扩展性并集成了功能。不管选择哪种控制器，通过在全集成自动化博途 (TIA Portal) 中进行的工程组态，可以为每种应用找到自动化解决方案。
西门子S7-200 SMART PLC的网络通信：S7-200 SMART CPU 模块本体集成1 个以太网接口和1 个RS485 接口，通过扩展CM01 信号板，其通信端口数量多可增至3 个。可满足小型自动化设备连接触摸屏、变频器等第三方设备的众多需求。所有CPU 模块标配以太网接口，支持西门子S7 协议、TCP/IP 协议、有效支持多种终端连接：可作为程序端口（使用普通网线即可）；与SMART LINE HMI 进行通信；通过交换机与多台以太网设备进行通信，实现数据的快速交互，可支持4个设备通信。S7-200 SMART CPU 模块均集成1 个RS485 接口，可以与变频器、触摸屏等第三方设备通信。如果需要额外的串口，可通过扩展CM01 信号板来实现，信号板支持RS232/RS485 自由转换，多支持4 个设备。串口支持下列协议：Modbus-RTU、PPI、USS、自由口通信、与上位机的通信。通过PC Access，操作人员可以轻松通过上位机读取S7-200 SMART 的数据，从而实现设备监控或者进行数据存档管理。
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