6ES7291-8BA20-0XA0输入模块现货供应欢迎询价

6ES7291-8BA20-0XA0输入模块现货供应欢迎询价;
6ES7291-8BA20-0XA0输入模块现货供应欢迎询价;
6ES7291-8BA20-0XA0输入模块现货供应欢迎询价


2.3 网络构成及硬件介绍
　　如图1所示，在该系统设计中有两个网络使用了上海泗博自动化的Modbus转Profibus-DP网关PM-160。网关在这两个网络中的作用不一样，其中：在上层网络中（建立西门子S7-300PLC和横河DCS连接通信），Modbus转Profibus-DP网关PM-160在Modbus侧做Modbus从站，在Profibus-DP侧做从站，建立Profibus-DP主站（西门子S7-300 PLC）和Modbus主站（横河CS3000）的通信。DCS通信部分采用横河型号为ALR121的通信模块，并配套横河提供的Modbus通信软件包，该通信模块通信数据容量为4000字。通过上海泗博自动化的网关配置软件对PM-160进行相关配置，将DCS的读、写指令及数据做相应转换、存储，并映射到西门子PLC的输入、输出映像区，以实现对上下位机控制信息的实时传输。
在下层网络中（建立西门子S7-300PLC和现场智能仪表的连接通信），Modbus转Profibus-DP网关PM-160在Modbus侧做Modbus主站，在Profibus-DP侧做从站，建立Modbus从站（现场各种智能仪表（现场电机、智能开关、变频器、传感器等））与Profibus-DP主站（西门子S7-300PLC）的通信。串口网络（现场智能仪表）设备接口为RS485或者RS232，它们都可以通过上海泗博自动化的Modbus转Profibus-DP网关PM-160实现与西门子S7-300PLC的连接通信。其中，通过使用网关的配套配置软件对PM-160进行相关配置，将需要采集的从站设备信息通过网关读、写命令及数据转换、存储，映射到西门子PLC的输入、输出映射区，以实现PLC对现场智能仪表数据的采集和监控。
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