西门子S7协议-读写_物联网平台_边缘计算网关

概述

在ThingsKit Edge平台的Node-red系统中，【s7-in】 和 【s7-out 】节点是用于与 Siemens S7 PLC（可编程逻辑控制器）进行通信的节点。这些节点允许你在 Node-RED 中与 S7 PLC 进行数据交换和控制。

1. s7-in 节点

s7-in 节点用于从 Siemens S7 PLC 中读取数据。

你可以通过这个节点读取 PLC 中的特定数据块（DB）、输入（I）、输出（Q）、标志（M）等变量的值。

输入

#无

输出

#设备反馈信息
msg.payload

2. s7-out 节点

s7-out 节点用于将数据发送到 Siemens S7 PLC 中。你可以通过这个节点向 PLC 写入数据，控制其输出或更新数据块的值。

输入

#将要写进PLC设备指定数据块的数据
msg.payload

输出

#无

示例及其代码

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配置解析

连接节点连接配置

数据读取配置

上述内容来源：

读取DB块中的变量（DB块必须取消优化的块访问）

读取变量表中的变量（过程映像输入寄存器 I区域）

读取变量表中的变量（过程映像输出寄存器  Q区域）

读取变量表中的变量（中间变量寄存器  M区域）