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"MB_CLIENT" 指令通过一个 PROFINET 连接来作为 Modbus/TCP 客户端进行通信。在客户端和服务器之间使用 "MB_CLIENT" 指令来建立连接，发送 Modbus 请求和接收响应，控制 Modbus/TCP 客户端的连接和断开。
"MB_SERVER" 指令通过一个 PROFINET 连接来作为 Modbus/Tcp 服务器进行通信。"MB_SERVER" 指令响应 Modbus/TCP 客户端的连接请求，接收和处理 Modbus 请求并发送响应信息。
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