ModBus协议-功能码-0x05

最新推荐文章于 2025-06-12 17:19:20 发布

Andy2019

最新推荐文章于 2025-06-12 17:19:20 发布

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分类专栏： ModBus协议文章标签： ModBus协议功能码

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本文介绍Modbus协议中05功能码WriteSingleCoil的使用方法，包括请求和响应报文的格式及字段含义，如从机地址、功能码、输出地址和输出值等。详细解释了如何通过FF00和0000两种输出值来控制远程设备的输出状态。

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05 (0x05) Write Single Coil
This function code is used to write a single output to either ON or OFF in a remote device.The requested ON/OFF state is specified by a constant in the request data field. A value of FF 00 hex requests the output to be ON. A value of 00 00 requests it to be OFF. All other values are illegal and will not affect the output. The Request PDU specifies the address of the coil to be forced. Coils are addressed starting at zero. Therefore coil numbered 1 is addressed as 0. The requested ON/OFF state is specified by a constant in the Coil Value field. A value of 0XFF00 requests the coil to be ON.A value of 0X0000 requests the coil to be off. All other values are illegal and will not affect the coil.

The normal response is an echo of the request, returned after the coil state has been written.