这个春节DeepSeek太火爆了，火爆到同学聚会时他就是其中一个讨论了很长时间的话题，年初五的晚上正好有时间就打算尝试一下，可能是太火爆了，用的人太多了，折腾了几次均为注册成功，无奈放弃。

今天在研究三菱PLC的通讯协议，想了解一下MELSOFT连接协议的详细内容，通过Bing、Goole都没有找的有价值的信息，突然听到了三大运营商均已接入DeepSeek的新闻，于是再次尝试注册，今天还可以，注册成功了，于是有了下面的对话：

MELSOFT协议报文格式

问：MELSOFT协议报文格式

MELSOFT协议是三菱电机（Mitsubishi Electric）为其PLC（可编程逻辑控制器）和自动化设备开发的一种通信协议。该协议用于实现上位机（如PC或HMI）与三菱PLC之间的数据交换和控制。MELSOFT协议的报文格式通常包括以下几个部分：

1.报文头（Header）

• 起始字符：通常是一个固定的字符或字节序列，用于标识报文的开始。
• 长度字段：指示整个报文的长度，包括报文头和报文体。
• 命令码：指示报文的类型或功能，例如读取、写入、控制等。

2.地址字段（Address Field）

• 设备类型：指定要访问的PLC内部设备类型，如X（输入）、Y（输出）、M（内部继电器）、D（数据寄存器）等。
• 起始地址：指定要访问的设备的起始地址。
• 数据长度：指定要读取或写入的数据长度。

3.数据字段（Data Field）

• 数据内容：包含要写入PLC的数据或从PLC读取的数据。数据格式可以是二进制、十六进制、ASCII等，具体取决于协议版本和配置。

4.校验字段（Checksum Field）

• 校验和：用于验证报文的完整性和正确性。常见的校验方式包括CRC（循环冗余校验）、LRC（纵向冗余校验）等。

5.报文尾（Footer）

• 结束字符：通常是一个固定的字符或字节序列，用于标识报文的结束。

示例报文格式

以下是一个简化的MELSOFT协议报文格式示例：

| 报文头 | 地址字段 | 数据字段 | 校验字段 | 报文尾 |
|--------|----------|----------|----------|--------|
| 起始字符 | 设备类型 | 数据内容 | 校验和   | 结束字符 |
| 长度字段 | 起始地址 |          |          |        |
| 命令码   | 数据长度 |          |          |        |

具体示例

假设要读取PLC的D100到D105寄存器的数据，报文可能如下：

| 报文头 | 地址字段 | 数据字段 | 校验字段 | 报文尾 |
|--------|----------|----------|----------|--------|
| STX    | D100     |          | CRC      | ETX    |
| 长度   | 6        |          |          |        |
| 读命令 |          |          |          |        |

注意事项

• 协议版本：不同型号的PLC和不同版本的MELSOFT协议可能在报文格式上有所差异。
• 通信方式：MELSOFT协议可以通过串口（RS232/RS485）、以太网（TCP/IP）等多种通信方式实现。
• 工具支持：三菱提供了MELSOFT系列软件（如GX Works2、GX Works3）来配置和调试PLC，这些工具通常内置了MELSOFT协议的实现。

参考文档

• 三菱电机官方文档：详细报文格式和协议说明可以参考三菱电机提供的通信协议手册或编程手册。
• 编程手册：GX Works2/GX Works3的编程手册中通常包含MELSOFT协议的详细说明。

如果你有具体的PLC型号或协议版本，建议查阅相应的技术文档以获取更准确的报文格式信息。

总结的挺有条理性，可是没有实质性的内容，不是我想要的，于是接着继续问，

再问：报文格式 二进制的

MELSOFT协议的二进制报文格式通常用于高效的数据传输，尤其是在通过串口或以太网与三菱PLC通信时。二进制报文格式比ASCII格式更紧凑，适合对性能要求较高的场景。以下是MELSOFT协议二进制报文格式的详细说明：

MELSOFT二进制报文的基本结构

二进制报文通常由以下几个部分组成：

1. 报文头（Header）
2. 命令码（Command Code）
3. 子命令码（Subcommand Code）
4. 地址字段（Address Field）
5. 数据字段（Data Field）
6. 校验字段（Checksum）
7. 报文尾（Footer）

二进制报文格式详解

1.报文头（Header）

• 起始字符（Start Code）：通常为固定的二进制值，例如 0x50（表示请求）或 0xD0（表示响应）。
• 长度字段（Length Field）：指示整个报文的长度（包括报文头、报文体和校验字段），通常为2字节。

2.命令码（Command Code）

• 指示报文的操作类型，例如：
• 0x0401：读取数据
• 0x1401：写入数据
• 0x0801：控制命令（如PLC启动、停止）
• 命令码通常为2字节。

3.子命令码（Subcommand Code）

• 进一步细化命令操作，例如：
• 0x0000：默认子命令
• 0x0001：批量读取
• 0x0002：随机读取
• 子命令码通常为2字节。

4.地址字段（Address Field）

• 设备类型（Device Type）：指定要访问的PLC内部设备类型，例如：
• 0x90：X（输入）
• 0x91：Y（输出）
• 0xA8：D（数据寄存器）
• 0x9C：M（内部继电器）
• 起始地址（Start Address）：指定要访问的设备的起始地址，通常为3字节。
• 数据长度（Data Length）：指定要读取或写入的数据长度，通常为2字节。

5.数据字段（Data Field）

• 对于写操作：包含要写入PLC的数据。
• 对于读操作：通常为空，PLC会在响应报文中返回数据。
• 数据格式为二进制，长度由地址字段中的“数据长度”决定。

6.校验字段（Checksum）

• 用于验证报文的完整性，常见的校验方式包括：
• CRC校验：2字节，基于CRC-16算法。
• LRC校验：1字节，基于纵向冗余校验。
• 校验范围通常从报文头到数据字段。

7.报文尾（Footer）

• 结束字符（End Code）：通常为固定的二进制值，例如 0x03（ETX）。

二进制报文示例

示例1：读取D100到D105寄存器的数据（6个字）

• 设备类型：D寄存器（0xA8）
• 起始地址：D100（0x000064）
• 数据长度：6个字（0x0006）

请求报文：

50 00 00 1E 00 00 04 01 00 00 A8 00 00 64 00 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

从给出的报文看，这么长，在停止的时候出现一个“继续生产”的按钮，我点了一下，又开始无休止的输出了，我知道这个答案还是错误的，不打算再继续下去了，估计还是会一本正经的胡说八道，不可否认DeepSeek有其独到之处，单从我的初次尝试来看，似乎还不可用，远没有新闻报道里鼓吹的那么神。但愿AI很快速发展，在很多邻域发挥作用。

他可能会一直这样不断输出下去

Tags：subcommand