当前位置:首页>学习笔记>C# 上位机开发学习笔记『4』- Modbus基础

C# 上位机开发学习笔记『4』- Modbus基础

  • 2026-01-08 13:39:51
C# 上位机开发学习笔记『4』- Modbus基础

Modbus通讯是整个工业领域比较通用的协议, 所以这里采用Modbus协议作为底层的通讯协议

Modbus协议的主要类型分三种

  • Modbus RTU:二进制格式,适用于串行链路(如RS-232、RS-485),效率高。
  • Modbus ASCII:ASCII格式,更易调试,但效率较低。
  • Modbus TCP/IP:基于以太网的版本,支持现代网络,端口502。

这里主要针对Modbus RTU, Modbus TCP大同小异

存储区

按照读写分类可以分为只读和读写, Modbus协议里把只读称作输入, 读写称作输出; 按照数据类型分类, 可分为布尔类型和字类型, Modbus协议中把布尔类型称作线圈, 字类型称作寄存器, 所以排列组合后, Modbus协议有四个存储区

  1. 只读布尔, 称作输入线圈, Discrete Inputs
  2. 只读字, 称作输入寄存器, Input Registers
  3. 读写布尔, 称作输出线圈, Coils
  4. 读写字, 称作保持寄存器, Holding Registers

总结成表格如下

读写属性
数据类型
官方英文名称
常用中文名称
只读
布尔量
Discrete Inputs
离散输入 / 输入线圈
只读
字(16位)
Input Registers
输入寄存器
读写
布尔量
Coils
线圈 / 输出线圈
读写
字(16位)
Holding Registers
保持寄存器

存储区地址及功能码

Modbus协议针对不同的存储区预先定义好了一系列的地址区, 针对读写线圈或者寄存器定义了功能码, 其中写入功能码分别定义了单个写入功能码05, 06和批量写入功能码15, 16, 总结成表格如下

代号
存储区名称(标准英文)
常用中文名称
数据类型
读写属性
常见地址表示示例
对应功能码(读/写)
说明
0x
Coils
输出线圈
布尔(位)
读写
00001 ~ 09999 或 000001 ~ 065535
01(读)、05/15(写)
可读写的输出布尔量(如控制继电器)
1x
Discrete Inputs
输入线圈
布尔(位)
只读
10001 ~ 19999 或 100001 ~ 165535
02(读)
只读的输入布尔量(如开关状态)
3x
Input Registers
输入寄存器
字(16位)
只读
30001 ~ 39999 或 300001 ~ 365535
04(读)
只读的输入值(如传感器测量值)
4x
Holding Registers
保持寄存器
字(16位)
读写
40001 ~ 49999 或 400001 ~ 465535
03(读)、06/16(写)
可读写的参数或数据(如设置值)

报文

Modbus协议针对8个功能码, 对应了8条指令, 分别是

功能码(十进制)
功能码(十六进制)
功能码名称
操作指令描述
针对存储区
读/写
01
0x01
Read Coils
读多个线圈(Coils)
0x(线圈)
02
0x02
Read Discrete Inputs
读多个离散输入(Discrete Inputs)
1x(离散输入)
03
0x03
Read Holding Registers
读多个保持寄存器(Holding Registers)
4x(保持寄存器)
04
0x04
Read Input Registers
读多个输入寄存器(Input Registers)
3x(输入寄存器)
05
0x05
Write Single Coil
写单个线圈(Coil)
0x(线圈)
06
0x06
Write Single Register
写单个保持寄存器(Holding Register)
4x(保持寄存器)
15
0x0F
Write Multiple Coils
写多个线圈(Coils)
0x(线圈)
16
0x10
Write Multiple Registers
写多个保持寄存器(Holding Registers)
4x(保持寄存器)

Modbus协议的报文(Message)采用请求-响应机制,主设备(Master)发送请求报文,从设备(Slave)返回响应报文, 所以针对ModbusRTU会有主站从站之说, 报文基本结构(以Modbus RTU为例):

字段
字节数
说明
从站地址
1
1~247(0为广播)
功能码
1
操作类型
数据区
可变
起始地址、数量、数据等
校验码(CRC)
2
CRC16校验(RTU模式)

其中数据区针对不同的功能码, 结构会有少许区别, 之后在协议开发过程中会针对每一个功能具体说明, 这里先举个例子:

比如针对功能码 01 (0x01):读多个线圈(Read Coils)

请求报文如下

字段
字节数
示例值(十六进制)
说明
从站地址
1
01
功能码
1
01
起始地址高字节
1
00
起始线圈地址(0~65535)
起始地址低字节
1
00
线圈数量高字节
1
00
数量(1~2000)
线圈数量低字节
1
0D
示例:读13个线圈
CRC低字节
1
xx
CRC高字节
1
xx

响应报文如下

字段
字节数
示例值(十六进制)
说明
从站地址
1
01
功能码
1
01
字节计数
1
02
后续数据字节数
线圈状态
N
01 03
每8个线圈占1字节,低位先
CRC低字节
1
xx
CRC高字节
1
xx

补充概念

Modbus中的寄存器的标准大小是一个Word, 一个Word是两个字节, 也就是16个位

Modbus寄存器 = 1 Word = 16 bits = 2 Bytes, 每个寄存器占2字节,高字节在前

当表示浮点数或者32位整数时, 常常会听到大端还是小端, 这是因为浮点数占两个寄存器, 也就是4个字节, 4个字节的排列组合就是所谓的大端排列还是小端排列, 也就是常常在Modbus模拟软件中见到的ABCD或者BADC, 不同的排列得出的浮点数或者整数的结果是不同的, 这点需要注意.

下一节内容: 串口通讯

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  1. CONNECT:[ UseTime:0.001016s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000839s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.078073s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002615s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000592s ]
  6. SELECT * FROM `set` [ RunTime:0.005362s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000596s ]
  8. SELECT * FROM `article` WHERE `id` = 458798 LIMIT 1 [ RunTime:0.001959s ]
  9. UPDATE `article` SET `lasttime` = 1767899270 WHERE `id` = 458798 [ RunTime:0.003154s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.005555s ]
  11. SELECT * FROM `article` WHERE `id` < 458798 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001125s ]
  12. SELECT * FROM `article` WHERE `id` > 458798 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000604s ]
  13. SELECT * FROM `article` WHERE `id` < 458798 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007861s ]
  14. SELECT * FROM `article` WHERE `id` < 458798 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004549s ]
  15. SELECT * FROM `article` WHERE `id` < 458798 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004355s ]
0.225317s