IoTClient开发6

IoTClient开发6

环境和工具

服务端电脑IP：192.168.1.130
客户端电脑IP：192.168.1.120
1、在服务端电脑运行IoTClientTool

2、运行Wireshark

3、在客户端电脑运行IoTClientTool

4、Wireshark得到如下报文

报文分析，plc的连接

我们看到上面连接西门子plc抓取到了八条报文。其中有tcp的三次握手、和对最后一次响应的回复，然后就是西门子特有的两次初始化指令的请求和响应。

两次初始化指令

不同型号的西门子plc有不同的初始化指令，同型号的指令固定不变。

代码实现对plc的连接

//直接是Wireshark抓取到的报文数据var Command1 = new byte[22]{ 0x03,0x00,0x00,0x16,0x11,0xE0,0x00,0x00, 0x00,0x01,0x00,0xC1,0x02,0x10,0x00,0xC2, 0x02,0x03,0x00,0xC0,0x01,0x0A};var Command2 = new byte[25]{ 0x03,0x00,0x00,0x19,0x02,0xF0,0x80,0x32, 0x01,0x00,0x00,0xCC,0xC1,0x00,0x08,0x00, 0x00,0xF0,0x00,0x00,0x01,0x00,0x01,0x03,0xC0};  Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);socket.Connect(new IPEndPoint(IPAddress.Parse(ip), port));//第一次初始化指令交互socket.Send(Command1);var head1 = SocketRead(socket, SiemensConstant.InitHeadLength);SocketRead(socket, GetContentLength(head1));//第二次初始化指令交互socket.Send(Command2);var head2 = SocketRead(socket, SiemensConstant.InitHeadLength);SocketRead(socket, GetContentLength(head2));

对寄存器的读取

我们在客户端电用IoTClientTool读取地址V2634，抓取到包

我们可以看到其中很多都是固定的数据，如版本号、协议id等等。所以，我们可以以此规律获取对应的指令格式

protected byte[] GetReadCommand(byte type, int beginAddress, ushort dbAddress, ushort length){ byte[] command = new byte[31]; command[0] = 0x03; command[1] = 0x00;//[0][1]固定报文头 command[2] = (byte)(command.Length / 256); command[3] = (byte)(command.Length % 256);//[2][3]整个读取请求长度为0x1F= 31  command[4] = 0x02; command[5] = 0xF0; command[6] = 0x80;//COTP command[7] = 0x32;//协议ID command[8] = 0x01;//1 客户端发送命令 3 服务器回复命令 command[9] = 0x00; command[10] = 0x00;//[4]-[10]固定6个字节 command[11] = 0x00; command[12] = 0x01;//[11][12]两个字节，标识序列号，回复报文相同位置和这个完全一样；范围是0~65535 command[13] = 0x00; command[14] = 0x0E;//parameter length（[17]-[30]都为parameter刚好14也就是0x0E） command[15] = 0x00; command[16] = 0x00;//data length command[17] = 0x04;//04读 05写 command[18] = 0x01;//读取数据块个数 command[19] = 0x12;//variable specification command[20] = 0x0A;//Length of following address specification command[21] = 0x10;//Syntax Id: S7ANY  command[22] = 0x02;//Transport size: BYTE  command[23] = (byte)(length / 256); command[24] = (byte)(length % 256);//[23][24]两个字节,访问数据的个数，以byte为单位； command[25] = (byte)(dbAddress / 256); command[26] = (byte)(dbAddress % 256);//[25][26]DB块的编号 command[27] = type;//访问数据块的类型 command[28] = (byte)(beginAddress / 256 / 256); command[29] = (byte)(beginAddress / 256); command[30] = (byte)(beginAddress % 256);//[28][29][30]访问DB块的偏移量 return command;}

读取数据

public Result<byte[]> ReadString(string address, ushort length){ Connect(); var result = new Result<byte[]>();  //发送读取信息 var arg = ConvertArg(address); byte[] command = GetReadCommand(arg.TypeCode, arg.BeginAddress, arg.DbBlock, length); result.Requst = string.Join(" ", command.Select(t => t.ToString("X2"))); var dataPackage = SendPackage(command); byte[] requst = new byte[length]; Array.Copy(dataPackage, 25, requst, 0, length); //Array.Copy(dataPackage, dataPackage.Length - length, requst, 0, length); result.Response = string.Join(" ", dataPackage.Select(t => t.ToString("X2"))); result.Value = requst;  return result;}

对寄存器的写入

我们在客户端电用IoTClientTool对地址V2634写入值666，抓取到包

我们可以以此规律获取对应的指令格式

protected byte[] GetWriteCommand(byte type, int beginAddress, ushort dbAddress, byte[] data){ byte[] command = new byte[35 + data.Length]; command[0] = 0x03; command[1] = 0x00;//[0][1]固定报文头 command[2] = (byte)((35 + data.Length) / 256); command[3] = (byte)((35 + data.Length) % 256);//[2][3]整个读取请求长度 command[4] = 0x02; command[5] = 0xF0; command[6] = 0x80; command[7] = 0x32;//[4]-[7]固定数据 command[8] = 0x01;//1 客户端发送命令 3 服务器回复命令 command[9] = 0x00; command[10] = 0x00; command[11] = 0x00; command[12] = 0x01;//[9]-[12]标识序列号 command[13] = 0x00; command[14] = 0x0E; command[15] = (byte)((4 + data.Length) / 256); command[16] = (byte)((4 + data.Length) % 256);//[15][16]写入长度+4 command[17] = 0x05;//04读 05写 command[18] = 0x01;//写入数据块个数 command[19] = 0x12; command[20] = 0x0A; command[21] = 0x10;//[19]-[21]固定 command[22] = 0x02;//写入方式，1是按位，2是按字 command[23] = (byte)(data.Length / 256); command[24] = (byte)(data.Length % 256);//写入数据个数 command[25] = (byte)(dbAddress / 256); command[26] = (byte)(dbAddress % 256);//DB块的编号 command[27] = type; command[28] = (byte)(beginAddress / 256 / 256 % 256); ; command[29] = (byte)(beginAddress / 256 % 256); command[30] = (byte)(beginAddress % 256);//[28][29][30]访问DB块的偏移量 command[31] = 0x00; command[32] = 0x04;//04 byte(字节) 03bit（位） command[33] = (byte)(data.Length * 8 / 256); command[34] = (byte)(data.Length * 8 % 256);//按位计算出的长度 data.CopyTo(command, 35); return command;}

写入数据

public Result Write(string address, byte[] data){ if (!socket?.Connected ?? true) Connect(); Result result = new Result();  Array.Reverse(data); //发送写入信息 var arg = ConvertArg(address); byte[] command = GetWriteCommand(arg.TypeCode, arg.BeginAddress, arg.DbBlock, data); result.Requst = string.Join(" ", command.Select(t => t.ToString("X2"))); var dataPackage = SendPackage(command); result.Response = string.Join(" ", dataPackage.Select(t => t.ToString("X2"))); return result;}

IoTClient中S7-200SmarTcp协议的使用

安装

Nuget安装 Install-Package IoTClient
或图形化安装

使用

//1、实例化客户端 - 输入正确的IP和端口SiemensClient client = new SiemensClient(SiemensVersion.S7_200Smart, "127.0.0.1",102);//2、写操作client.Write("Q1.3", true);client.Write("V2205", (short)11);client.Write("V2209", 33);//3、读操作var value1 = client.ReadBoolean("Q1.3").Value;var value2 = client.ReadInt16("V2205").Value;var value3 = client.ReadInt32("V2209").Value;//4、如果没有主动Open，则会每次读写操作的时候自动打开自动和关闭连接，这样会使读写效率大大减低。所以建议手动Open和Close。client.Open();//5、读写操作都会返回操作结果对象Resultvar result = client.ReadInt16("V2205");//5.1 读取是否成功（true或false）var isSucceed = result.IsSucceed;//5.2 读取失败的异常信息var errMsg = result.Err;//5.3 读取操作实际发送的请求报文var requst = result.Requst;//5.4 读取操作服务端响应的报文var response = result.Response;//5.5 读取到的值var value3 = result.Value;

结束

• 同步至索引目录：《物联网基础组件IoTClient开发系列》
• 参考: https://m.baidu.com/mip/c/www.360doc.cn/mip/763580999.html
• 完整实现：https://github.com/zhaopeiym/IoTClient