实例介绍
【实例简介】C#直接与PLC通讯无需OPC软件
【实例截图】
【核心代码】
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Threading;
namespace PLCDEMO
{
/// <summary>
/// PLC软元件的类型
/// </summary>
public enum SoftElement
{
/// <summary>
/// X元件
/// </summary>
X = 0,
/// <summary>
/// 元件
/// </summary>
Y,
/// <summary>
/// M元件
/// </summary>
M,
/// <summary>
/// D元件
/// </summary>
D
};
public partial class Form1 : Form
{
private TcpClient m_client= new TcpClient();
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
m_client.SendBufferSize = 4096;
m_client.SendTimeout = 10000;
m_client.ReceiveTimeout = 10000;
m_client.ReceiveBufferSize = 4096;
string m_strIP = textBox3.Text.ToString();
int m_nPort = Convert.ToInt32( textBox4.Text);
m_client.BeginConnect(m_strIP, m_nPort, new AsyncCallback(CallBackMethod), m_client);
Thread.Sleep(5);
}
/// <summary>
///网口打开时通过回调检测是否连接超时
/// </summary>
/// <param name="asyncResult"></param>
private static void CallBackMethod(IAsyncResult asyncResult)
{
try
{
TcpClient tcpClient = asyncResult.AsyncState as TcpClient;
if (tcpClient.Client != null)
{
tcpClient.EndConnect(asyncResult);
}
}
catch
{
}
}
/// <summary>
///向网口写入数据
/// </summary>
/// <param name="sendBytes"></param>
/// <param name="nLen"></param>
/// <returns></returns>
public bool WriteData(byte[] sendBytes, int nLen)
{
if (m_client.Connected)
{
NetworkStream netStream = m_client.GetStream();
if (netStream.CanWrite)
{
netStream.Write(sendBytes, 0, nLen);
}
return true;
}
return false;
}
/// <summary>
///从网口读取数据
/// </summary>
/// <param name="bytes"></param>
/// <param name="nLen"></param>
/// <returns></returns>
public int ReadData(byte[] bytes, int nLen)
{
int n = 0;
if (m_client.Connected)
{
try
{
NetworkStream netStream = m_client.GetStream();
if (netStream.DataAvailable)
{
n = netStream.Read(bytes, 0, nLen);
}
}
catch/*(TimeoutException e)*/
{
}
}
return n;
}
/// <summary>
///关闭网口
/// </summary>
public void Closem_client()
{
if (m_client != null)
{
if (m_client.Connected)
{
NetworkStream netStream = m_client.GetStream();
netStream.Close();
}
m_client.Close();
m_client = null;
}
}
private void button2_Click(object sender, EventArgs e)
{
Closem_client();
}
private void button3_Click(object sender, EventArgs e)
{
UInt16[] aa = new UInt16[] { };
ReadMultiWord(SoftElement.D, 100, aa);
textBox2.Text = aa[0].ToString();
}
/// <summary>
/// 读取多个字元件
/// </summary>
/// <param name="element">元件类型：X、Y、M、D </param>
/// <param name="nAddr">元件起始地址</param>
/// <param name="nValues">保存元件值</param>
/// <returns></returns>
public bool ReadMultiWord(SoftElement element, int nAddr, UInt16[] nValues)
{
string line = "RDS ";
line = element.ToString();
line = nAddr.ToString();
line = ".U";
line = " ";
line = nValues.Length.ToString();
line = "\r";
byte[] cmdData = Encoding.ASCII.GetBytes(line);
if (!WriteData(cmdData, cmdData.Length))
return false;
byte[] rspData = new byte[nValues.Length * 6 1];
if (ReadData(rspData, rspData.Length) != rspData.Length)
return false;
string rspStr = Encoding.ASCII.GetString(rspData);
if (rspStr.Substring(rspStr.Length - 2, 2) != "\r\n")
return false;
string[] strVals = rspStr.Split(' ');
if (strVals.Length != nValues.Length)
return false;
for (int i = 0; i < nValues.Length; i )
{
int nTemp = 0;
if (int.TryParse(strVals[i], out nTemp))
{
nValues[i] = (UInt16)nTemp;
}
else
{
return false;
}
}
return true;
}
/// <summary>
/// <summary>
/// 写入多个元件
/// </summary>
/// <param name="element"></param>
/// <param name="nAddr"></param>
/// <param name="nValues"></param>
/// <returns></returns>
public bool WriteMultiWord(SoftElement element, int nAddr, UInt16[] nValues)
{
string line = "WRS ";
line = element.ToString();
line = nAddr.ToString();
line = ".U";
line = " ";
line = nValues.Length.ToString();
for (int i = 0; i < nValues.Length; i )
{
line = " ";
line = nValues[i].ToString();
}
line = "\r";
byte[] cmdData = Encoding.ASCII.GetBytes(line);
if (!WriteData(cmdData, cmdData.Length))
return false;
byte[] rspData = new byte[4];
if (ReadData(rspData, rspData.Length) != rspData.Length)
return false;
byte[] rspRightData = Encoding.ASCII.GetBytes("OK\r\n");
for (int i = 0; i < rspData.Length; i )
{
if (rspData[i] != rspRightData[i])
return false;
}
return true;
}
private void button4_Click(object sender, EventArgs e)
{
UInt16[] aa=new UInt16[] { };
aa[0] = Convert.ToUInt16( textBox1.Text);//要写入的值,用户自定义
WriteMultiWord(SoftElement.D, 100, aa);
}
private void Form1_Load(object sender, EventArgs e)
{
}
}
}
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