C#利用S7netplus读写西门子PLC数据

先在NuGet上搜索S7netplus，并安装，如下图所示

搜索s7.net进行安装。

选择VisualStudio2022编程环境。

对s7.net进行引用

连接PLC：

读取PLC数据：

运用myPLC.Read（）方法读取PLC数据

运用   myPLC.Write(）方法写入plc数据

源码分享：

using S7.Net;using System.ComponentModel.DataAnnotations;using System.Diagnostics;using System.Diagnostics.Eventing.Reader;using System.Net;
namespace 西门子S7通讯读取PLC数据{ public partial class Form1 : Form { public Plc myPLC; public bool LJzhuangtia; public S7.Net.DataType dataType; public int sint1,sint2; public Form1(){ InitializeComponent(); IPtextBox.Text = '192.168.0.1'; JTtextBox.Text = '0'; CCtextBox.Text = '1'; } #region class AutoSizeFormClass { public struct controlRect { public int Left; public int Top; public int Width; public int Height; }
public List<controlRect> oldCtrl = new List<controlRect>(); int ctrlNo = 0;
//重要方法一：记录窗体和其控件的初始位置和大小controllInitializeSize() public void controllInitializeSize(Control mForm){ controlRect cR; cR.Left = mForm.Left; cR.Top = mForm.Top; cR.Width = mForm.Width; cR.Height = mForm.Height; oldCtrl.Add(cR); AddControl(mForm); } private void AddControl(Control ctl){ foreach (Control c in ctl.Controls) { controlRect objCtrl; objCtrl.Left = c.Left; objCtrl.Top = c.Top; objCtrl.Width = c.Width; objCtrl.Height = c.Height; oldCtrl.Add(objCtrl); if (c.Controls.Count > 0) AddControl(c); } }
//重要方法二：控件自适应大小方法controlAutoSize() public void controlAutoSize(Control mForm){ if (ctrlNo == 0) { controlRect cR; cR.Left = 0; cR.Top = 0; cR.Width = mForm.PreferredSize.Width; cR.Height = mForm.PreferredSize.Height; oldCtrl.Add(cR); AddControl(mForm); } float wScale = (float)mForm.Width / (float)oldCtrl[0].Width; float hScale = (float)mForm.Height / (float)oldCtrl[0].Height; ctrlNo = 1; AutoScaleControl(mForm, wScale, hScale); } private void AutoScaleControl(Control ctl, float wScale, float hScale){ int ctrLeft0, ctrTop0, ctrWidth0, ctrHeight0; foreach (Control c in ctl.Controls) { ctrLeft0 = oldCtrl[ctrlNo].Left; ctrTop0 = oldCtrl[ctrlNo].Top; ctrWidth0 = oldCtrl[ctrlNo].Width; ctrHeight0 = oldCtrl[ctrlNo].Height;
c.Left = (int)((ctrLeft0) * wScale); c.Top = (int)((ctrTop0) * hScale);// c.Width = (int)(ctrWidth0 * wScale); c.Height = (int)(ctrHeight0 * hScale);// ctrlNo++; if (c.Controls.Count > 0) AutoScaleControl(c, wScale, hScale);
if (ctl is DataGridView) { DataGridView dgv = ctl as DataGridView; Cursor.Current = Cursors.WaitCursor;
int widths = 0; for (int i = 0; i < dgv.Columns.Count; i++) { dgv.AutoResizeColumn(i, DataGridViewAutoSizeColumnMode.AllCells); // 自动调整列宽 widths += dgv.Columns[i].Width; // 计算调整列后单元列的宽度和 } if (widths >= ctl.Size.Width) // 如果调整列的宽度大于设定列宽 dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.DisplayedCells; // 调整列的模式 自动 else dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill; // 如果小于 则填充
Cursor.Current = Cursors.Default; } } } }
//第二步，实例化上面定义的类 AutoSizeFormClass asc = new AutoSizeFormClass();
//第三步，初始化窗口时记录控件的大小和位置 private void Form1_Load(object sender, EventArgs e){ asc.controllInitializeSize(this); }
//第四步，主窗口大小发生变化触发的事件 private void Form1_SizeChanged(object sender, EventArgs e){ asc.controlAutoSize(this); } #endregion
private void button1_Click(object sender, EventArgs e){ if (CPUcomboBox.Text != '') { CpuType cpu = (CpuType)Enum.Parse(typeof(CpuType), CPUcomboBox.Text, true); myPLC = new Plc(cpu, IPtextBox.Text, Convert.ToInt16(JTtextBox.Text), Convert.ToInt16(CCtextBox.Text));


if (LJzhuangtia != true) {
if (CPUcomboBox.Text != '' || IPtextBox.Text != '' || JTtextBox.Text != '' || CCtextBox.Text != '') { NewMethod(); }
else { MessageBox.Show('请填写真确的连接参数！', '提示'); }
} else { MessageBox.Show('请勿重复连接', '提示'); } } else { MessageBox.Show('请先选择PLC！'); } }
private void NewMethod(){ try {

myPLC.Open(); LJzhuangtia = true; MessageBox.Show('连接成功', '提示'); LJBTN.BackColor = Color.Green; DKBTN.BackColor = Color.FromArgb(224, 224, 224);


} catch (Exception) { MessageBox.Show('连接异常，\r\n 请检查线路！ ', '提示'); return; throw; } }
private void DKBTN_Click(object sender, EventArgs e){ if (LJzhuangtia == true) { try { DialogResult dr = MessageBox.Show('确认断开PLC吗？', '提示', MessageBoxButtons.YesNo, MessageBoxIcon.Warning); if (dr == DialogResult.Yes) { LJzhuangtia = false; timer1.Enabled = false; timer2.Enabled = false; myPLC.Close(); LJBTN.BackColor = Color.FromArgb(224, 224, 224);
} } catch (Exception) {
return; throw; } } else { MessageBox.Show('当前没有连接'); } }
private void button3_Click(object sender, EventArgs e){ duqu(); } private void duqu(){ if (LJzhuangtia != false) { try { switch (SHUjucomboBox.Text) { case 'BOOL':
bool num1 = Convert.ToBoolean(myPLC.Read('DB' + DBtextBox.Text + '.' + 'DBX' + addresstextBox.Text)); readshuj.Text += '【' + DateTime.Now + '】' + 'DB' + DBtextBox.Text + '.' + 'DBX' + addresstextBox.Text + '：' + num1.ToString() + '\r\n'; break; case 'BYTE': var num2 = Convert.ToByte(myPLC.Read('DB' + DBtextBox.Text + '.' + 'DBB' + addresstextBox.Text)); int num2_1 = (byte)num2; if (num2_1 > 127) { num2_1 = num2_1 - 256; } readshuj.Text += '【' + DateTime.Now + '】' + 'DB' + DBtextBox.Text + '.' + 'DBB' + addresstextBox.Text + '：' + num2_1.ToString() + '\r\n'; break; case 'READ':
float num3 = ((uint)myPLC.Read('DB' + DBtextBox.Text + '.' + 'DBD' + addresstextBox.Text)).ConvertToFloat(); readshuj.Text += '【' + DateTime.Now + '】' + 'DB' + DBtextBox.Text + '.' + 'DBD' + addresstextBox.Text + '：' + num3.ToString() + '\r\n'; break; case 'INT': int num4 = (ushort)myPLC.Read('DB' + DBtextBox.Text + '.' + 'DBW' + addresstextBox.Text); if (num4 > 32767) { num4 = num4 - 65536; }
readshuj.Text += '【' + DateTime.Now + '】' + 'DB' + DBtextBox.Text + '.' + 'DBW' + addresstextBox.Text + '：' + num4.ToString() + '\r\n'; break; case 'DNIT':
var num5 = (uint)(myPLC.Read('DB' + DBtextBox.Text + '.' + 'DBD' + addresstextBox.Text)); readshuj.Text += '【' + DateTime.Now + '】' + 'DB' + DBtextBox.Text + '.' + 'DBD' + addresstextBox.Text + '：' + num5.ToString() + '\r\n'; break; case 'WORD': var num6 = (ushort)myPLC.Read('DB' + DBtextBox.Text + '.' + 'DBW' + addresstextBox.Text); if (num6 > 32767) { num6 = (ushort)(num6 - 65536); } readshuj.Text += '【' + DateTime.Now + '】' + 'DB' + DBtextBox.Text + '.' + 'DBW' + addresstextBox.Text + '：' + num6.ToString() + '\r\n';
break; case 'DWORD': var num7 = (uint)myPLC.Read('DB' + DBtextBox.Text + '.' + 'DBD' + addresstextBox.Text); readshuj.Text += '【' + DateTime.Now + '】' + 'DB' + DBtextBox.Text + '.' + 'DBD' + addresstextBox.Text + '：' + num7.ToString() + '\r\n'; break; case 'STRING': //S7String读取 byte[] bytes = myPLC.ReadBytes(dataType, 1, 18, 40);
break; case 'PLCNUMBER': PLCdu(); break; }
} catch (Exception) {
return; } } else { MessageBox.Show('请先连接PLC', '提示'); } }
private void PLCdu(){ if (sint1 == 1) { bool num9 = Convert.ToBoolean(myPLC.Read(PLCcomboBox.Text + addresstextBox.Text)); readshuj.Text += '【' + DateTime.Now + '】' + PLCcomboBox.Text + addresstextBox.Text + '：' + num9.ToString() + '\r\n'; } if (sint1 == 2) { var num10 = Convert.ToByte(myPLC.Read(PLCcomboBox.Text + addresstextBox.Text)); int num10_1 = (byte)num10; if (num10_1 > 127) { num10_1 = num10_1 - 256; } readshuj.Text += '【' + DateTime.Now + '】' + PLCcomboBox.Text + addresstextBox.Text + '：' + num10_1.ToString() + '\r\n'; } if (sint1 == 3) { var num11 = (ushort)myPLC.Read(PLCcomboBox.Text + addresstextBox.Text); if (num11 > 32767) { num11 = (ushort)(num11 - 65536); } readshuj.Text += '【' + DateTime.Now + '】' + PLCcomboBox.Text + addresstextBox.Text + '：' + num11.ToString() + '\r\n'; }
}
private void PLCcomboBox_SelectedIndexChanged(object sender, EventArgs e){ switch (PLCcomboBox.Text) { case 'I': sint1 = 1; break; case 'Q': sint1 = 1; break; case 'M': sint1 = 1; break; case 'IB': sint1 = 2; break; case 'QB': sint1 = 2; break; case 'MB': sint1 = 2; break; case 'IW': sint1 = 3; break; case 'QW': sint1 = 3; break; case 'MW': sint1 = 3; break; } }

bool a = false; private void button4_Click(object sender, EventArgs e){ try { if (a != true&&LJzhuangtia==true) { timer1.Enabled = true; button4.Text = '读取中…'; a = true; } else { timer1.Enabled = false; a = false; button4.Text = '连续读取'; } } catch (Exception) {
throw; }



}
private void timer1_Tick(object sender, EventArgs e){ duqu(); }
private void readshuj_TextChanged(object sender, EventArgs e){ readshuj.SelectionStart = readshuj.Text.Length;
readshuj.ScrollToCaret(); }
private void button5_Click(object sender, EventArgs e){ readshuj.Text = string.Empty; }
private void SHUjucomboBox_SelectedIndexChanged(object sender, EventArgs e){ if (SHUjucomboBox.Text == 'PLCNUMBER') { PLCcomboBox.Visible = true; NUMBERlabe6.Text = '数据类型：'; } else { PLCcomboBox.Visible = false; NUMBERlabe6.Text = 'DB号：'; } }


private void button6_Click(object sender, EventArgs e){ xieru(); } private void xieru(){ if (LJzhuangtia != false) { try { switch (WirtcomboBox.Text) { case 'BOOL': myPLC.Write('DB' + WDBtextBox.Text + '.DBX' + WADDtextBox.Text, Convert.ToBoolean( BoolcomboBox.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + 'DB' + WDBtextBox.Text +'.DBX'+ WADDtextBox.Text + '写入:' + BoolcomboBox.Text+'\r\n'; break; case 'BYTE': myPLC.Write('DB' + WDBtextBox.Text + '.DBB' + WADDtextBox.Text, Convert.ToByte(wirtnumber.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + 'DB' + WDBtextBox.Text + '.DBB' + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n'; break; case 'READ': //float numuint = (Convert.ToUInt32( wirtnumber.Text)).ConvertToFloat(); float numfloat = (float)Convert.ToDouble(wirtnumber.Text); myPLC.Write('DB' + WDBtextBox.Text + '.DBD' + WADDtextBox.Text, numfloat); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + 'DB' + WDBtextBox.Text + '.DBD' + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n';
break; case 'INT': myPLC.Write('DB' + WDBtextBox.Text + '.DBW' + WADDtextBox.Text, Convert.ToInt16(wirtnumber.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + 'DB' + WDBtextBox.Text + '.DBW' + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n'; break; case 'DNIT': myPLC.Write('DB' + WDBtextBox.Text + '.DBD' + WADDtextBox.Text, Convert.ToInt32(wirtnumber.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + 'DB' + WDBtextBox.Text + '.DBD' + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n';
break; case 'WORD': myPLC.Write('DB' + WDBtextBox.Text + '.DBW' + WADDtextBox.Text, Convert.ToInt16(wirtnumber.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + 'DB' + WDBtextBox.Text + '.DBW' + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n'; break; case 'DWORD': myPLC.Write('DB' + WDBtextBox.Text + '.DBD' + WADDtextBox.Text, Convert.ToInt32(wirtnumber.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + 'DB' + WDBtextBox.Text + '.DBD' + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n'; break; case 'STRING': //S7String读取
break; case 'PLCNUMBER': PLCwirt(); break; }
} catch (Exception) {
return; } } else { MessageBox.Show('请先连接PLC', '提示'); }
}
private void PLCwirt(){ if (sint2 == 1) { myPLC.Write(PLCwitbox.Text+ WADDtextBox.Text, Convert.ToBoolean(BoolcomboBox.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + PLCwitbox.Text + WADDtextBox.Text + '写入:' + BoolcomboBox.Text + '\r\n'; } if (sint2== 2) { myPLC.Write(PLCwitbox.Text + WADDtextBox.Text, Convert.ToByte(wirtnumber.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + PLCwitbox.Text + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n'; } if (sint2 == 3) { myPLC.Write(PLCwitbox.Text + WADDtextBox.Text, Convert.ToInt16(wirtnumber.Text)); WirtrichTextBo.Text += '【' + DateTime.Now + '】' + PLCwitbox.Text + WADDtextBox.Text + '写入:' + wirtnumber.Text + '\r\n'; } } private void WDBtextBox_KeyPress(object sender, KeyPressEventArgs e){ }
private void WirtcomboBox_SelectedIndexChanged(object sender, EventArgs e){ if(WirtcomboBox.Text=='BOOL') { BoolcomboBox.Visible = true; wirtnumber.Visible= false; } else { BoolcomboBox.Visible = false; wirtnumber.Visible = true; } if(WirtcomboBox.Text == 'PLCNUMBER') { PLCwitbox.Visible = true; } else { PLCwitbox.Visible = false; } }

private void PLCwitbox_SelectedIndexChanged_1(object sender, EventArgs e){ switch (PLCwitbox.Text) { case 'I': sint2 = 1; break; case 'Q': sint2 = 1; break; case 'M': sint2 = 1; break; case 'IB': sint2 = 2; break; case 'QB': sint2 = 2; break; case 'MB': sint2 = 2; break; case 'IW': sint2 = 3; break; case 'QW': sint2 = 3; break; case 'MW': sint2 = 3; break; } if(sint2==1) { BoolcomboBox.Visible = true; wirtnumber.Visible = false; } else { BoolcomboBox.Visible = false; wirtnumber.Visible = true; } }
private void groupBox5_Enter(object sender, EventArgs e){
} bool b; private void button7_Click(object sender, EventArgs e){ if (b != true&LJzhuangtia==true) { timer2.Enabled = true; button7.Text = '写入中…'; b = true; } else { timer2.Enabled = false; b = false; button7.Text = '连续写入'; } }
private void timer2_Tick(object sender, EventArgs e){ xieru(); }
private void button8_Click(object sender, EventArgs e){ WirtrichTextBo.Text = ''; }
private void WirtrichTextBo_TextChanged(object sender, EventArgs e){ WirtrichTextBo.SelectionStart = WirtrichTextBo.Text.Length;
WirtrichTextBo.ScrollToCaret(); } }}